CN1246736A - Nonaqueous electrolytic secondary battery and manufacture method thereof - Google Patents

Nonaqueous electrolytic secondary battery and manufacture method thereof Download PDF

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Publication number
CN1246736A
CN1246736A CN99118335A CN99118335A CN1246736A CN 1246736 A CN1246736 A CN 1246736A CN 99118335 A CN99118335 A CN 99118335A CN 99118335 A CN99118335 A CN 99118335A CN 1246736 A CN1246736 A CN 1246736A
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electrode group
nonaqueous electrolytic
electrolytic solution
dividing plate
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CN1132261C (en
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高见则雄
长谷部裕之
大崎隆久
神田基
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Toshiba Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The present invention aims to provide a nonaqueous electrolyte secondary battery capable of enhancing capacity, heavy current characteristics and cycle characteristics and forming a thin shape, by impregnating a nonaqueous electrolyte in a group of electrodes in a solution or liquid state. The solution includes a positive electrode, a negative electrode, and a separator between the aforementioned positive and aforementioned negative electrodes, and a nonaqueous electrolyte, characterized in that maintain at least an adhesive polymer with the same composition in each of the gaps of the aforementioned positive electrode, negative electrode and separator respectively, and then they are followed by the aforementioned positive electrode, negative electrode and separator.

Description

Nonaqueous electrolytic solution secondary battery and manufacture method thereof
The present invention relates to the manufacture method of nonaqueous electrolytic solution secondary battery and nonaqueous electrolytic solution secondary battery.
Now, the thin lithium ion secondary cell is as the nonaqueous electrolytic solution secondary battery commercialization of portable sets such as mobile phone use.This battery, the anodal lithium and cobalt oxides (LiCoO that uses 2), negative pole uses graphite material or carbonaceous material, and electrolyte uses the organic solvent that is dissolved with lithium salts, and dividing plate uses perforated membrane.
Along with the slimming of portable set, people wish the reduced thickness with battery, are difficult to practicability but thickness is lower than 4 millimeters thin lithium ion secondary cell.Therefore, the past has the people to propose a kind of card-type lithium rechargeable battery that uses polymer dielectric, and sets about carrying out the practicability exploitation.
Yet, in the lithium secondary battery that uses polymer dielectric, because polymer is the gelatinous polymer that remains in the nonaqueous electrolytic solution, so compare with the lithium secondary battery that uses nonaqueous electrolytic solution, the impedance height that has electrode interface, and the low problem of lithium ion conducting rate.In addition, in order to improve the mobility of lithium ion, in case the quantity of active material of both positive and negative polarity is reduced reduced thickness, thereby the problem that reduces of produce power density.
Therefore, use the lithium secondary battery of polymer dielectric, compare, have the shortcoming of volume energy density and large current characteristic inequality with the slim lithium secondary battery of impregnation nonaqueous electrolytic solution under the solution liquid condition.
In addition, the spy opens in the claim of flat 10-177865 communique, has put down in writing a kind of lithium rechargeable battery.This battery by positive pole, negative pole, have the dividing plate of possessing electrolyte and opposite face, the high-molecular gel that contains electrolysis liquid phase and electrolyte mutually and the mixed phase of macromolecule solid phase form, and on the opposite face of aforementioned barriers, have the adhesive resin layer of bonding positive pole and negative pole.Open in the claim of flat 10-189054 communique the spy, put down in writing a kind of manufacture method of lithium rechargeable battery, this method has the operation of each electrode of formation that is shaped on the collector body of anodal and negative pole, coating is dissolved in main composition polyvinylidene fluoride the operation of the binder resin solution that forms in the solvent on dividing plate, overlapping above-mentioned various electrodes on this dividing plate, make it to form the operation of stacked battery at bonding down dry evaporating solvent, and the operation that makes this stacked battery impregnation electrolyte.
Yet, in these lithium rechargeable batteries, because between positive pole and the dividing plate, and have the adhesive resin layer respectively between multiple agent and the dividing plate, so cause internal resistance to improve deteriorations such as cycle life and heavy-current discharge characteristic.
The object of the invention is to provide a kind of like this nonaqueous electrolytic solution secondary battery, makes the non-aqueous secondary batteries of electrode group impregnation nonaqueous electrolytic solution under the solution liquid condition, can slimming, and can improve its capacity, large current characteristic and cycle characteristics.
The object of the invention also is to provide a kind of manufacture method of nonaqueous electrolytic solution secondary battery, this method is for the non-aqueous secondary batteries of electrode group impregnation nonaqueous electrolytic solution under the solution liquid condition, can make it slimming with plain mode, and can improve its capacity, large current characteristic and cycle characteristics.
The present invention relates to a kind of nonaqueous electrolytic solution secondary battery, this battery has positive pole, negative pole, is arranged on the electrode group of the dividing plate between said positive pole and the said negative pole, and nonaqueous electrolytic solution, it is characterized in that in the hole of said positive pole, said negative pole and said dividing plate, all possessing at least the cementability macromolecule, with said positive pole, said negative pole with said dividing plate is bonding is integral.
In addition, the invention still further relates to a kind of manufacture method of nonaqueous electrolytic solution secondary battery, it is characterized in that having following operation:
Dividing plate is arranged on the operation of making the electrode group between positive pole and the negative pole,
Make the operation of the solution that said electrode group impregnation cementability macromolecule is melt into,
With said electrode group drying, forming process, and
Make the operation of said electrode group impregnation nonaqueous electrolytic solution.
In addition, the present invention also provides a kind of nonaqueous electrolytic solution secondary battery, wherein has the electrode group of being with positive pole, negative pole, being arranged on the dividing plate between said positive pole and the said negative pole, and nonaqueous electrolytic solution, it is characterized in that in the hole of said positive pole, said negative pole and said dividing plate, possessing respectively at least the cementability macromolecule, with said positive pole, said negative pole with said dividing plate is bonding is integral, and said electrode group is coiled positive pole, negative pole and dividing plate or crooked forming.
The following detailed description in detail with reference to accompanying drawing 1, accompanying drawing 2, accompanying drawing 4 and accompanying drawing 5 belongs to non-aqueous secondary batteries (for example thin lithium ion secondary cell) of the present invention.
Accompanying drawing 1 expression belongs to the sectional view of nonaqueous electrolytic solution secondary battery of the present invention (for example thin lithium ion secondary cell), the zoomed-in view of A part in the accompanying drawing 2 expression accompanying drawings 1, the ideograph of the anodal layer of accompanying drawing 3 expressions, dividing plate and negative electrode layer boundary vicinity.Accompanying drawing 4 expressions have the axis side view of positive pole, negative pole and dividing plate being coiled the nonaqueous electrolytic solution secondary battery that forms structure.
Accompanying drawing 5 expressions have positive pole, negative pole and dividing plate is coiled or the crooked axis side view that forms the nonaqueous electrolytic solution secondary battery of structure.
As shown in Figure 1, the housing material of for example being made up of the stacked film material 1 surrounds electrode group 2.Above-mentioned electrode group 2 has and will be coiled into the structure of flat pattern by positive pole, dividing plate and the sandwich that negative pole is formed.Above-mentioned sandwich, as shown in Figure 2, the sequential cascade according to dividing plate 3, anodal layer 4, positive electrode collector 5, anodal layer 4, dividing plate 3, negative electrode layer 6, negative electrode collector 7, negative electrode layer 6, dividing plate 3, anodal layer 4, positive electrode collector 5, anodal layer 4, dividing plate 3, negative electrode layer 6 and negative electrode collector 7 forms.Above-mentioned electrode group 2 is above-mentioned negative electrode collector 7 at outermost layer.Bonding portion 8 is arranged on the surface of above-mentioned electrode group 2.The inner surface of above-mentioned housing material 1 is bonded on the above-mentioned bonding portion 8.As shown in Figure 3, in all scopes of electrode group 2, in the hole of anodal layer 4, dividing plate 3 and negative electrode layer 6, all possess cementability macromolecular material 9.Make the electrode group form one and fix by means of macromolecular material 9.Anodal layer, dividing plate and negative electrode layer preferably all use the cementability macromolecular material of same composition.Utilize this material can make the electrode group form one more firmly.Nonaqueous electrolytic solution contains among the above-mentioned electrode group 2 that is immersed in the above-mentioned housing material 1.Banded positive wire 10, one ends are connected on the above-mentioned positive electrode collector 5 of above-mentioned electrode group 2, and the other end is drawn in above-mentioned housing material 1.In addition, banded negative wire 11, one ends are connected on the above-mentioned negative electrode collector 7 of above-mentioned electrode group 2, and the other end is drawn in above-mentioned housing material 1.
Nonaqueous electrolytic solution secondary battery of the present invention as shown in Figure 4, can use the electrode group of the duplexer of one group of positive pole 41, negative pole 43 and dividing plate 42 being coiled formation.Perhaps, as shown in Figure 5, also can use duplexer to be bent to form the electrode group with one group of positive pole 51, negative pole 53 and dividing plate 52.Adopt the easier manufacturing electrode of this method group, and can obtain the stronger electrode group of mechanical strength.The area of negative pole 43 is preferably greater than anodal 41 area.Utilize this mode that negative pole end is stretched out from positive terminal, can suppress electric current and concentrate, improve cycle characteristics and fail safe again to negative pole end.
Preferably make the minor face of dividing plate respectively stretch out 0.25～2mm, and existence belong to cementability macromolecule of the present invention on extended partition part from the minor face of negative pole band electrode.So, the intensity enhancing of dividing plate extension also is difficult to produce short circuit even battery applied to impact between positive pole and the negative pole.In addition, also be difficult to produce shrink, can prevent short circuit between positive pole and the negative pole and fail safe is improved even battery is in high temperature (more than 100 ℃) lower clapboard.
Below be elaborated with regard to above-mentioned positive pole, above-mentioned negative pole, aforementioned barriers 3, above-mentioned adhesive linkage 8, above-mentioned cementability macromolecule 9, above-mentioned nonaqueous electrolytic solution and above-mentioned housing material 1.
1) positive pole
This just having a structure that on the one or both sides of collector body 5 carrier band contains the anodal layer 4 of active material.The macromolecule 9 of possessing cementability in the hole of above-mentioned positive pole.
Above-mentioned positive pole contains positive active material and conductive agent.And above-mentioned positive pole, also can contain macromolecule 9 bonding agents different, that be bonded with positive active material with cementability.
As above-mentioned positive active material, can enumerate for example chalcogen compounds such as manganese dioxide, complex Li-Mn-oxide, the cobalt compound that contains lithium, the nickel cobalt oxide that contains lithium, the ferriferous oxide that contains lithium, the barium oxide that contains lithium, titanium disulfide and molybdenum bisuphide.Wherein, if use the cobalt compound contain lithium (LiCoO for example 2), contain the nickel cobalt compound (LiNi for example of lithium 0.8Co 0.2O 2), complex Li-Mn-oxide (LiMn for example 2O 4, LiMnO 2), then can obtain high voltage, thus preferred.
As above-mentioned conductive agent, for example can enumerate acetylene black, carbon black, graphite etc.
Can enumerate for example polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), trimerization ethylene-propylene copolymer (EPDM) and styrene butadiene rubbers (SBR) etc. as above-mentioned bonding agent.
The proportioning of above-mentioned positive active material, conductive agent and bonding agent preferably is in 80～95 weight % positive active materials, 3～20 weight % conductive agents, 2～7 weight % bonding agent scopes.
Can use the conductive board or the atresia conductive board of loose structure as above-mentioned collector body.These conductive boards for example can utilize aluminium, stainless steel or nickel to form.
Per 10 centimetres of wherein preferred use 2There is the two-dimentional loose structure electrically-conductive backing plate of an above diameter on the area less than 3 millimeters holes.That is to say, in the aperture of electrically-conductive backing plate upper shed if greater than 3 millimeters, then anodal undercapacity.Otherwise,,, and can not obtain sufficient cycle life then owing to be difficult to make the electrode group to flood nonaqueous electrolytic solution equably if the ratio that diameter hole below 3 millimeters exists is lower than above-mentioned scope.The preferable range of bore dia is 0.1～1 millimeter.And the proportion that exists of hole, 10～20 holes are arranged on preferred per 10 square centimeters.
Above-mentioned at per 10 centimetres 2There is the electrically-conductive backing plate of an above diameter on the area, thickness is in 15～100 mu m ranges less than the two-dimentional loose structure in 3 millimeters holes.If thickness then can not obtain fully positive pole strength less than 15 μ m, otherwise if thickness is higher than 100 μ m, then the thickness of battery weight and electrode group increases, and is difficult to fully improve the weight energy density and the volume energy density of thin-type secondary battery.Preferred thickness range is 30～80 μ m.
The macromolecule of above-mentioned cementability preferably can be at the material that keeps keeping under the non-aqueous solution electrolysis liquid status high adhesiveness.And such macromolecule is the high material of lithium ion conducting rate preferably.Specifically can enumerate polyacrylonitrile (PAN), polyacrylate (PMMA), polyvinylidene fluoride (PVdF), polyvinyl chloride (PVC) or poly(ethylene oxide) (PEO) etc.Preferred especially polyvinylidene fluoride.Polyvinylidene fluoride can keep nonaqueous electrolytic solution, produces part gelatification when containing nonaqueous electrolytic solution, thereby the ionic conductivity in the positive pole is further improved.
Above-mentioned cementability macromolecule should preferably have the material of loose structure in above-mentioned anodal hole.Cementability macromolecule with loose structure can keep nonaqueous electrolytic solution.
2) negative pole
Above-mentioned negative pole has the structure at the one or both sides carrier band negative electrode layer 6 of collector body 7.And above-mentioned negative electrode layer, except macromolecule 9, also can contain the bonding agent of bonding negative material with cementability.
As above-mentioned carbonaceous material, can enumerate graphite material that (preferred especially mesophase asphalt carbon fibers) such as graphite material such as for example graphite, coke, carbon fiber, spherical carbon element or carbonaceous material, thermosetting resin, isotropic pitch, mesophase pitch, mesophase asphalt carbon fiber, mesophasespherules obtain or carbonaceous material etc. after 500～3000 ℃ of following heat treatment.Wherein preferred the use is set in face that obtain under the temperature more than 2000 ℃, (002) face d at interval with heat treatment temperature 002Be in the graphite that 0.340nm is following, have graphite crystallization.Contain this graphite material as carbonaceous material and have the non-aqueous secondary batteries of negative pole, can significantly improve battery capacity and large current characteristic.More preferably above-mentioned interval d 002Be in the following material of 0.336nm.
Above-mentioned bonding agent can use for example polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), trimerization ethylene-propylene copolymer (EPDM), styrene butadiene rubbers (SBR), carboxymethyl cellulose (CMC) etc.
The ratio range of above-mentioned carbonaceous material and above-mentioned bonding agent, the bonding agent of the carbonaceous material of preferred 90～98 weight % and 2～20 weight %.
Can use the conductive board or the atresia conductive board of loose structure as above-mentioned collector body.These conductive boards for example can use copper, stainless steel or nickel to form.
Per 10 centimetres of wherein preferred use 2There is the two-dimentional loose structure electrically-conductive backing plate of an above diameter on the area less than 3 millimeters holes.That is to say that if the aperture on the electrically-conductive backing plate is greater than 3 millimeters, then the negative pole undercapacity.Otherwise,,, and can not obtain sufficient cycle life then owing to be difficult to make the electrode group to flood nonaqueous electrolytic solution equably if the ratio that exists in diameter hole below 3 millimeters is lower than above-mentioned scope.The diameter in hole preferably is in 0.1～1 millimeter scope.And the hole have a proportion, 10～20 holes are arranged on preferred per 10 square centimeters.
Above-mentioned per 10 centimetres 2Have the electrically-conductive backing plate of an above diameter less than the two-dimentional loose structure in 3 millimeters holes on the area, its preferred thickness range is 10～50 μ m.If thickness less than 10 μ m, then can not get sufficient negative pole intensity, otherwise if thickness is higher than 50 μ m, then the thickness of battery weight and electrode group increases, and is difficult to fully improve the weight energy density and the volume energy density of thin-type secondary battery.
The macromolecule of above-mentioned cementability is preferably at the material that keeps can keeping under the non-aqueous solution electrolysis liquid status high adhesiveness.And such macromolecule is the high material of lithium ion conducting rate preferably.Specifically can enumerate and above-mentioned those materials at the positive pole explanation.Preferred especially polyvinylidene fluoride.
Above-mentioned cementability macromolecule preferably has the material under the loose structure form in above-mentioned negative pole hole.Cementability macromolecule with loose structure can keep nonaqueous electrolytic solution.
As above-mentioned negative pole, contain the carbonaceous material that can adsorb-discharge lithium ion except above-mentioned, can also use the material that contains metal oxide, metal sulfide or metal nitride, perhaps the material of making by lithium metal or lithium alloy.
As above-mentioned metal oxide, can enumerate for example tin-oxide, Si oxide, Li-Ti oxide, niobium oxide, tungsten oxide etc.
As above-mentioned metal sulfide, can enumerate for example tin sulfide, titanium sulfide etc.
As above-mentioned metal nitride, can enumerate for example lithium cobalt nitride, lithium iron-nitride, lithium manganese nitride etc.
As above-mentioned lithium alloy, can enumerate for example lithium-aluminium alloy, lithium-tin alloy, Li-Pb alloy, lithium silicon alloy etc.
3) dividing plate
This dividing plate is to form by possess the cementability polymer substance in the hole of porous sheet.
Above-mentioned porous sheet can use the perforated membrane that for example contains polyethylene, polypropylene or polyvinylidene fluoride, synthetic resin nonwoven fabrics etc.Wherein by polyethylene or polypropylene or the fail safe that can improve secondary cell by the two perforated membrane of making, thus preferred.
Above-mentioned cementability macromolecule should use at the material that keeps can keeping under the non-aqueous solution electrolysis liquid status cementability.And so high material of macromolecule preferred lithium ionic conductivity.Specifically, can enumerate with top at the same material of the explanation of positive pole.Preferred especially polyvinylidene fluoride.
The material that above-mentioned cementability macromolecule preferably exists with the loose structure form in the aforementioned barriers hole.Cementability macromolecule with loose structure can keep nonaqueous electrolytic solution.
The thickness of above-mentioned porousness sheet material preferably is in below the 30 μ m.When thickness surpassed 30 μ m, the distance between the both positive and negative polarity adds ambassador's internal resistance to be increased.And the lower limit of thickness should be set in 5 μ m.When thickness during less than 5 μ m, the intensity of dividing plate obviously reduces, and is easy to generate internal short-circuit.The higher limit of thickness preferably sets at 25 μ m, and lower limit more preferably is set in 10 μ m.
Above-mentioned porous sheet, its 120 ℃ following 1 hour percent thermal shrinkages preferably are in below 20%.If above-mentioned percent thermal shrinkage surpasses 20%, then may be difficult to keep having sufficient adhesion strength between both positive and negative polarity and the dividing plate.Above-mentioned percent thermal shrinkage more preferably is in below 15%.
Above-mentioned porous sheet, its porosity preferably is in 30～60% scopes, the reasons are as follows.If porosity less than 30%, then is difficult to make dividing plate to have high electrolyte retentivity.Otherwise,, then may not obtain enough diaphragm strengths if porosity surpasses 60%.Preferred porosity ranges is 35～50%.
Above-mentioned porous sheet, its air transmission coefficient preferably is in 600 seconds/100cm 3In the scope.When air transmission coefficient surpasses 600 seconds/100cm 3The time, in dividing plate, be difficult to obtain high lithium ion mobility.And the lower limit of air transmission coefficient, preferred 100 seconds/100cm 3If air transmission coefficient is lower than 100 seconds/100cm 3, then can not obtain enough diaphragm strengths.The higher limit of air transmission coefficient, more preferably 500 seconds/100cm 3And the lower limit of air transmission coefficient, more preferably 150 seconds/100cm 3
4) nonaqueous electrolytic solution
Above-mentioned nonaqueous electrolytic solution is to utilize the liquid electrolyte that electrolyte dissolution is made in nonaqueous solvents.
Above-mentioned nonaqueous electrolytic solution can use the solvent as lithium secondary battery to use known nonaqueous solvents, though be not particularly limited the preferred nonaqueous solvents that uses based on a kind of mixed solvent; Said mixed solvent is propylene carbonate (PC) and ethylene carbonate (EC) etc., and above-mentioned PC of ratio of viscosities and EC etc. are low and the donor number less than the mixed solvent between more than one nonaqueous solventss (hereinafter referred to as second kind of solvent) of 18.
Above-mentioned second kind of solvent preference such as linear carbonate wherein can be enumerated dimethyl carbonate (DMC), carbonic acid Methylethyl ester (MEC), carbonic acid diethyl ester (DEC), ethyl propionate, methyl propionate, gamma-butyrolacton (γ-BL), acetonitrile (AN), ethyl acetate (EA), toluene, dimethylbenzene or methyl acetate etc.In these second kind of solvent of enumerating, can be used alone or use two or more mixtures.Particularly preferred second kind of solvent is the donor number less than 16.5 solvent.
The viscosity of above-mentioned second kind of solvent, the value under preferred 25 ℃ is below the 28mp.Allocate the proportioning of above-mentioned ethylene carbonate or propylene carbonate in above-mentioned mixed solvent into, meter preferably is in 10～80% scopes by volume.The more preferably proportioning that above-mentioned ethylene carbonate or propylene carbonate are counted by volume is 20～70%.
The more preferably composition of above-mentioned mixed solvent is by EC and MEC, EC, PC and MEC, and EC, MEC and DEC, EC, MEC and DMC, the mixed solvent that EC, MEC, PC and DEC form, wherein the volume ratio of MEC preferably is in 30～80% scopes.Preferred MEC volume ratio is in 40～70% scopes.
Above-mentioned electrolyte contained in nonaqueous solvents can be enumerated for example lithium perchlorate (LiClO 4), hexafluoro closes lithium phosphate (LIPF 6), LiBF4 (LiBF 4), hexafluoroarsenate lithium (LiAsF 6), trifluoromethanesulfonic acid lithium (LiCF 3SO 3), two fluoroform sulphonyl imino group lithium [LiN (CF 3SO 2) 2] wait lithium salts (electrolyte).Wherein preferred LIPF 6, LiBF 4
The meltage of above-mentioned electrolyte in above-mentioned nonaqueous solvents should be set in 0.5～2.0 mol scope.
The quantity of above-mentioned nonaqueous electrolytic solution preferably sets at 0.2～0.6 gram for every 100mAh battery unit capacity, and it be the reasons are as follows.When nonaqueous electrolytic solution lazy weight 0.2 gram/100mAh, the ionic conductivity deficiency of anodal and multiple negative pole.Otherwise,, then be difficult to membranaceous housing material sealing because of electrolyte quantity increases if not water electrolysis liquid quantity surpasses 0.6 gram/100mAh.The more preferably quantitative range of nonaqueous electrolytic solution is 0.4～0.55 gram/100mAh.
5) bonding portion 8
This bonding portion 8 is present on the surface of above-mentioned electrode group 2, with housing material with the electrode group is bonding is integral.Can reduce the distortion that gas that battery produces causes by means of this bonding portion 8.
Above-mentioned bonding portion can mainly form with the macromolecule with cementability.
Above-mentioned macromolecule with cementability is preferably at the material that keeps can keeping under the non-aqueous solution electrolysis liquid status high adhesiveness.And such macromolecule is the high material of lithium ion conducting rate preferably.Specifically can enumerate with above-mentioned at the identical material of positive pole explanation.Preferred especially polyvinylidene fluoride.
Above-mentioned bonding portion also can have loose structure.The bonding portion of loose structure can keep nonaqueous electrolytic solution in its hole.
The high molecular total amount of contained cementability in the above-mentioned battery preferably is in 0.2～6 nanogram range for every 100mAh battery capacity, and it be the reasons are as follows.For the 100mAh battery capacity, when cementability macromolecule insufficient total amount 0.2 milligram hour, the adherence between positive pole, dividing plate and the multiple negative pole can not fully improve; Otherwise for the 100mAh battery capacity, if cementability macromolecule total amount surpasses 6 milligrams, then the lithium ion conducting rate of secondary cell reduces, and causes that internal resistance raises, and is difficult to improve battery capacity, heavy-current discharge characteristic and charge and discharge circulation life.More preferably scope with macromolecule total amount of cementability is 0.5～3 milligram for the 100mAh battery capacity.
Though be on all surfaces of electrode group 2, to have formed bonding portion 8 in the above-mentioned accompanying drawing 1, also can on the part of electrode group 2, form bonding portion 8.Forming on electrode group 2 parts under the situation of bonding portion 8, forming said bonding portion 8 on preferred suitable with the electrode group outermost at least surface.Can there be bonding portion 8 in addition yet.
6) housing material 1
This housing material 1 can use by having flexible film of synthetic resin or metallic film.Under the situation for battery with nonaqueous electrolyte, especially preferably in the layer that synthetic resin forms, insert the multilayer film that barrier layer such as aluminium forms.By making it to contain aluminium lamination, particularly under the situation of nonaqueous electrolyte, can extend the life of a cell because can prevent moisture content from sneaking in the electrolyte, thereby preferred.
The thickness of above-mentioned housing material preferably is in 50～300 mu m ranges.Cross thin then easy deformation and breakage, blocked up then slimming weak effect.
The manufacture method of nonaqueous electrolytic solution secondary battery of the present invention below is described.(first operation)
Between positive pole and negative pole, insert porous sheet as dividing plate, make the electrode group.
The manufacturing of above-mentioned positive pole is as follows, for example positive active material, conductive agent and bonding agent is suspended in the appropriate solvent, and this suspended matter is coated on the collector body, and shape laminates after the drying.About above-mentioned positive active material, conductive agent, bonding agent and collector body, can enumerate and the identical material of above-mentioned (1) anodal hurdle explanation.
The manufacturing of above-mentioned negative pole is as follows, for example can adsorb the carbonaceous material and the bonding agent that discharge lithium ion and fully knead in the presence of solvent, and the suspended matter that obtains is coated on the collector body, after the drying, pressurizes or 2～5 multistage pressurizations at required pressure next time.
About above-mentioned carbonaceous material, bonding agent and collector body, can enumerate and the identical material of above-mentioned (2) negative pole hurdle explanation.
As the porous sheet of aforementioned barriers, can use with above-mentioned (3) dividing plate hurdle in same material is described.(second operation)
Above-mentioned electrode group is placed in the housing material of processing pouch, lamination surface can be seen from opening portion.Injection at the solution that solvent obtains, makes the above-mentioned solution of above-mentioned electrode group impregnation with the cementability macromolecule dissolution in above-mentioned housing material.
Can enumerate the same material that illustrates with above-mentioned (6) housing material hurdle as housing material.
As macromolecule, can enumerate same material with above-mentioned (1) anodal hurdle explanation with cementability.Preferred especially PVdF.
Above-mentioned solvent should use boiling point at the organic solvent below 200 ℃.Such organic solvent for example can be enumerated dimethyl formamide (153 ℃ of boiling points).The boiling point of organic solvent is in case above 200 ℃, and then when being decided to be vacuumize temperature described later below 100 ℃, prolong drying time.And the lower limit of organic solvent boiling point, preferably set at 50 ℃.The organic solvent boiling point is lower than under 50 ℃ the situation, and above-mentioned organic solvent will volatilize during the electrode group is injected above-mentioned solution.The higher limit of boiling point preferably is set in 180 ℃, and the lower limit of boiling point preferably is set in 100 ℃.
The concentration of cementability macromolecule in above-mentioned solution preferably is in 0.1～2.5 weight % scope, the reasons are as follows.During above-mentioned concentration less than 0.1 weight %, be difficult to obtain enough adhesive strengths between both positive and negative polarity and the dividing plate.Otherwise, be higher than in above-mentioned concentration under the situation of 2.5 weight %, be difficult to obtain keeping as far as possible the vesicularity of nonaqueous electrolytic solution, cause the impedance of electrode interface to enlarge markedly.In a single day interface impedance increases, and capacity and heavy-current discharge characteristic will reduce significantly.Therefore the more preferably scope of concentration is 0.5～1.5 weight %.
The injection rate of above-mentioned solution, the cementability polymer concentration is under the situation in 0.1～2.5 weight % scope in above-mentioned solution, and preferred 0.2～2 milliliter of every 100mAh battery capacity be the reasons are as follows.During 0.2 milliliter of above-mentioned insufficient infusion, the adherence between anodal, negative pole and the dividing plate is difficult to abundant raising.Otherwise above-mentioned injection rate is in case above 2 milliliters, will cause the reduction of lithium ion conducting rate and the internal resistance of secondary cell to be increased, and be difficult to improve discharge capacity, heavy-current discharge characteristic and charge and discharge circulation life.The more preferably scope of above-mentioned injection rate is 0.3～1 milliliter of every 100mAh battery capacity.(the 3rd operation)
Above-mentioned electrode group is forced into predetermined thickness on one side, on one side at normal pressure or comprise under the decompression of vacuum and carry out drying, make the solvent evaporation in the above-mentioned solution, can make the interior maintenance of hole of above-mentioned positive pole, negative pole and dividing plate have the macromolecule of cementability, thereby make the electrode composing type integrated.And, utilize this seasoning, can also be simultaneously with in the above-mentioned electrode group moisture content remove.
Wherein, above-mentioned porousness bonding portion is allowed and is contained trace solvent.
Above-mentioned drying is preferably carried out under 100 ℃ of following temperature, the reasons are as follows.When baking temperature surpassed 100 ℃, aforementioned barriers produced thermal contraction significantly.In case thermal contraction strengthens, make because of dividing plate is crooked be difficult between positive pole, negative pole and the dividing plate bonding firmly.And, contain in use under the situations of porous film as dividing plate such as polyethylene or polypropylene, very easily produce above-mentioned thermal contraction phenomenon.Though baking temperature is low more can suppress more dividing plate the thermal contraction phenomenon, be lower than when baking temperature under 40 ℃ the situation, be difficult to make solvent fully to evaporate.Therefore, baking temperature preferably is in 40～100 ℃ of scopes.And dry being preferably in carried out (the 4th operation) under the decompression that comprises vacuum
After injecting nonaqueous electrolytic solution in the electrode group in being in above-mentioned housing material, seal the opening portion of above-mentioned housing material, make slim nonaqueous electrolytic solution secondary battery.
Above-mentioned nonaqueous electrolytic solution can use and above-mentioned same material.
In above-mentioned manufacture method, inject and to have dissolved this operation of the high molecular solution of cementability, being placed housing material after, the electrode group carries out, carry out implant operation before still also can be in placing housing material.In this case, at first between positive pole and negative pole, insert dividing plate and make the electrode group.After making the above-mentioned solution of above-mentioned electrode group impregnation, above-mentioned electrode group at normal pressure or comprise under the decompression of vacuum and carry out drying, with the solvent evaporation in the above-mentioned solution, is made in the hole of above-mentioned positive pole, negative pole and dividing plate and forms the porousness bonding portion.Place the housing material back to inject nonaqueous electrolytic solution such electrode group, seal then, utilize this method can make slim nonaqueous electrolytic solution secondary battery.
According to manufacture method of the present invention, can make slim nonaqueous solvent secondary battery with structure shown in above-mentioned accompanying drawing 1,2 or the accompanying drawing 3,4.
Nonaqueous electrolytic solution secondary battery of the present invention according to above explanation, because can be at least in the hole that anodal and dividing plate are surrounded, in the hole that negative pole and dividing plate surrounded and in the space separately in both positive and negative polarity and the dividing plate maintenance have the macromolecule of cementability, so can make electrode group inside be distributed with three-dimensional netted cementability macromolecule at least.Its result, the one side of dividing plate directly contacts with positive pole, and another side directly contacts with negative pole, makes positive pole, negative pole and dividing plate integrated, even so use under the situation of membranaceous housing material, polydivinylbenezene can guarantee enough adaptations between both positive and negative polarity and the dividing plate.The internal resistance that can also suppress simultaneously to produce because of the cementability macromolecule is risen.Therefore can provide the nonaqueous electrolytic solution secondary battery that large current characteristic and cycle life all are improved.In addition, owing to can also use membranaceous housing material, for example only be below 4 millimeters so can produce thickness, the slim nonaqueous electrolytic solution secondary battery that capacity, heavy-current discharge characteristic and cycle life are all good.
Use under the situation of above-mentioned membranaceous housing material, in above-mentioned electrode group surface, form bonding portion on suitable with the most peripheral at least surface, above-mentioned housing material can be fixed on the above-mentioned electrode group like this.So, in above-mentioned secondary cell, owing to for example can suppress inferior because of making charging and discharging state remain on high-temperature atmosphere, so nonaqueous electrolytic solution oxidation Decomposition and the dilatancy phenomenon of above-mentioned electrode group when producing carbon dioxide are the damage that above-mentioned secondary cell causes electronic equipment can prevent that gas from producing the time.
Be equivalent to reduce internal resistance in every 100mAh battery capacity 0.2～6 nanogram range by having a high molecular total amount of cementability with above-mentioned, being controlled at, further improve the adherence between anodal, negative pole and the dividing plate.The result can improve the large current characteristic and the cycle life of above-mentioned secondary cell.
When aforementioned barriers thickness is in 30 μ m when following, owing to can further reduce the internal resistance of above-mentioned secondary cell, so can further improve the large current characteristic and the cycle life of above-mentioned secondary cell.
And, be in below 20% at 120 ℃ of following percent thermal shrinkages of 1 hour by making aforementioned barriers, the adherence of positive pole, negative pole and dividing plate is further improved, so the large current characteristic of above-mentioned secondary cell and cycle life are able to further raising.
In addition, utilize porosity with aforementioned barriers to be controlled at 30～60% method, can satisfy simultaneously to diaphragm strength with to the two aspect requirements of electrolyte retentivity, so the large current characteristic of above-mentioned secondary cell and cycle life are able to further raising.
Above-mentioned negative pole uses and contains under the situation of the carbonaceous material that can adsorb and discharge lithium ion, can avoid using the problem of the sort of lithium skeleton that is easy to generate in the slim nonaqueous electrolytic solution secondary battery of lithium metal or lithium alloy negative pole.
Above-mentioned carbonaceous material uses the face interval d with (002) face 002Be the material of the following graphite crystal of 0.340nm, can further improve the capacity and the large current characteristic of above-mentioned secondary cell.
If have a kind of electrode in above-mentioned positive pole and the negative pole at least, the conductive board that uses a kind of loose structure is as collector body, said loose structure is to have above diameter hole below 3 millimeters on per 10 sq, then because can guarantee necessary pole strength, make evenly impregnation nonaqueous electrolytic solution of electrode group, so can further improve the cycle life of above-mentioned secondary cell.
Adopt nonaqueous electrolytic solution secondary battery manufacture method of the present invention, between positive pole and negative pole, insert dividing plate and make the electrode group, and after making it impregnation and being dissolved with the high molecular solution of cementability, above-mentioned electrode group is carried out drying, and this method can make the macromolecule that keeps having cementability in the hole of positive pole, negative pole and dividing plate at least.Its result, because can make electrode group inside be distributed with three-dimensional netted cementability macromolecule at least, so the one side of dividing plate and positive pole, another side directly contacts with negative pole, can realize positive pole.Integrated between negative pole and the dividing plate.Therefore, even use under the situation of film material as housing material, also can guarantee the adaptation between both positive and negative polarity and the dividing plate, the internal resistance that can also suppress simultaneously to cause because of the cementability macromolecule is risen.Moreover, above-mentioned porousness part be because can keep nonaqueous electrolytic solution in its hole, so can be favourable and the conduction of lithium ion.Therefore, utilize to use above-mentioned electrode group impregnation nonaqueous electrolytic solution and be placed on method in the required housing material, can produce a kind of slim nonaqueous electrolytic solution secondary battery that also has good energy density, large current characteristic and cycle life down simply.
In above-mentioned manufacture method, after dividing plate inserted the electrode group of making between positive pole and the negative pole and place among the membranaceous housing material, injection is dissolved with the high molecular solution of cementability and makes it impregnation in above-mentioned electrode group, and above-mentioned electrode group carried out vacuumize, utilize this method not only can above-mentioned both positive and negative polarity and the hole of dividing plate in form the porousness bonding portion, and can also make formation porousness bonding portion on suitable with the above-mentioned electrode group most peripheral at least surface, therefore above-mentioned membranaceous housing material can be fixed on the above-mentioned electrode group.Its result, in above-mentioned secondary cell, owing to can suppress for example to make nonaqueous electrolytic solution produce oxidation Decomposition under the high-temperature atmosphere because of charged state remains on, so the dilatancy of above-mentioned electrode group when producing carbon dioxide is the damage that above-mentioned secondary cell causes electronic equipment can prevent to produce gas the time.
By above-mentioned baking temperature is set in below 100 ℃, can suppress dividing plate, particularly contain the thermal contraction of polyethylene or polyacrylic dividing plate.Its result, because the adhesive strength of positive pole, negative pole and dividing plate is further improved, the large current characteristic of above-mentioned secondary cell and cycle life can further improve.
When carrying out above-mentioned drying below 100 ℃, the organic solvent that adopts boiling point to be in below 200 ℃ can improve the evaporation rate of solvent, thus not only can make heat littler to the influence of dividing plate, and the adhesive strength of both positive and negative polarity and dividing plate is further improved.
When carrying out above-mentioned drying below 100 ℃, by aforementioned barriers is reduced to below 20% at 120 ℃ of following percent thermal shrinkages of 1 hour, can make the thermal contraction of dividing plate littler, so the adhesive strength of both positive and negative polarity and dividing plate can further improve.
The above-mentioned accompanying drawing of following reference describes embodiments of the invention in detail.The making of embodiment 1＜positive pole 〉
Making a slice electrode density at first in accordance with the following methods is 3 gram per centimeters 3Electrode: at 91 weight % lithium and cobalt oxides (Li XCoO 2Wherein X satisfies 0≤X≤1) in the powder, add 3.5 weight % acetylene carbon blacks, 3.5 weight % graphite, 2 weight % trimerization second third monomer powders and toluene mixed together, after being coated on it on two sides of the collector body that 10 square centimeters of porousness aluminium foils (thickness 15 μ m) that go up to have 0.5 millimeter hole of 10 diameters make, pressurization.The making of＜negative pole 〉
Will as carbonaceous material with, (fibre diameter 8 μ m, average fiber length 20 μ m, centre plane be (d at interval through the mesophase pitch based carbon fiber of 3000 ℃ of heat treated 93 weight % 002) be 0.3360nm) powder, mix with the polyvinylidene fluoride (PVdF) of the 7 weight % that use as bonding agent, it is coated on the collector body of being made by the porousness Copper Foil (thickness 15 μ m) that 10 diameters to be arranged on 10 square centimeters be 0.5 millimeter hole, the pressurization of dry back, making a slice electrode density is 1.3 gram per centimeters 3Electrode.The making of＜dividing plate 〉
Prepare two by polyethylene porous membrane (thickness 25 μ m, 120 ℃ of percent thermal shrinkages in following 1 hour are 20%, porosity is 50%) dividing plate made, make each limit of dividing plate grow 2 millimeters and 1.5 millimeters respectively, stretch out 1 millimeter and 0.75 millimeter respectively from the two ends of anodal and negative pole than anodal and each limit of negative pole.The modulation of＜nonaqueous electrolytic solution 〉
Lithium hexafluoro phosphate (LiPF 6) dissolve with the mixed solvent (mixed volume was than 1: 2) of ethylene carbonate (EC) with methyl ethyl carbonate (MEC), making concentration is 1 mol, makes nonaqueous electrolytic solution.The making of＜electrode group 〉
According to the order of dividing plate, positive pole, dividing plate and negative pole, the positive pole, negative pole and the dividing plate that obtain is stacked, coil into drum, making most peripheral is dividing plate, is configured as the flat pattern shown in the accompanying drawing 4 and makes the electrode group.Before stacked, welding strip-shaped positive electrode lead-in wire on the collector body of above-mentioned positive pole, the banded negative wire of welding on the collector body of above-mentioned negative pole.
The aluminium foil two sides is coated with the thick stacked film system pouch of polyacrylic 100 μ m, above-mentioned electrode group is placed in one, as shown in Figure 3, above-mentioned lamination surface can be seen from the opening portion of bag.To be dissolved in as the high molecular polyacrylonitrile of cementability (PAN) and make it concentration in the organic solvent dimethyl formamide (135 ℃ of boiling points) and reach 0.5 weight %.The solution that obtains is injected electrode group in the above-mentioned stacked film, and the injection rate that is equivalent to every 100mAh is 0.25 milliliter, makes above-mentioned solution be impregnated into above-mentioned electrode group inside, simultaneously on all surfaces attached to the electrode group.
Then the electrode group in the above-mentioned stacked film is carried out vacuumize in 12 hours under 80 ℃, evaporate above-mentioned organic solvent, make to keep the cementability macromolecule in the hole of positive pole, negative pole and dividing plate, make simultaneously and form the porousness bonding portion on the above-mentioned electrode group surface.The PAN total amount is equivalent to every 100mAh1.25 milligram.
Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, injection rate is equivalent to 1Ah battery capacity 4.1 grams, is assembled into the structure with above-mentioned attached Fig. 1 and 2,3 millimeters of thickness, 40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters.Embodiment 2
Except using aluminium, be assembled into slim nonaqueous electrolytic solution secondary battery similarly to Example 1 as the negative pole.Embodiment 3
Be configured as in the satchel product at stacked film, the electrode group that the mode similarly to Example 1 inserted is made as shown in Figure 3, can see above-mentioned lamination surface from the opening portion of bag.In the dimethyl formamide (153 ℃ of boiling points) as organic solvent, dissolving makes its concentration reach 0.5 weight % as the high molecular polyvinylidene fluoride of cementability (PVdF).Inject the solution obtain in the electrode group in above-mentioned stacked film, suitable injection rate with the 100mAh battery capacity is identical with embodiment 1, makes above-mentioned solution impregnation time the above-mentioned electrode group inside, on all surfaces attached to above-mentioned electrode group.
Then the electrode group in the above-mentioned stacked film is carried out vacuumize in 24 hours under 40 ℃, evaporate above-mentioned organic solvent, make to keep the cementability macromolecule in the hole of positive pole, negative pole and dividing plate, make simultaneously and form the porousness bonding portion on the above-mentioned electrode group surface.The PVdF total amount is equivalent to every 100mAh1.15 milligram.
Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, make the suitable injection rate of 1Ah battery capacity identical, be assembled into and have structure shown in above-mentioned attached Fig. 1 and 2,3 millimeters of thickness with embodiment 1,40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters.Embodiment 4
Except the vacuumize condition changed to 80 ℃ 12 hours, other with embodiment 3 in explanation identical, be assembled into slim nonaqueous electrolytic solution secondary battery.Embodiment 5
Except the vacuumize condition changed to 100 ℃ 6 hours, other with embodiment 3 in explanation identical, be assembled into slim nonaqueous electrolytic solution secondary battery.Embodiment 6
Except using aluminium as the negative pole, other with embodiment 3 in illustrate identical, be assembled into slim nonaqueous electrolytic solution secondary battery.Embodiment 7
Be configured as in the satchel product at stacked film, insert the electrode group of making equally with embodiment 1 explanation, as shown in Figure 3, above-mentioned lamination surface can be seen from the opening portion of bag.In the dimethyl formamide (153 ℃ of boiling points) that uses as organic solvent, dissolving makes its concentration reach 0.1 weight % as the polyvinylidene fluoride (PVdF) that the cementability macromolecule uses.Inject the solution obtain in the electrode group in above-mentioned stacked film, make the suitable injection rate of 100mAh battery capacity identical, make above-mentioned solution impregnation time the above-mentioned electrode group inside, on all surfaces attached to above-mentioned electrode group with embodiment 1.
Then the electrode group in the above-mentioned stacked film is carried out vacuumize in 12 hours under 80 ℃, evaporate above-mentioned organic solvent, make to keep the cementability macromolecule in the hole of positive pole, negative pole and dividing plate, make simultaneously and form the porousness bonding portion on the above-mentioned electrode group surface.The PVdF total amount is equivalent to every 100mAh0.23 milligram.
Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, make the suitable injection rate of 1Ah battery capacity identical, be assembled into and have structure shown in the above-mentioned accompanying drawing 1,3 millimeters of thickness with embodiment 1,40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters.Embodiment 8
Be configured as in the satchel product at stacked film, insert with embodiment 1 in the electrode group made equally of explanation, shown in above-mentioned accompanying drawing 3, lamination surface can be seen from the opening portion of bag.In the dimethyl formamide (153 ℃ of boiling points) that uses as organic solvent, dissolving makes its concentration reach 1 weight % as the polyvinylidene fluoride (PVdF) that the cementability macromolecule uses.Inject the solution obtain in the electrode group in above-mentioned stacked film, make the suitable injection rate of 100mAh battery capacity identical, make above-mentioned solution impregnation time the above-mentioned electrode group inside, on all surfaces attached to above-mentioned electrode group with embodiment 1.
Then the electrode group in the above-mentioned stacked film is carried out vacuumize in 12 hours under 80 ℃, evaporate above-mentioned organic solvent, make to keep the cementability macromolecule in the hole of positive pole, negative pole and dividing plate, make simultaneously and form the porousness bonding portion on the above-mentioned electrode group surface.The PVdF total amount is equivalent to every 100mAh2.3 milligram.
Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, make the suitable injection rate of 1Ah battery capacity identical, be assembled into and have structure shown in the above-mentioned accompanying drawing 1,3 millimeters of thickness with embodiment 1,40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters.Embodiment 9
Be configured as in the satchel product at stacked film, insert the electrode group of making equally with embodiment 1 explanation, make shown in above-mentioned accompanying drawing 3, lamination surface can be seen from the opening portion of bag.In the dimethyl formamide (153 ℃ of boiling points) that uses as organic solvent, dissolving makes its concentration reach 2.5 weight % as the polyvinylidene fluoride (PVdF) that the cementability macromolecule uses.Inject the solution obtain in the electrode group in above-mentioned stacked film, make the suitable injection rate of 100mAh battery capacity identical, make above-mentioned solution impregnation time the above-mentioned electrode group inside, on all surfaces attached to above-mentioned electrode group with embodiment 1.
Then the electrode group in the above-mentioned stacked film is carried out vacuumize in 12 hours under 80 ℃, evaporate above-mentioned organic solvent, make to keep the cementability macromolecule in the hole of positive pole, negative pole and dividing plate, make simultaneously and form the porousness bonding portion on the above-mentioned electrode group surface.The PVdF total amount is equivalent to every 100mAh2.88 milligram.
Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, make the suitable injection rate of 1Ah battery capacity identical, be assembled into and have structure shown in the above-mentioned accompanying drawing 1,3 millimeters of thickness with embodiment 1,40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters.Embodiment 10
Be configured as in the satchel product at stacked film, insert with embodiment 1 in the electrode group made equally of explanation, make shown in above-mentioned accompanying drawing 3, lamination surface can be seen from the opening portion of bag.In the dimethyl formamide (153 ℃ of boiling points) that uses as organic solvent, dissolving makes its concentration reach 1 weight % as the polyacrylate (PMMA) that the cementability macromolecule uses.Inject the solution obtain in the electrode group in above-mentioned stacked film, make the suitable injection rate of 100mAh battery capacity identical, make above-mentioned solution impregnation time the above-mentioned electrode group inside, on all surfaces attached to above-mentioned electrode group with embodiment 1.
Then the electrode group in the above-mentioned stacked film is carried out vacuumize in 12 hours under 80 ℃, evaporate above-mentioned organic solvent, make to keep the cementability macromolecule in the hole of positive pole, negative pole and dividing plate, make simultaneously and form the porousness bonding portion on the above-mentioned electrode group surface.The PMMA total amount is equivalent to every 100mAh1.15 milligram.
Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, make the suitable injection rate of 1Ah battery capacity identical, be assembled into and have structure shown in the above-mentioned accompanying drawing 1,3 millimeters of thickness with embodiment 1,40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters.Embodiment 11
Be configured as in the satchel product at stacked film, insert with embodiment 1 in the electrode group made equally of explanation, make shown in above-mentioned accompanying drawing 3, lamination surface can be seen from the opening portion of bag.In the dimethyl formamide (153 ℃ of boiling points) that uses as organic solvent, dissolving makes its concentration reach 0.5 weight % as the polyvinyl chloride (PVC) that the cementability macromolecule uses.Inject the solution obtain in the electrode group in above-mentioned stacked film, make the suitable injection rate of 100mAh battery capacity identical, make above-mentioned solution impregnation time the above-mentioned electrode group inside, on all surfaces attached to above-mentioned electrode group with embodiment 1.
Then the electrode group in the above-mentioned stacked film is carried out vacuumize in 12 hours under 80 ℃, evaporate above-mentioned organic solvent, make to keep the cementability macromolecule in the hole of positive pole, negative pole and dividing plate, make simultaneously and form the porousness bonding portion on the above-mentioned electrode group surface.The PVC total amount is equivalent to every 100mAh1.15 milligram.
Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, make the suitable injection rate of 1Ah battery capacity identical, be assembled into and have structure shown in the above-mentioned accompanying drawing 1,3 millimeters of thickness with embodiment 1,40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters.Embodiment 12
Be configured as in the satchel product at stacked film, insert with embodiment 1 in the electrode group made equally of explanation, make shown in above-mentioned accompanying drawing 3, lamination surface can be seen from the opening portion of bag.In the dimethyl formamide (153 ℃ of boiling points) that uses as organic solvent, dissolving makes its concentration reach 0.5 weight % as the poly(ethylene oxide) (PEO) that the cementability macromolecule uses.Inject the solution obtain in the electrode group in above-mentioned stacked film, make the suitable injection rate of 100mAh battery capacity identical, make above-mentioned solution impregnation time the above-mentioned electrode group inside, on all surfaces attached to above-mentioned electrode group with embodiment 1.
Then the electrode group in the above-mentioned stacked film is carried out vacuumize in 12 hours under 80 ℃, evaporate above-mentioned organic solvent, make to keep the cementability macromolecule in the hole of positive pole, negative pole and dividing plate, make simultaneously and form the porousness bonding portion on the above-mentioned electrode group surface.The PEO total amount is equivalent to every 100mAh1.15 milligram.
Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, make the suitable injection rate of 1Ah battery capacity identical, be assembled into and have structure shown in the above-mentioned accompanying drawing 1,3 millimeters of thickness with embodiment 1,40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters.Reference examples 1
Be configured as in the satchel product at stacked film, insert the electrode group of making equally with the foregoing description 1 explanation, make shown in above-mentioned accompanying drawing 3, lamination surface can be seen from the opening portion of bag.Above-mentioned electrode group is implemented 80 ℃ of vacuumizes in 12 hours.Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, make the suitable injection rate of 1Ah battery capacity identical, be assembled into and have structure shown in the above-mentioned accompanying drawing 1,3 millimeters of thickness with embodiment 1,40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters.Reference examples 2
Use gel electrolyte (polyacrylonitrile (PAN), LiPF 6, the mol ratio PAN between EC and the MEC: LiPF 6: EC: MEC=16: the dividing plate that replaces nonaqueous electrolytic solution impregnation nonwoven fabrics the to make material that mixing in 5: 55: 24 obtains), and except not forming the porousness adhesive linkage, be assembled into slim nonaqueous electrolytic solution secondary battery similarly to Example 1.Reference examples 3
In the dimethyl formamide (153 ℃ of boiling points) that uses as organic solvent, dissolving makes concentration reach 3 weight % as the polyvinylidene fluoride (PVdF) that the cementability macromolecule uses.With the solution that obtains, be coated on the two sides with the same dividing plate of embodiment 1 explanation.Aforementioned barriers is placed between similarly to Example 1 the positive pole and negative pole, make sandwich.After 80 ℃ of vacuumizes in 12 o'clock of above-mentioned sandwich enforcement, forming the porousness adhesive linkage between positive pole and the dividing plate and between negative pole and the dividing plate.Then above-mentioned sandwich being coiled into the drum postforming is flat pattern, makes the electrode group.
Inject above-mentioned nonaqueous electrolytic solution in the electrode group in above-mentioned stacked film, make the suitable injection rate of 1Ah battery capacity identical, be assembled into 3 millimeters of thickness, 40 millimeters of width, the slim nonaqueous electrolytic solution secondary battery that height is 70 millimeters with embodiment 1.
Under 20 ℃ of environment, after having carried out following charge and discharge cycles test: charging current 300mA charging 5 hours reaches 4.2V to voltage down with regard to the secondary cell that obtains in embodiment 1,3～5,7～12 and the reference examples 1～3, under 300mA, be discharged to voltage and reach 2.7V.On the other hand, after the secondary cell that obtains with regard to embodiment 2 and 6 has carried out following charge and discharge cycles test: charging current 300mA charging 5 hours reaches 4.0V to voltage down, under 300mA, be discharged to voltage and reach 2.7V.The charge and discharge cycles test is carried out under 20 ℃ of atmosphere.In each charge and discharge cycles test, the discharge capacity of first circulation time (initial capacity) is shown in the following table 2 with the capability retention of the battery capacity of the 300th circulation time.
And, with regard to the secondary cell that obtains in embodiment 1,3～5,7～12 and the reference examples 1～3, after charging reached 4.2V to voltage in 5 hours under the charging current 300mA, measured the discharge capacity that under 2C, is discharged to voltage 2.7V, (discharge capacity under the 2C: initial capacity), its result remembers in the lump in following table 2 to calculate the capability retention of 2C discharge.On the other hand, the secondary cell that obtains with regard to embodiment 2 and 6 is charging 5 hours to voltage 4.0V under the charging current 300mA, measured the discharge capacity when being discharged to voltage 2.7V under 2C, calculated the capability retention under the 2C discharge rate, its result remembers in the lump in following table 2.
Table 1
The high molecular kind of cementability The high molecular concentration of cementability (%) in the solution Vacuum drying temperature (℃) Negative pole
Embodiment 1 ????PAN ????0.5 ????80 Carbonaceous material
Embodiment 2 ????PAN ????0.5 ????80 ?????Al
Embodiment 3 ????PVdF ????0.5 ????40 Carbonaceous material
Embodiment 4 ????PVdF ????0.5 ????80 Carbonaceous material
Embodiment 5 ????PVdF ????0.5 ????100 Carbonaceous material
Embodiment 6 ????PVdF ????0.5 ????80 ?????Al
Embodiment 7 ????PVdF ????0.1 ????80 Carbonaceous material
Embodiment 8 ????PVdF ????1 ????80 Carbonaceous material
Embodiment 9 ????PVdF ????2.5 ????80 Carbonaceous material
Embodiment 10 ????PMMA ????0.5 ????80 Carbonaceous material
Embodiment 11 ????PVC ????0.5 ????80 Carbonaceous material
Embodiment 12 ????PEO ????0.5 ????80 Carbonaceous material
Comparative example 1 No cementability macromolecule (nonaqueous electrolytic solution) Carbonaceous material
Comparative example 2 No cementability macromolecule (gel electrolyte) Carbonaceous material
Comparative example 3 ????PVdF ????3.0 ????80 Carbonaceous material
Table 2
Initial capacity (mAh) 300 circulation back capability retentions (%) 2C discharge rate capability retention (%)
Embodiment 1 ????600 ????80 ????75
Embodiment 2 ????550 ????75 ????70
Embodiment 3 ????550 ????75 ????75
Embodiment 4 ????620 ????90 ????85
Embodiment 5 ????600 ????80 ????60
Embodiment 6 ????550 ????75 ????70
Embodiment 7 ????600 ????70 ????90
Embodiment 8 ????600 ????85 ????70
Embodiment 9 ????550 ????70 ????50
Embodiment 10 ????600 ????85 ????70
Embodiment 11 ????500 ????80 ????70
Embodiment 12 ????400 ????80 ????70
Comparative example 1 ????50 ????0 ????0
Comparative example 2 ????400 ????70 ????40
Comparative example 3 ????450 ????30 ????50
Table 1～2 explanations, form on the sort of surface among the embodiment 1～12 in the hole between bonding portion and positive pole, negative pole and the dividing plate and possess the high molecular electrode group of cementability respectively, initial capacity and cycle life are good, compare with the secondary cell in the reference examples 1～3, especially can improve the discharge capacity under the big electric current of 2C.The macromolecule that particularly has cementability is the secondary cell of the embodiment 4 of PVdF, is that secondary cell among the embodiment 1,10～12 of PAN, PVC and PEO is compared with above-mentioned macromolecule, and initial capacity, cycle life and heavy-current discharge characteristic are all good.
In contrast, the sort of high molecular secondary cell of cementability that do not contain in the reference examples 1 is compared with the secondary cell among the embodiment 1～12, and initial capacity, cycle life and heavy-current discharge characteristic etc. are all much lower.On the other hand, about the discharge capacity under the big electric current of 2C, do not contain the cementability macromolecule, replace the secondary cell in the reference examples 2 of nonaqueous electrolytic solution with gel electrolyte, lower than the secondary cell among the embodiment 1～8.And, the sort of secondary cell in the reference examples 2, electrode group wherein has the porousness adhesive linkage between positive pole and the dividing plate and between negative pole and the dividing plate, and its initial capacity, cycle life and heavy-current discharge capacity are all low than the secondary cell among the embodiment 1～12.The making of embodiment 13＜positive pole 〉
Making electrode density by the following method is 3 gram per centimeters 3, collector body two sides carrier band has the positive pole of anodal layer: at first at 91 weight % lithium and cobalt oxides (Li xCoO 2) add mixed together behind 3.5 weight % acetylene carbon blacks, 3.5 weight % graphite, 2 weight % trimerization second third monomer powders and the toluene in the powder, on the two sides of the collector body that its aluminium foil that is coated on thickness 30 μ m is made after, pressurization.The making of＜negative pole 〉
Will as carbonaceous material with, (centre plane is (d at interval for fibre diameter 8 μ m, average fiber length 20 μ m through the mesophase pitch based carbon fiber of 3000 ℃ of heat treated 93 weight % 002) be 0.3360nm) powder, mixes with the polyvinylidene fluoride (PVdF) of the 7 weight % that use as bonding agent, it is coated on the two sides of Copper Foil collector body of thickness 15 μ m, pressurize in dry back, and making electrode density is 1.3 gram per centimeters 3, negative pole with negative electrode layer carrier band structure on the collector body two sides.
The dividing plate that the polyethylene porous membrane of thickness 15 μ m is made places between above-mentioned positive pole and the above-mentioned negative pole, coils into drum, makes the electrode group.
Then, above-mentioned electrode group is placed in the stainless steel band round-ended cylinder shape container.To be dissolved in the dimethyl formamide (153 ℃ of boiling points) that uses as organic solvent as the polyvinylidene fluoride (PVdF) that the cementability macromolecule uses, and make concentration reach 0.1 weight %.Inject the solution obtain in the electrode group in said vesse, make the injection rate suitable equal 0.25 milliliter, make above-mentioned solution impregnation time the above-mentioned electrode group inside, on all surfaces attached to above-mentioned electrode group with the 100mAh battery capacity.
Then the electrode group in the said vesse is implemented 80 ℃ of vacuumizes in 12 hours, evaporate above-mentioned organic solvent, make in the hole of positive pole, negative pole and dividing plate to keep the cementability macromolecule, make simultaneously and form the porousness bonding portion on the above-mentioned electrode group surface.The PVdF total amount is equivalent to every 100mAh0.23 milligram.
The same nonaqueous electrolytic solution of explanation of injection and embodiment 1 in the electrode group in said vesse makes the suitable injection rate of 1Ah battery capacity equal 3.8 grams, is assembled into cylindric nonaqueous electrolytic solution secondary battery after sealing.Reference examples 4
With the dividing plate that the polyethylene porous membrane of thickness 25 μ m is made, place and anodal and above-mentioned negative pole that the foregoing description 13 explanation is same between, coil into drum, make the electrode group.
Then, above-mentioned electrode group is placed in the stainless steel band round-ended cylinder shape container, inject and the same nonaqueous electrolytic solution of embodiment 1 explanation, make the suitable injection rate of 1Ah battery capacity equal 3.8 grams, be assembled into cylindric nonaqueous electrolytic solution secondary battery after sealing.
The secondary cell that obtains with regard to embodiment 13 and reference examples, charging under the 800mA charging current 3 hours to voltage 4.2V, in the test that discharges and recharges of having implemented to be discharged under the 800mA discharging current 2.7V under 20 ℃ of atmosphere.The capability retention of the discharge capacity (initial capacity) of circulation for the first time and the 300th circulation time in the test of each charge and discharge cycles (with respect to above-mentioned initial capacity) is shown among the following table 3.
In addition, the secondary cell that obtains of embodiment 13 and reference examples just, charging under the 800mA charging current 3 hours to voltage 4.2V, the discharge capacity when measuring the 2C discharge, the capability retention when calculating the 2C discharge, the result also charges in the following table 3.
Table 3
Initial capacity (mAh) Capability retention (%) after 300 circulations The capability retention of 2C discharge rate (%)
Embodiment 13 ????1800 ????95 ????90
Reference examples 4 ????1600 ????85 ????80
Data declaration in the table 3, in embodiment 13, all maintain the high molecular electrode group of cementability in the hole with formation bonding portion and positive pole, negative pole and dividing plate on the surface, place make in the canister secondary cell, with do not compare with not containing the secondary cell that the high molecular electrode group of cementability makes in the reference examples 4, not only can use the book dividing plate, and initial stage discharge capacity, cycle life and heavy-current discharge characteristic are all good.
For the slim nonaqueous electrolytic solution secondary battery of making in the above embodiments,, also can respectively use positive pole, negative pole and a dividing plate to make the electrode group though be the explanation of carrying out with regard to the electrode group example that uses most positive poles, negative pole and dividing plate to make.
In the above embodiments 1, order according to dividing plate, positive pole, dividing plate, negative pole gathers into folds positive pole, negative pole and carrier ring, coil into drum, make dividing plate be in most peripheral, make the electrode group of the flat pattern shown in the accompanying drawing 4, but also can be assembled into slim nonaqueous electrolytic solution secondary battery then similarly to Example 4 according to the crooked electrode group of making shape shown in the accompanying drawing 5 behind the sequential cascade of positive pole, dividing plate and negative pole.With comparing among the embodiment 4, though that the battery capacity of this secondary cell reduces is about 10%, other performances are identical with embodiment 4.
Illustrated in the foregoing description that the use metal has round-ended cylinder appearance device to make nonaqueous electrolytic solution secondary battery, but also can use metal to have end rectangular vessel to make the rectangle nonaqueous electrolytic solution secondary battery equally.
As mentioned above, the present invention can provide a kind of and have thickness less than 4 millimeters thin type structure, can improve the nonaqueous electrolytic solution secondary battery of discharge capacity, cycle performance and heavy-current discharge characteristic.
And the present invention can provide a kind of thickness of making less than 4 millimeters thin type structure, the simple manufacture method of nonaqueous electrolytic solution secondary battery that discharge capacity, cycle performance and heavy-current discharge characteristic are improved.
Accompanying drawing 1 is the sectional drawing of an example of expression nonaqueous electrolytic solution secondary battery of the present invention
Accompanying drawing 2 is amplification profile diagrams of A part in the expression accompanying drawing 1
Accompanying drawing 3 is in the electrode group of nonaqueous electrolytic solution secondary battery of expression accompanying drawing 1, near the schematic diagram of situation anodal layer, dividing plate and the negative electrode layer
Accompanying drawing 4 is that expression is coiled the axis side view that forms nonaqueous electrolytic solution secondary battery with one group of positive pole, negative pole and dividing plate
Accompanying drawing 5 is explanations that expression is made the axis side view symbol of nonaqueous electrolytic solution secondary battery with one group of positive pole, negative pole and dividing plate bending:
1 ... housing material 41 ... anodal
2 ... electrode group 42 ... dividing plate
3 ... dividing plate 43 ... negative pole
4 ... anodal layer 51 ... anodal
5 ... positive electrode collector 52 ... dividing plate
6 ... negative electrode layer 53 ... negative pole
7 ... negative electrode collector
8 ... bonding portion
9 ... macromolecule with cementability
10 ... positive wire
11 ... negative wire

Claims (7)

1, a kind of nonaqueous electrolytic solution secondary battery, have band positive pole, negative pole, be arranged on the electrode group that the dividing plate between said positive pole and the said negative pole is made, and nonaqueous electrolytic solution, it is characterized in that in the hole of said positive pole, said negative pole and said dividing plate, all possessing at least the cementability macromolecule, with said positive pole, said negative pole with said dividing plate is bonding is integral.
2, according to the described nonaqueous electrolytic solution secondary battery of claim 1, it is characterized in that also having the housing material that surrounds said electrode group, said housing material has the polymeric adhesion of cementability on said electrode group with said.
3, according to the described nonaqueous electrolytic solution secondary battery of claim 1, it is characterized in that the said high molecular total amount that cementability is arranged, for every 100mAh battery capacity, be in 0.2～6 nanogram range, and the quantity of said nonaqueous electrolytic solution is in 0.2～0.6 gram scope for every 100mAh battery capacity.
4, a kind of manufacture method of nonaqueous electrolytic solution secondary battery is characterized in that having following operation:
Dividing plate is placed the operation of making the electrode group between positive pole and the negative pole,
Make said electrode group impregnation dissolving cementability macromolecule form the operation of solution,
With the operation of said electrode group drying, shaping, and
Make the operation of said electrode group impregnation nonaqueous electrolytic solution.
5, according to the manufacture method of the described nonaqueous electrolytic solution secondary battery of claim 4, it is characterized in that dissolving concentration that the macromolecule with cementability forms solution, to be in 0.1 weight % above and below the 2.5 weight %.
6, a kind of nonaqueous electrolytic solution secondary battery, wherein has the electrode group of being with positive pole, negative pole, being arranged on the dividing plate between said positive pole and the said negative pole, and nonaqueous electrolytic solution, it is characterized in that in the hole of said positive pole, said negative pole and said dividing plate, possessing respectively at least the cementability macromolecule, with said positive pole, said negative pole with said dividing plate is bonding is integral, and said electrode group is coiled positive pole, negative pole and dividing plate or crooked forming.
7,, it is characterized in that the end of dividing plate is stretched out from anodal and negative pole, and on said extension, have macromolecule with cementability according to the described nonaqueous electrolytic solution secondary battery of claim 6.
CN99118335A 1998-08-31 1999-08-31 Nonaqueous electrolytic secondary battery and manufacture method thereof Expired - Lifetime CN1132261C (en)

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