CN1128482C - Lithium ion battery and method of manufacture thereof - Google Patents
Lithium ion battery and method of manufacture thereof Download PDFInfo
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- CN1128482C CN1128482C CN98805155A CN98805155A CN1128482C CN 1128482 C CN1128482 C CN 1128482C CN 98805155 A CN98805155 A CN 98805155A CN 98805155 A CN98805155 A CN 98805155A CN 1128482 C CN1128482 C CN 1128482C
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- 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
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- 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
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Abstract
The present invention aims to simply the fabrication of a lithium ion secondary battery and enhances production rate. The battery does not need a firm casing, is capable of realizing small size and light weight and having any shape and has the advantages of high structural strength and capability of ensuring high security performance and high performance. The method for fabricating the lithium ion secondary battery of the present invention comprises the following steps: a working procedure of partly stacking adhesive resin (6) at least containing part of plastic resin between an anode (3) and a cathode (5) and a working procedure of making the adhesive resin (6) undergo plastic deformation.
Description
Technical field
The present invention relates to lithium ion battery.More specifically, relate to and to have arbitrary shape such as slim high-performance secondary cell and manufacture method thereof.
Background technology
Press for the size and the weight that reduce the Portable electronic equipment now, and the realization of this hope depends on the raising of battery performance to a great extent.In order to satisfy the research that these needs have carried out improving battery performance widely.The performance of desired battery comprises high voltage, high-energy-density, high security and shaped design freely.In conventional batteries, be the most promising secondary cell from high voltage and high-energy-density lithium ion battery, and still it studied to improve its performance.
At present the lithium ion battery that uses has: the positive plate of the powder preparation by applying lithium cobalt oxide etc. to collector body, the negative plate for preparing by the powder that applies material with carbon element to collector body similarly.For these electrodes (being positive pole and negative pole) are used on the lithium ion battery, the ionic conduction layer with electronic conductivity must be arranged, can between two electrodes, move by this layer lithium ion.Usually, be embedded between the electrode as the ionic conduction layer by perforated membranes such as polyethylene partition that make, that be filled with non-aqueous eletrolyte.
As shown in Figure 7, the outer rigid housing of being made by metal etc. 1 is used for splendid attire positive pole 3, negative pole 5 and contain the partition 4 of electrolyte etc.Do not have shell 1, will be difficult to positive pole 3, negative pole 5 and partition are combined in one.If separate the performance degradation that then can make battery.But shell 1 makes battery heavy and can not freely design its profile.Therefore, just developing the battery that does not need shell 1 now.One of problem of developing this battery that does not need shell 1 how to be electrode 3 and 5 and the partition 4 that is clipped between them combine, and can under the situation that does not apply external force, keep this bonding state.
About this connection, United States Patent (USP) N0.5,460,904 disclose the method that a kind of formation is clipped in the ionic conduction layer between positive pole and the negative pole, wherein instructed and adopted a kind of polymer that wherein is mixed with plasticiser, this plasticiser has at least a part to move in the electrolyte.But U.S. Patent No. 5,460,904 disclosed methods are not preferred manufacture method, because relate to the processing of organic solvent when forming the ionic conduction layer, must remove the step and the equipment of organic solvent.
Summary of the invention
Therefore, in order to realize practical thin lithium ion battery, need a kind of battery structure of exploitation and manufacture method thereof, this structure can guarantee efficiently in conjunction with positive pole and negative pole, and can guarantee enough structural strengths and fail safe as battery.
Manufacture method according to first kind of lithium ion battery of the present invention, this battery comprises the positive pole that is formed with positive electrode active material layer, the negative pole that is formed with negative electrode active material layer, and with in their immersion electrolyte, this method comprises the following steps: partly to stack the operation of the adhesive resin that comprises a part of plastic resin at least between positive pole and negative pole; And the operation that makes above-mentioned adhesive resin distortion.
According to the manufacture method of second kind of lithium ion battery of the present invention, in the manufacture method of above-mentioned first kind of lithium ion battery, make the adhesive resin distortion by applying the pressure or the bigger pressure that can make the plastic resin distortion.
According to first kind and second method of the present invention, because adhesive resin comprises plastic resin at least in part, do not need at every turn all dried when (i) connecting anodal and negative pole, (ii) do not need to keep the splendid attire instrument of connection status, (iii) do not need to make one by one the step of adhesive resin distortion, once can finish, (iv) can simplify production equipment, boost productivity, (v) by making plastic resin distortion can increase adhesive resin and just, the contact area of negative pole, improved bonding force, made the battery that obtains have high battery strength enough in the practicality.
According to the manufacture method of the third lithium ion battery of the present invention, in the manufacture method of above-mentioned first kind of lithium ion battery, described plastic resin is a thermoplastic resin.According to this method, because adhesive resin comprises thermoplastic resin at least in part, can simplify production equipment, boost productivity.Under the situation of the heating that abnormal conditions such as short circuit cause, the thermoplastic resin fusing makes current chopping.Therefore can obtain safe lithium ion battery.
According to the manufacture method of the 4th kind of lithium ion battery of the present invention, in the manufacture method of above-mentioned the third lithium ion battery, make described adhesive resin distortion by heating.
According to the manufacture method of the 5th kind of lithium ion battery of the present invention, in the manufacture method of above-mentioned the 4th kind of lithium ion battery, the temperature of heating is more than the temperature that makes thermoplastic resin begin to flow.
According to the 4th and the 5th kind of method, the mobile generation bonding force of thermoplastic resin.Not only contact area increases between the positive and negative electrode of resin, and resin infiltrates generation anchor effect in the lip-deep micropore.Therefore can obtain the lithium ion battery of the high practicality of adhesive strength.
According to the manufacture method of the 6th kind of lithium ion battery of the present invention, in the manufacture method of above-mentioned the third lithium ion battery, make described adhesive resin distortion by under the situation of pressurization, applying ultrasonic wave.According to this method, owing to resin is out of shape effectively by applying ultrasonic wave, even under low pressure or low temperature, also can realize bonding.And, owing to have only the surface of thermoplastic resin to be selectively heated, can realize bonding effectively.
According to first kind of lithium ion battery of the present invention, it is characterized in that having the laminate electrode body, this laminate electrode body comprises the positive pole with the positive electrode active material layer that links to each other with positive electrode collector, the negative pole with the negative electrode active material layer that links to each other with negative electrode collector and the adhesive resin that contains some moldable resin at least that disposes between described positive pole and described negative pole, be formed with the space that is communicated with described positive pole and described negative pole in this adhesive resin.Because adhesive resin comprises plastic resin at least in part, can simplify production equipment, boosts productivity; By making the contact area of plastic resin distortion can increasing adhesive resin and positive and negative electrode, improved bonding force, make the battery that obtains have high battery strength enough in the practicality.
According to second kind of lithium ion battery of the present invention, in above-mentioned first kind of lithium ion battery, described plastic resin is a thermoplastic resin.Because adhesive resin comprises thermoplastic resin at least in part, can simplify production equipment, boosts productivity.Under the situation of the heating that abnormal conditions such as short circuit cause, the thermoplastic resin fusing makes current chopping.Therefore can obtain safe lithium ion battery.
According to the third lithium ion battery of the present invention, in above-mentioned first kind of lithium ion battery, the area of gap account for described positive pole and the opposed surface of described negative pole whole area 30～90%.Owing to be filled with electrolyte in the space between positive pole and negative pole, greatly reduce the resistance of the ionic conduction between the positive and negative electrode.Can under the high charge state, use thus, and guarantee enough adhesive strengths in practicality.
According to the 4th kind of lithium ion battery of the present invention, in above-mentioned first kind of lithium ion battery, the distance between described positive pole and the described negative pole is below the 100 μ m.Owing to be filled with electrolyte in the space between positive pole and negative pole, greatly reduce the resistance of the ionic conduction between the positive and negative electrode, can under the high charge state, use thus.
According to the 5th kind of lithium ion battery of the present invention, in above-mentioned first kind of lithium ion battery, have a plurality of laminate electrode bodies.The lithium ion battery of little but the stable and high power capacity of a kind of volume can be provided.
Description of drawings
Fig. 1 is the constructed profile of battery structure of the lithium ion battery of explanation a kind of embodiment of the present invention;
Fig. 2 schematically illustrates according to a kind of embodiment of the present invention, applies the method for adhesive resin with coating machine;
Fig. 3 is the constructed profile of battery of the lithium ion battery of explanation a kind of embodiment of the present invention;
Fig. 4,5 and 6 is constructed profiles of battery structure of the lithium ion battery of other embodiment of the present invention;
Fig. 7 is the constructed profile of the battery structure of conventional lithium ion battery.
Embodiment
The present invention be useful in have positive pole, negative pole and being clipped in the battery structure of ionic conduction electricity layer therebetween, though the enforcement the solution of the present invention that describes below relates generally to the battery of single electrode build, promptly have a laminate electrode body that comprises positive pole, negative pole and ionic conduction layer, but also can be applicable to have in the layer-built battery body of a plurality of this laminate electrode bodies.
Fig. 1 is the battery structure of explanation according to the lithium ion battery of one embodiment of the invention, the i.e. cutaway view of laminate electrode body.Among the figure, the positive pole of label 3 expression anode active material layer 32 and positive electrode collector 31 be combined intos, the negative pole of label 5 expression anode active material layer 52 and negative electrode collector 51 be combined intos, label 6 expressions comprise the adhesive of a part of plastic resin at least, with this adhesive partly, for example put between positive pole and the negative pole, with in conjunction with positive and negative utmost point active material layer 32 and 35 with point-like, ribbon or waffle-like pattern.Be loaded with the nonaqueous electrolytic solution that contains lithium ion in the space 7 that is communicated with anode active material layer 32 and anode active material layer 52, this adhesive is as the ionic conduction layer.Plastic resin is at room temperature to be to have tack by solid, and the resin that deforms when heating or pressurization.
Lithium ion battery with said structure can be formed by for example following method.
Battery formation method of the present invention, comprise the following steps: adhesive resin 6 partly is applied between positive pole 3 and the negative pole 5, make adhesive resin 6 distortion with methods such as following heating or pressurizations then, reduce the space 7 between positive pole 3 and the negative pole 5, and the degree of depth L in space 7 is reduced to a certain predetermined value.
Owing to the area that the space 7 that adhesive resin 6 produces partly is set, should account for 30～90% of interfacial area between active material layer 32 and 35, be preferably 60%.If this area is less than 30%, then the electrical connection between the active material layer 32 and 35 is insufficient, thereby the resistance that increases ionic conduction is difficult to obtain enough battery behaviors.If this area is greater than 90%, the adhesive between positive pole 3 and the negative pole 5 is not enough, causes layering.
The degree of depth in the space 7 that between active material layer 32 and 35, produces, i.e. distance L between active material layer 32 and the active material layer 35, because of the ionic conductivity of electrolyte different.In the electrolyte ion conductivity that adopts usually is 10
-2Under the situation of S/cm, L is 100 μ m or littler.But preferred 〉=10 μ m, because this moment, anomaly and adstante febre such as be short-circuited, the plastic resin fusing can be brought into play the effect of cut-off current.
Partly applying adhesive resin 6 between positive pole 3 and negative pole 5 makes after its combination, exert pressure and make the step of adhesive resin 6 distortion, this pressurization steps can above-mentioned sandwich and in conjunction with after any time carry out, this step has the effect of the adhesion of the contact area that increases adhesive resin 6 and anodal 3, negative pole 5 and enhancing and adhesive resin 6, thus the battery that can obtain finally to obtain very durable effect when practicality.Preferably, bond strength is decided by that adhesive resin 6 infiltrates anodal 3 and negative pole 5 lip-deep micropores and the anchor effect that produces.Even but only depend in bond strength under the situation of tack of adhesive resin 6, if adhesive resin 6 with anodal 3 and the surface contact area of negative pole 5 enough big, the enough bond strengths in the time of also can guaranteeing to form battery.This step is smooth for the thickness of the adhesive resin 6 that makes it between positive pole 3 and negative pole 5 also to be necessary evenly.If the thickness of adhesive resin 6 is too big, the charging capacity of battery will descend.
In above-mentioned adhesive bonding method since plastic resin have tack, so have the following advantages, that is, and need not each bonding anodal 3 and negative pole 5 after all carry out drying; Need not to keep the anchor clamps of bonding state; Need not exert pressure in turn so that the step of adhesive resin distortion, and can finish all steps once; Reduce the use of solvent, thereby made simplified equipment, improved productivity ratio greatly.
After pressurized adhesion, carry out drying, and collector plate 33 and 53 is connected on the electrode body of acquisition with methods such as spot welding.The laminate electrode body is embedded in the cylinder of being made by aluminium stack membrane 22.Inject electrolyte to this cylinder, seal processing, finished lithium ion battery (see figure 3) thus with single laminate electrode body.
The nonaqueous electrolytic solution that contains lithium ion that uses in the existing battery all can be used as the liquid electrolyte (ion-conducting material) of the electrolyte among the present invention.Particularly, as the solvent of liquid electrolyte, can adopt esters solvents such as ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate; Ethers flux such as dimethoxy-ethane, diethoxyethane, diethyl ether, dimethyl ether; And the mixture of two or more material of from similar or inhomogeneous above-mentioned substance, selecting.As the electrolytic salt in the electrolyte, as LiPF
6, LiAsF
6, LiClO
4, LiBF
4, LiCF
3SO
3, LiN (CF
3SO
2)
2, LiC (CF
3SO
2)
3, LiN (C
2F
5SO
2)
2Deng.
Form slurry in the bonding agent by pulverous anode active material layer and anode active material layer are sneaked into respectively, be applied to respectively on positive electrode collector and the negative electrode collector, dry then, form active material layer 32 and 35.
Being used for that active material is adhered to adhering resin that electrode layer gets on comprises and both is insoluble to the material that electrolyte does not also react at inside battery, for example, the polymer or the copolymer of vinylidene fluoride, PVF, acrylonitrile, oxirane etc., and ethylene-propylene diamine rubber.
The active material that can be used for positive pole 3 comprises: the composite oxides of lithium and magnesium-yttrium-transition metal such as cobalt, nickel or manganese; The chalcogenide that contains lithium; Or the composite oxides of these compounds; And comprise the above-mentioned composite oxides of multiple trace doped element, the chalcogenide that contains lithium or its composite oxides.In these materials, add graphite to be used as the electrical conductivity body.The preferred active material that can be used for negative pole 5 comprises the compound of carbon containing, as graphite, graphitized carbon, ungraphitised carbon, coalescence benzene, polyacetylene and aromatic hydrocarbons with acene structure, as embedding hexichol (or being pyrene), perylene.Negative active core-shell material is not limited to these, any can embedding adding and the material that removes lithium ion (this is battery operated necessary) all can adopt.These active materials use with particle form.Can use size is the particle of 0.3～20 μ m, and preferred size is the particle of 0.3～5 μ m.Anode active material layer 52 also can be used carbon fiber.Too little as fruit granule, when bonding, the area of the active material that bonding agent covers is too big, and lithium ion can not embed and remove effectively when charging, causes the decline of battery performance.Too big as fruit granule, be not easy to form film, and packing density descends also.
Any metal stable at inside battery all can be used as collector body 31 or 51.Anodal 3 excellent aluminium, negative pole 5 is preferably used copper.Collector body 31 and 51 can be paper tinsel, net, drawn metal etc.Consider the fineness of electrode, preferably use paper tinsel.
Though in said method, bonding by the adhesive resin plastic deformation is realized, also can contain the adhesive resin 6 of thermoplastic resin by employing, and realize making to heat under easily deformable temperature of this thermoplastic resin or the higher temperature.As heater, can select hot plate, baking box or infrared heater for use.
Can under temperature that thermoplastic resin is flowed or higher temperature, heat.At this moment, the surperficial contact area of adhesive resin and positive pole 3 and negative pole 5 increases, and resin infiltrates and produces the anchor effect in these surperficial micropores.If adhesive resin is thickness (be favourable in some cases, but needn't leaveing no choice but like this) very, can pressurization when heating.
As long as its fusing point≤200 ℃, and be insoluble to electrolyte, any thermoplastic resin all can use at this.Only otherwise the flowability when damaging its heating, this thermoplastic resin also can comprise high-melting-point composition, inorganic matter etc.
When employing contains the adhesive resin 6 of thermoplastic resin, also can apply ultrasonic wave and realize bonding adding to depress.Ultrasonic wave makes resin make resin distortion effectively, thereby even make under low-pressure low-temperature, also be easy to bonding.And applying ultrasonic wave can optionally heat the part that contacts with electrode of thermoplastic resin, thereby can realize bonding very effectively.
Can implement heating steps in any time after all electrodes are stacked together one by one.This step is effective for the thermal endurance of the battery that raising is finished.
Though the battery that concrete combination has a laminate electrode body 8 has been described embodiment of the present invention, the present invention also can be applicable to have the stacked type battery of a plurality of laminate electrode bodies.Adopt a plurality of laminate electrode bodies can obtain small-sized but stable and have jumbo battery.For example, multilayer electrode build battery can have structure shown in Figure 4, and wherein positive pole 3 and negative pole 5 are alternately arranged, and accompany sheet-like spacer therebetween; Or the structure of Fig. 5 and Fig. 6, wherein positive pole 3 and negative pole 5 are rolled into tubular, accompany strip-like separator therebetween; Or have another unshowned structure, wherein positive pole 3 and negative pole 5 are alternately embedded in the foldable structure of spacer folding band 4.Describe the laminate electrode build battery of Fig. 4～6 in detail below in conjunction with embodiment.
Embodiment given below describes the present invention in more detail, but the present invention is not limited thereto.
(embodiment 1)
LiCoO with 87wt (weight) %
2, 8wt% graphite powder and mix slurry as the Kynoar of the 5wt% of bonding agent with the preparation anode active material layer.With doctor blade this slurry is applied on the thick aluminium foil collector body of 20 μ m and forms negative pole, applied thickness is about 100 μ m.
Mix slurry with the middle phase microballon carbon (Osaka Gas (strain) system) of 95wt% with as the Kynoar of the 5wt% of bonding agent with the preparation anode active material layer.With doctor blade this slurry is applied to formation positive pole on the thick Copper Foil collector body of 12 μ m, applied thickness is about 100 μ m.
Anodal and negative pole are cut into the rectangle of 5cm * 4cm, fixing current collection usefulness terminal (sheet) respectively on the anodal and negative pole in after the cutting each.
With SIS type heat molten type bonding agent (softening point is about 100 ℃ for AK-1, Kanebo NSC (strain) system) with about 20g/m
2Coating amount spraying, partly be applied on anodal and the negative pole.The positive pole and the negative pole that are coated with bonding agent are stacked, bond layer is added 5g/cm
2Pressure, the space between positive pole and the negative pole is reduced.
Then, the electrode body that obtains is inserted in the cylinder of being made by the aluminium stack membrane fully, and intensive drying, electrolyte injected afterwards.This electrolyte is with ethylene carbonate or 1, and the 2-dimethoxy-ethane is made solvent, makes electrolyte with lithium hexafluoro phosphate.After injecting electrolyte, with the sealing of aluminium stack membrane, the making of battery promptly comes to an end.
As the performance of the battery that makes thus, its weight energy density is 80Wh/kg at current value during for 1C.After charging under the current value C/2 200 times, charging capacity can be guaranteed to be initial 90%.
(embodiment 2)
Make similarly to Example 1 its on be fixed with on the anodal and negative pole of the rectangle of 5cm * 4cm of collector plate, with coating machine (MELTEX society system, CP3000) with dot pattern coating butylene-propylene copolymer (new field Gelatin (strain) system, softening point is 84 ℃), coating amount is about 18g/m
2Then, positive pole and negative pole are stacked together, at 80 ℃ of pressurization 20g/cm
2One minute.
Then, the electrode body that obtains is inserted in the cylinder of being made by the aluminium stack membrane fully, and intensive drying, electrolyte injected afterwards.This electrolyte is with ethylene carbonate or 1, and the 2-dimethoxy-ethane is made solvent, makes electrolyte with lithium hexafluoro phosphate.After injecting electrolyte, with the sealing of aluminium stack membrane, the making of battery promptly comes to an end.
As the performance of the battery that makes thus, its weight energy density is 75Wh/kg at current value during for 1C.After charging under the current value C/2 200 times, charging capacity can be guaranteed to be initial 80%.
(embodiment 3)
Make similarly to Example 1 its on be fixed with on the anodal and negative pole of the rectangle of 5cm * 4cm of collector plate, with coating machine (MELTEX society system, CP3000) with dot pattern coating butylene-propylene copolymer (new field Gelatin (strain) system, softening point is 84 ℃), coating amount is about 15g/m
2Then, positive pole and negative pole are stacked together, keep this shape in 100 ℃ of heating cooling after a minute.
Then, the electrode body that obtains is inserted in the cylinder of being made by the aluminium stack membrane fully, and intensive drying, electrolyte injected afterwards.This electrolyte is with ethylene carbonate or 1, and the 2-dimethoxy-ethane is made solvent, makes electrolyte with lithium hexafluoro phosphate.After injecting electrolyte, with the sealing of aluminium stack membrane, the making of battery promptly comes to an end.
As the performance of the battery that makes thus, its weight energy density is 70Wh/kg at current value during for 1C.After charging under the current value C/2 200 times, charging capacity can be guaranteed to be initial 80%.
(embodiment 4)
Make similarly to Example 1 its on be fixed with on the anodal and negative pole of the rectangle of 5cm * 4cm of collector plate, with coating machine (MELTEX society system, CP3000) with dot pattern vinyl coating-methyl methacrylate-copolymer-maleic anhydride (Sumitomo Chemical (strain) system, softening point is 100 ℃), coating amount is about 18g/m
2Then, positive pole and negative pole are stacked together, at 80 ℃ of pressurization 20g/cm
2One minute.
Then, the electrode body that obtains is inserted in the cylinder of being made by the aluminium stack membrane fully, and intensive drying, electrolyte injected afterwards.This electrolyte is with ethylene carbonate or 1, and the 2-dimethoxy-ethane is made solvent, makes electrolyte with lithium hexafluoro phosphate.After injecting electrolyte, with the sealing of aluminium stack membrane, the making of battery promptly comes to an end.
As the performance of the battery that makes thus, its weight energy density is 78Wh/kg at current value during for 1C.After charging under the current value C/2 200 times, charging capacity can be guaranteed to be initial 80%.
(embodiment 5)
Make similarly to Example 1 its on be fixed with on the anodal and negative pole of the rectangle of 5cm * 4cm of collector plate spreading one deck 30g/m equably
2Polyethylene powders.
Then, negative pole is stacked thereon, be combined into one, note reducing the ultrasonic wave output of per unit area to avoid destroying electrode with supersonic welder.
Then, the electrode body that obtains is inserted in the cylinder of being made by the aluminium stack membrane fully, and intensive drying, electrolyte injected afterwards.This electrolyte is with ethylene carbonate or 1, and the 2-dimethoxy-ethane is made solvent, makes electrolyte with lithium hexafluoro phosphate.After injecting electrolyte, with the sealing of aluminium stack membrane, the making of battery promptly comes to an end.
As the performance of the battery that makes thus, its weight energy density is 60Wh/kg at current value during for 1C.After charging under the current value C/2 200 times, charging capacity can be guaranteed to be initial 80%.
(embodiment 6)
Present embodiment is the manufacture method with cell body of tabular laminated construction shown in Figure 4.
Make rectangular positive pole of 5cm * 4cm and negative pole (or anodal) similarly to Example 1.Then, use coating machine with the H6825 (trade name, Nitta Gelatin (strain) system) of dot pattern coating as adhesive resin on two surfaces of positive pole, then, negative pole and positive pole are stacked alternately, 100g/cm exerts pressure
2, form the even thin type structure that constitutes by a plurality of electrode body that stack.
Then, the electrode body that obtains is inserted in the cylinder of being made by the aluminium stack membrane fully, and intensive drying, electrolyte injected afterwards.This electrolyte is with ethylene carbonate or 1, and the 2-dimethoxy-ethane is made solvent, makes electrolyte with lithium hexafluoro phosphate.After injecting electrolyte, with the sealing of aluminium stack membrane, the making of battery promptly comes to an end.
(embodiment 7)
Present embodiment is the manufacture method with cell body of tabular winding-structure shown in Figure 5.
Make the positive pole of 5cm * 23cm and the negative pole of 5cm * 4cm (or anodal) similarly to Example 1, in its end respectively with the fixing collector plate of spot welding.Then, on the two sides of anodal (or negative pole), all apply about 10g/m
2AK-1 (Kanebo NSC (strain) system, softening point is about 100 ℃).Afterwards, with an end of negative pole (or the anodal) predetermined length that folds back, simultaneously a positive pole (or negative pole) is inserted folded part.Another positive pole (or negative pole) is bonded at the position coated and positive pole (or negative pole) of facing elder generation's insertion that is folded part.By reeling being involved in the positive pole by bonding positive pole (or negative pole).Another positive pole (or negative pole) placing on the negative pole (or anodal) with mode that the positive pole that is involved in is earlier faced mutually, and is being involved in negative pole (or anodal) next time in reeling.Repeat these steps so that electrode is rolled into ellipticity.
Then, the electrode body that obtains is inserted in the cylinder of being made by the aluminium stack membrane fully, and intensive drying, electrolyte injected afterwards.This electrolyte is with ethylene carbonate or 1, and the 2-dimethoxy-ethane is made solvent, makes electrolyte with lithium hexafluoro phosphate.After injecting electrolyte, with the sealing of aluminium stack membrane, the making of battery promptly comes to an end.
(embodiment 8)
Present embodiment is the manufacture method with cell body of tabular winding-structure shown in Figure 6.
Be produced on the positive pole and the negative pole that are coated with active material on the collector plate similarly to Example 1, be cut to 5cm * 23cm, fixing collector plate in the one end.
With SIS type heat molten type bonding agent (softening point is about 100 ℃ for AK-1, Kanebo NSC (strain) system) with about 40g/m
2Coating amount spraying be applied on the two sides on the positive pole (or negative pole).
Positive pole (or negative pole) and negative pole (or anodal) are stacked together, and every 5cm is folding once also to reel to form reel structure.With the structure that obtains at about 100g/cm
2Pressure down pressurization obtain uniform thin type structure with bonded-electrode.
Then, the electrode body that obtains is inserted in the cylinder of being made by the aluminium stack membrane fully, and intensive drying, electrolyte injected afterwards.This electrolyte is with ethylene carbonate or 1, and the 2-dimethoxy-ethane is made solvent, makes electrolyte with lithium hexafluoro phosphate.After injecting electrolyte, with the sealing of aluminium stack membrane, the making of battery promptly comes to an end.
As the performance of the battery that makes thus, its weight energy density is 70Wh/kg at current value during for 1C.After charging under the current value C/2 200 times, charging capacity can be guaranteed to be initial 80%.
When the present invention is used for high-performance secondary cell such as portable electronic equipments such as hand-held computer, cordless telephones in manufacturing, can realize that small, lightization, shape change arbitrarily, and can simplify manufacturing equipment and boost productivity thus.
Claims (11)
1. the manufacture method of a lithium ion battery, this battery comprises the positive pole that is formed with positive electrode active material layer, the negative pole that is formed with negative electrode active material layer, and their are immersed in electrolyte, this method comprises the following steps:
Between positive pole and negative pole, partly stack the operation of the adhesive resin that comprises a part of plastic resin at least; And
Make the operation of above-mentioned adhesive resin distortion.
2. the manufacture method of lithium ion battery as claimed in claim 1 is characterized in that:
Make the adhesive resin distortion by applying the pressure or the bigger pressure that can make the plastic resin distortion.
3. the manufacture method of lithium ion battery as claimed in claim 1 is characterized in that:
Described plastic resin is a thermoplastic resin.
4. the manufacture method of lithium ion battery as claimed in claim 3 is characterized in that:
Make described adhesive resin distortion by heating.
5. the as claimed in claim 4 but manufacture method of ion battery is characterized in that:
The temperature of heating is more than the temperature that makes thermoplastic resin begin to flow.
6. the manufacture method of lithium ion battery as claimed in claim 3 is characterized in that:
Make described adhesive resin distortion by under the situation of pressurization, applying ultrasonic wave.
7. lithium ion battery, it is characterized in that having the laminate electrode body, this laminate electrode body comprises the positive pole with the positive electrode active material layer that links to each other with positive electrode collector, the negative pole with the negative electrode active material layer that links to each other with negative electrode collector and the adhesive resin that contains some moldable resin at least that disposes between described positive pole and described negative pole, form the space that is communicated with described positive pole and described negative pole therein by partly stacking this adhesive resin.
8. lithium ion battery as claimed in claim 7 is characterized in that:
Described plastic resin is a thermoplastic resin.
9. lithium ion battery as claimed in claim 7 is characterized in that:
The area in described space account for described positive pole and the opposed surface of described negative pole whole area 30～90%.
10. lithium ion battery as claimed in claim 7 is characterized in that: the distance between described positive pole and the described negative pole is below the 100 μ m.
11. lithium ion battery as claimed in claim 7 is characterized in that: have a plurality of laminate electrode bodies.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP98805155 | 1998-03-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1256800A CN1256800A (en) | 2000-06-14 |
| CN1128482C true CN1128482C (en) | 2003-11-19 |
Family
ID=29433261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98805155A Expired - Fee Related CN1128482C (en) | 1998-03-17 | 1998-03-17 | Lithium ion battery and method of manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1128482C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105765008A (en) * | 2013-11-13 | 2016-07-13 | R.R.当纳利父子公司 | Battery |
-
1998
- 1998-03-17 CN CN98805155A patent/CN1128482C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105765008A (en) * | 2013-11-13 | 2016-07-13 | R.R.当纳利父子公司 | Battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1256800A (en) | 2000-06-14 |
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