CN107482222A - Combined conductive agent, electrodes of lithium-ion batteries and lithium ion battery - Google Patents

Combined conductive agent, electrodes of lithium-ion batteries and lithium ion battery Download PDF

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Publication number
CN107482222A
CN107482222A CN201710792812.8A CN201710792812A CN107482222A CN 107482222 A CN107482222 A CN 107482222A CN 201710792812 A CN201710792812 A CN 201710792812A CN 107482222 A CN107482222 A CN 107482222A
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CN
China
Prior art keywords
lithium
pole piece
conductive agent
lithium ion
parts
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CN201710792812.8A
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Chinese (zh)
Inventor
柳青
林�建
陈辉
宋华杰
易先文
梁庆生
孙云龙
席利华
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Shenzhen Bak Battery Co Ltd
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Shenzhen Bak Battery Co Ltd
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Priority to CN201710792812.8A priority Critical patent/CN107482222A/en
Publication of CN107482222A publication Critical patent/CN107482222A/en
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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • 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
    • H01M4/139—Processes of manufacture
    • 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

Abstract

The invention discloses a kind of new combined conductive agent, utilize lithium ion anode pole piece and cathode pole piece made of the combined conductive agent and the lithium ion battery comprising above-mentioned anode pole piece and cathode pole piece, by introducing NEW TYPE OF COMPOSITE conductive agent, surface is can be made into the case where adding the conductive agent on a small quantity has the pole piece of flourishing effective conductive network so that made lithium ion has excellent multiplying power discharging, low temperature discharge, high temperature storage and cycle performance.Heretofore described combined conductive agent includes single wall or few-wall carbon nanotube and graphene nanometer sheet；The specific surface area of the single wall or few-wall carbon nanotube is 200 1500m2/ g, caliber are 1 10nm, and length of tube is more than 5 μm；A diameter of 0.2 2 μm of the graphene nanometer sheet, specific surface area are less than 1800 m2/ g, thickness are less than 2nm.

Description

Combined conductive agent, electrodes of lithium-ion batteries and lithium ion battery
Technical field
The invention belongs to field of lithium ion battery, and in particular to a kind of combined conductive agent applied to lithium ion battery and its Preparation method, lithium ion positive and negative plate and preparation method thereof, and the lithium-ion electric comprising above-mentioned combined conductive agent and pole piece Pond.
Background technology
The both positive and negative polarity of lithium ion battery is mainly made up of active material, conductive agent, thickener, binding agent and collector. Wherein positive active material is transition metal oxide or transition metal phosphate, and they are semiconductor or insulator, are led It is electrically poor, it is necessary to add conductive agent to improve electric conductivity；The electric conductivity of negative electrode active material is slightly good, but in multiple charge and discharge In electricity, dilation periodically bigger than positive active material can be undergone, reduces the contact between active material, gap increase, Even some depart from colelctor electrodes, turn into dead active material and are no longer participate in electrode reaction, are protected so being also required to add conductive agent Hold the stabilization of the negative electrode active material electric conductivity in cyclic process.
With the fast development of electric automobile, requirement of the electrokinetic cell industry to positive and negative pole material steps up, traditional phosphorus Sour iron lithium material and graphite cathode material have been difficult to reach electronic riding vehicle development in energy density and course continuation mileage etc. Demand.Nickelic tertiary cathode material and silicon based anode material meet pure electric passenger vehicle application with its higher energy density Trend.But nickelic ternary material particle substantial amounts of crack, or even appearance can occur along the crystal boundary of primary particle after cycling Grain is broken, expands positive pole, causes electrolyte largely to consume with side reactions such as stylish material/electrolyte interface film forming. There is crack in material and the broken rear contact with conductive agent is deteriorated, and positive pole load transfer impedance increases sharply, when ultimately resulting in circulation Battery polarization increases, and battery capacity decays in circulation.Similarly, silicon grain can be by crystalline state during Lithium-ion embeding It is changed into amorphous state, during lithium ion abjection, silicon grain is changed into crystalline state by amorphous state again.Lithium-ion embeding is deviate from Make the drastically breathing of silicon grain volume, strong stress causes silicon grain that efflorescence occurs, and the silica flour of efflorescence has quite a few can not Contacted with conductive agent, the lithium in this part silica flour can not be deviate from electric discharge, so as to cause very big irreversible appearance of discharging first Amount, reduces cycle performance.Using common conductive agent material (the gentle interpromoting relation in five elements of electrically conductive graphite, conductive black, multi-walled carbon nanotube Long carbon fiber) also it is difficult to be formed more flourishing effective conductive network even if increasing usage amount, and it is difficult to give full play to both The premium properties of novel positive and negative pole material.So searching out, a kind of energy forms flourishing effectively conductive network and addition is again few Conductive agent is the difficult point of the technical field.
The content of the invention
In order to solve the deficiencies in the prior art, answered the invention provides a kind of new combined conductive agent, using this Close lithium ion anode pole piece and cathode pole piece and the lithium ion comprising above-mentioned anode pole piece and cathode pole piece made of conductive agent Battery.By introducing NEW TYPE OF COMPOSITE conductive agent in the present invention, surface tool is can be made into the case where adding the conductive agent on a small quantity There is the pole piece of effective conductive network of prosperity, so as to improve the energy density of lithium battery and every chemical property.
The technique effect of the invention to be reached is realized by following scheme：
The combined conductive agent provided in the present invention includes single wall or few-wall carbon nanotube and graphene nanometer sheet；The single wall or The specific surface area of person's few-wall carbon nanotube is 200-1500m2/ g, caliber 1-10nm, length of tube are more than 5 μm；The graphene A diameter of 0.2-2 μm of nanometer sheet, specific surface area are less than 1800 m2/ g, thickness are less than 2nm.
A kind of method for preparing above-mentioned combined conductive agent is also provided in the present invention：By single wall or few-wall carbon nanotube, graphite Alkene nanometer sheet and dispersant are added in diluent, fully dispersed to produce；The dispersant is polyvinylpyrrolidone, gathered partially One kind in PVF or sodium carboxymethylcellulose, the diluent is 1-METHYLPYRROLIDONE, DMF, N, One kind in N- dimethyl acetamides, dimethyl sulfoxide (DMSO) or water；
The mass fraction of the combined conductive agent component is：
Single wall or few-wall carbon nanotube 0.05-5 parts
Graphene nanometer sheet 0.05-5 parts
Dispersant 0.1-1 parts
100 parts of diluent.
Single wall or few-wall carbon nanotube in combined conductive agent of the present invention, retaining multi-walled carbon nanotube superelevation electrical conductivity On the basis of, because its caliber is thinner（1-10nm）, draw ratio it is bigger（>1000:1）And bigger specific surface area（200- 1500m2/g）, only need minimal amount of addition to strengthen the long-range electron conduction between active material particle in pole piece.By It is limited in the contact point of single wall or few-wall carbon nanotube and single active particle, received so introducing graphene again on this basis Rice piece, graphene nanometer sheet can be adsorbed in active material particle surface, and avtive spot is interrelated, so as to enhance short distance Electronics is conducted, and the long-range electron conducting networks that can be formed with single wall or few-wall carbon nanotube are effectively docked, two kinds Material, which cooperates, make it that the conductive network in pole piece is very flourishing.By adding a small amount of NEW TYPE OF COMPOSITE conductive agent, lived in increase Property material can also lift pole piece compaction density in pole piece while content so that and the energy density of pole piece is effectively lifted, Fundamentally avoid the high situation for bringing side reaction more notable with electrolyte to influence of conventional conductive agent specific surface area.
A kind of anode slice of lithium ion battery for including above-mentioned combined conductive agent, including anode collection are also provided in the present invention Body and the active coating coated on plus plate current-collecting body surface, the component and mass fraction of the active coating are：
Positive active material 90-110 parts
Combined conductive agent 0.1-2.0 parts
Binding agent 0.1-2.0 parts
Solvent 30-50 parts.
Further, the positive active material is stratiform cobalt acid lithium, 4V spinel lithium manganates, olivine-type ferrous phosphate Lithium, stratiform ternary nickle cobalt lithium manganate, stratiform ternary nickel cobalt lithium aluminate, stratiform lithium nickelate, layered lithium manganate, stratiform are lithium-rich manganese-based just Pole material, 5V spinel nickels LiMn2O4, olivine-type iron manganese phosphate for lithium, monoclinic form phosphoric acid vanadium lithium, polyanion fluorophosphoric acid vanadium One or more kinds of combinations in lithium, orthosilicate composite positive pole.
Above-mentioned positive active material is respectively provided with platform voltage height, the advantage such as unit gram volume height, wherein it is preferred that shape cobalt acid lithium, Stratiform ternary nickle cobalt lithium manganate, stratiform ternary nickel cobalt lithium aluminate, stratiform lithium nickelate, stratiform lithium-rich manganese-based anode material and 5V points are brilliant Stone nickel ion doped material.
Further, the binding agent is Kynoar, polytetrafluoroethylene (PTFE), tetrafluoroethylene-ethylene copolymer, tetrafluoro second Alkene-hexafluoropropene-vinylidene fluoride copolymers, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, perfluoroethylene-propylene, poly- three One or more kinds of combinations in fluorine vinyl chloride, polyvinyl fluoride.
Above-mentioned binding agent has more preferable alkali resistance, and higher cohesive force, more excellent processing characteristics, suitable swelling separates out and drop The characteristics such as few additive, wherein it is preferred that Kynoar and vinylidene TFE copolymer.
Further, the solvent be 1-METHYLPYRROLIDONE, DMF, N, N- diethylformamides, One kind in DMA, dimethyl sulfoxide (DMSO), cyclohexanone.
A kind of method for preparing above-mentioned lithium battery anode piece is provided in the present invention：By combined conductive agent, positive electrode active material Matter, binding agent and solvent are well mixed according to formula, and the electrocondution slurry that viscosity is 2000-5000cP is made；Electrocondution slurry is applied Plus plate current-collecting body tow sides are overlying on, are toasted, conductive layer is formed on plus plate current-collecting body surface, coats the positive pole pole after electrocondution slurry Piece thickness is 100-400 μm；Anode pole piece is rolled, anode pole piece thickness is reached 50-200 μm.
A kind of lithium ion battery negative electrode for including above-mentioned combined conductive agent, including negative pole currect collecting are also provided in the present invention Body and the active coating coated on negative current collector surface, the component and mass fraction of the active coating are：
Negative electrode active material 90-110 parts
Combined conductive agent 0.1-2.0 parts in claim 1
Thickener 0.1-2.0 parts
Binding agent 0.2-4.0 parts
Water 80-120 parts.
Further, the negative electrode active material is native graphite, Delanium, surface modified natural graphite, compound people Make graphite, carbonaceous mesophase spherules, mesophase pitch-based carbon fibers, soft carbon, hard carbon, polysilicon nanometer particle, silicon-base alloy powder, oxygen Change one or more kinds of combinations in sub- silicon micron particles, lithium titanate.
Above-mentioned negative electrode active material has that platform voltage is low, the feature such as unit gram volume height, wherein it is preferred that polysilicon nanometer Particle, silicon-base alloy powder and the sub- silicon micron particles of oxidation.
Further, the thickener is sodium carboxymethylcellulose, Sodium Polyacrylate, sodium alginate, gelatin, pectin, melon It is a kind of or more in your bean gum, locust bean gum, diutan, xanthans, gellan gum, welan gum, glucan, agar, carragheen The combination of kind.
Above-mentioned thickener has the spies such as thickening property is strong, thixotropy is good, good leveling property, pH value wide adaptation range, stability are good Point.Wherein preferably carboxymethyl cellulose sodium, polyacrylic acid, carboxymethyl cellulose lithium and Lithium polyacrylate.
Further, the binding agent be butadiene-styrene rubber, neoprene, nitrile rubber, polyacrylate and its copolymer, Polyvinyl acetate and its copolymer, polyvinyl alcohol, polyacrylamide, polyacrylonitrile, polyimides, polyurethane, epoxy resin, One or more kinds of combinations in phenolic resin, unsaturated polyester resin.
Above-mentioned binding agent have cause negative material between and negative material and copper pool between bonding force it is more preferable, negative pole Roll-in not roll banding after drying, thickness bounce-back is stable after the negative plate roll-in of coating, long-term use of and negative plate is swollen during shelving Swollen small excellent properties.Wherein, preferably butadiene-styrene rubber and polyacrylate and its copolymer.
A kind of method for preparing above-mentioned lithium battery cathode pole piece is provided in the present invention：By combined conductive agent, negative electrode active material Matter, thickener, binding agent and water are well mixed according to formula, and the electrocondution slurry that viscosity is 1000-4000cP is made；By conductive paste Material is coated on negative current collector tow sides, toasts, and conductive layer is formed on negative current collector surface, coats negative after electrocondution slurry Pole pole piece thickness is 100-400 μm；Cathode pole piece is rolled, cathode pole piece thickness is reached 50-200 μm.
A kind of lithium ion battery, including anode pole piece, cathode pole piece, battery diaphragm and electrolyte are also provided in the present invention, The anode pole piece is anode pole piece in the present invention, and the cathode pole piece is cathode pole piece in the present invention.
Further, the plus plate current-collecting body in the anode pole piece be aluminium foil or coat conductive carbon layer aluminium foil, it is described Negative current collector in cathode pole piece is copper foil or the copper foil of coating conductive carbon layer.
Further, the solvent of the electrolyte is ethylene carbonate, propene carbonate, butylene, carbonic acid diformazan Ester, diethyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, propionic acid In ethyl ester, propyl propionate, methyl butyrate, ethyl butyrate, gamma-butyrolacton, δ-valerolactone, dimethoxy-ethane, acetonitrile, sulfolane One or more kinds of combinations；The solute of the electrolyte is lithium hexafluoro phosphate, LiBF4, di-oxalate lithium borate, two Fluorine Lithium bis (oxalate) borate, lithium perchlorate, bis trifluoromethyl sulfimide lithium, double fluorine sulfimide lithiums, lithium carbonate, lithium fluoride, high chlorine One or more kinds of combination in sour lithium.
It is preferred that the solvent of electrolyte is ethylene carbonate, propene carbonate, diethyl carbonate, dimethyl carbonate, carbonic acid first Ethyl ester, high, the electrochemically stable potential range of above-mentioned electrolyte solvent ionic conductivity is wide, use temperature range is wide and battery Chemical reaction does not occur for interior collector and active material, can be biodegradable.It is preferred that the solute of electrolyte is lithium hexafluoro phosphate, four Lithium fluoroborate, di-oxalate lithium borate, difluorine oxalic acid boracic acid lithium, lithium trifluoromethanesulp,onylimide and double fluorine sulfimide lithiums.These Electrolyte solute has preferable electrical conductivity, heat endurance and oxidative resistance.
Further, the electrolyte includes additive, and the additive is vinylene carbonate, in 1,3- propane sulfonic acids Ester, fluorinated ethylene carbonate, trifluoromethyl ethylene carbonate, vinyl ethylene carbonate, sulfuric acid vinyl ester, methylsulfuric acid ethene Ester, sulfuric acid propylene, ethylene sulfite, biphenyl, Biphenyl Ether, cyclohexylbenzene, succinic anhydride, succinonitrile, dintrile, penta 2 Nitrile, toluene, dimethylbenzene, fluorobenzene, p-fluorotoluene, p-Fluoroanisole, tert-butyl benzene, tert-amyl benzene, difluoro ethylene carbonate, propylene Sultones, butane sultones, methane-disulfonic acid methylene ester, ethylene glycol are double（Propionitrile）Ether, fluorine-containing ether, the silicon nitrogen of hexamethyl two Alkane, dimethyl methyl phosphonate, diethyl ethylphosphate, trimethyl phosphate, triphenyl phosphate, triphenyl phosphite, three（Trimethyl Silicon substrate）Borate, three（Trimethyl silicon substrate）One or more kinds of combination in phosphate, the phosphonitrile of hexafluoro ring three.
It is preferred that the additive of electrolyte is vinylene carbonate, sulfuric acid vinyl ester, methylsulfuric acid vinyl acetate, sulfuric acid propylene Ester, ethylene sulfite, toluene, dimethylbenzene, ethylene sulfite, propylene sulfite, dimethyl sulfite, sulfurous acid diethyl Ester, fluorinated ethylene carbonate, thiocyanates, isothiocyanates, tributyl phosphate, trioctyl phosphate.Above-mentioned additive agent electrolyte Can improve both positive and negative polarity SEI film properties, improve electrolyte overcharge with high voltage withstanding performance, improve electrolyte low temperature and high temperatures Acid and water content in electrolyte heat endurance, control electrolyte, can be improved, improve wetability between electrolyte and electrode surface.
Further, described -20 DEG C of low temperature performances of lithium ion battery are more than more than 70%, 3C multiplying power discharging properties 80%, 60 DEG C storage 28 days after capability retention be more than 90%, capacity restoration rate be more than 95%.
The present invention has advantages below：
1st, the invention provides a kind of new combined conductive agent, using lithium ion anode pole piece made of the combined conductive agent and Cathode pole piece and the lithium ion battery comprising above-mentioned anode pole piece and cathode pole piece, by introducing NEW TYPE OF COMPOSITE conductive agent, Surface is can be made into the case of adding the conductive agent on a small quantity has the pole piece of flourishing effective conductive network so that made Lithium ion has excellent multiplying power discharging, low temperature discharge, high temperature storage and cycle performance.
2nd, the present invention is by adding a small amount of NEW TYPE OF COMPOSITE conductive agent, while active material content in pole piece is increased also Pole piece compaction density can be lifted so that the energy density of pole piece is effectively lifted, and fundamentally avoids conventional conductive agent ratio Surface area height brings the situation that side reaction more notable with electrolyte influences.
Brief description of the drawings
Fig. 1 is lithium ion battery and comparative example lithium ion battery normal-temperature circulating performance test chart in the present invention.
Embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
1st, the preparation of combined conductive agent
Combined conductive agent is prepared according to component in following table and constitutive property：
The preparation method of combined conductive agent is in the present embodiment：By single wall or few-wall carbon nanotube, graphene nanometer sheet and divide Powder is added in diluent, and the mass fraction of component addition is：2 parts of 100 parts of diluent, single wall or few-wall carbon nanotube, stone Black 2 parts of alkene nanometer sheet, 0.55 part of dispersant are fully dispersed to produce；Dispersant is sodium carboxymethylcellulose, and diluent is N- methyl Pyrrolidones.
Selection numbering prepares the battery pole piece in the present embodiment for the combined conductive agent of No. 3.Select No. 3 combined conductive agents Reason can cause inside battery side reaction to increase one is CNT caliber is too thin, specific surface area is too big, length of tube is oversize Add, and CNT caliber is too thick, specific surface area is too small, the too short performance that can cause battery of length of tube cannot be lifted fully； The second is graphene nanometer sheet diameter is too big, specific surface area is small, the too thick performance that can not be effectively increased battery of thickness, graphene is received Rice piece diameter is too small, specific surface area is big, thickness is too thin can cause inside battery side reaction to greatly increase.No. 3 combined conductive agents are Meet the optimal combined conductive agent of the performance of above-mentioned requirements.
2nd, in the present embodiment anode pole piece according to the preparation of component in following table and constituent mass than carrying out anode pole piece：
Anode pole piece preparation method is in embodiment and comparative example：By combined conductive agent, positive active material, binding agent and solvent It is well mixed according to formula, the electrocondution slurry that viscosity is 4000cP is made；Electrocondution slurry is coated on plus plate current-collecting body positive and negative two Face, baking, conductive layer is formed on plus plate current-collecting body surface, it is 250 μm to coat the anode pole piece thickness after electrocondution slurry；Roll just Pole pole piece, anode pole piece thickness is set to reach 150 μm.Plus plate current-collecting body selected in the present embodiment is aluminium foil.
3rd, in the present embodiment anode pole piece according to the preparation of component in following table and constituent mass than carrying out cathode pole piece：
The preparation method of cathode pole piece is：By combined conductive agent, negative electrode active material, thickener, binding agent and water according to formula It is well mixed, the electrocondution slurry that viscosity is 3000cP is made；Electrocondution slurry is coated on negative current collector tow sides, toasted, Conductive layer is formed on negative current collector surface, it is 250 μm to coat the cathode pole piece thickness after electrocondution slurry；Roll cathode pole piece, Cathode pole piece thickness is set to reach 150 μm.Plus plate current-collecting body selected in the present embodiment is copper foil.
4th, the preparation of lithium ion battery
Conductive lug will be welded on above-mentioned anode pole piece P and negative plate N, polypropylene, polyethylene composite isolated film is positioned over just Among pole piece and negative plate, it is wrapped in after being wound into naked battery core in aluminum plastic film.Injection by lithium salts, mixed carbonic acid ester solvent with And the electrolyte that additive is formed.Battery is melted into after being packaged and aging obtains flexible-packed battery, is designated as C（Just Pole pole piece P1, which corresponds to cathode pole piece N1 and battery C1, P2 is made corresponds to N2, is made battery C2, by that analogy, comparative example anode pole piece pair Answer comparative example cathode pole piece that comparative example battery is made）.
5th, test and test result contrast
（One）Low temperature performance is tested
It is straight with 1.0C current discharge to the battery of charging in 25 DEG C of current versus cell chargings using 0.5C until voltage is 4.2V To 2.5V, this discharge capacity is designated as the discharge capacity at 25 DEG C；Equally in 25 DEG C of current versus cell chargings with 0.5C until electricity Press as 4.2V, respectively in 0 DEG C, -10 DEG C and -20 DEG C to the battery of charging with 1.0C current discharge until 2.5V, this electric discharge are held Amount is designated as the discharge capacity at 0 DEG C, -10 DEG C and -20 DEG C respectively.Discharge capacity at 0 DEG C, -10 DEG C and -20 DEG C and electricity at 25 DEG C 0 DEG C, -10 DEG C and -20 DEG C discharge capacity ratio of the percentage of discharge capacity first in pond as battery, test result refer to table 1.
The lithium ion battery low temperature performance of the embodiment of table 1 and comparative example
From test result, the lithium ion battery low temperature performance in the present embodiment is more excellent than lithium ion battery in comparative example Good, under the conditions of -20 DEG C, discharge performance maintains more than 70%, and comparative example battery is only 53.39%.
（Two）Multiplying power discharging property is tested
It is straight with 0.5C current discharge to the battery of charging in 25 DEG C of current versus cell chargings using 0.5C until voltage is 4.2V To 2.5V, this discharge capacity is designated as 0.5C discharge capacity；Equally in 25 DEG C of current versus cell chargings with 0.5C until voltage For 4.2V, respectively to the battery of charging in 25 DEG C of current discharges with 1C, 2C and 3C until 2.5V, this discharge capacity are remembered respectively For the discharge capacity under 1C, 2C and 3C.Discharge capacity under 1C, 2C and 3C and battery 0.5C first discharge capacity percentage are compared to For 1C, 2C and 3C discharge capacity ratio of battery, test result refers to table 2.
The lithium ion battery multiplying power discharging property of the embodiment of table 2 and comparative example
From test result, the lithium ion battery multiplying power discharging property in the present embodiment is more excellent than lithium ion battery in comparative example Good, under 3C discharging conditions, discharge performance maintains more than 80%, and comparative example battery is only 72.09%.
（Three）High-temperature storage performance contrasts
It is straight with 1.0C current discharge to the battery of charging in 25 DEG C of current versus cell chargings using 0.5C until voltage is 4.2V To 2.5V, this discharge capacity is designated as discharge capacity first；At 25 DEG C equally using the charging of 0.5C current versus cell until voltage as 4.2V, be placed on after shelving 28 days in 60 DEG C of environment, then to the battery after shelving in 25 DEG C of current discharges with 1.0C until 2.5V, this discharge capacity are designated as the discharge capacity kept respectively.Then in 25 DEG C of current versus cell chargings with 0.5C until electricity Press as 4.2V, to the battery of charging with 1.0C current discharge until 2.5V, this discharge capacity are designated as the discharge capacity recovered；Protect Capacity guarantor of the discharge capacity and the discharge capacity of recovery held and battery 1.0C first the discharge capacity percentage as battery Holdup and capacity restoration rate, test result refer to table 3.
The high-temperature storage performance of lithium ion battery of the embodiment of table 3 and comparative example
From test result, 60 DEG C/28D of the lithium ion battery in the present embodiment capability retention is averagely more than 90%, and 60 DEG C/28D of the lithium ion battery of comparative example capability retention is only 84.78%；60 of lithium ion battery in embodiment DEG C/28D capacity restoration rate more than 95%, and 60 DEG C/28D of lithium ion battery capacity restoration rate is only in comparative example 90.89%, it is obvious that the lithium ion battery that the embodiment of the present invention one provides has more preferable high-temperature storage performance.
（Four）Normal-temperature circulating performance is tested
Using the charging of 1C current versus cell until voltage is 4.2V at 25 DEG C, to the battery of charging with 1C current discharge until 2.5V, recharge discharge cycles 400 times；In cyclic process record battery discharge capacity, with the discharge capacity of the 400th time with First time discharge capacity percentage is as capability retention, embodiment C1 and the comparative example detailed such as accompanying drawing 1 of test result.
From Figure of description 1, in normal temperature circulation test, capability retention is embodiment C1 lithium ion battery 97.82%, and the respective volume conservation rate of the lithium ion battery of comparative example is only 92.56%.Obviously, embodiment C1 lithium-ion electric Pond has more preferable cycle performance.In view of performance of lithium ion battery provided in an embodiment of the present invention has good homogeneity and steady It is qualitative, it is obvious that the lithium ion battery provided in the embodiment of the present invention has more preferable normal-temperature circulating performance.
It is last it should be noted that above example is only illustrating the technical scheme of the embodiment of the present invention rather than it is entered Row limitation, although the embodiment of the present invention is described in detail with reference to preferred embodiment, one of ordinary skill in the art It should be understood that can still be modified to the technical scheme of the embodiment of the present invention or equivalent substitution, and these modifications or wait The scope of amended technical scheme disengaging technical scheme of the embodiment of the present invention can not also be made with replacement.

Claims (10)

  1. A kind of 1. combined conductive agent, it is characterised in that：
    The combined conductive agent includes single wall or few-wall carbon nanotube and graphene nanometer sheet；
    The specific surface area of the single wall or few-wall carbon nanotube is 200-1500m2/ g, caliber 1-10nm, length of tube are more than 5 μ m；A diameter of 0.2-2 μm of the graphene nanometer sheet, specific surface area are less than 1800 m2/ g, thickness are less than 2nm.
  2. A kind of 2. method for preparing combined conductive agent as claimed in claim 1, it is characterised in that：By single wall or few wall carbon nano-tube Pipe, graphene nanometer sheet and dispersant are added in diluent, fully dispersed to produce；The dispersant is polyvinylpyrrolidine One kind in ketone, Kynoar or sodium carboxymethylcellulose, the diluent is 1-METHYLPYRROLIDONE, N, N- dimethyl methyls One kind in acid amides, DMA, dimethyl sulfoxide (DMSO) or water；
    The mass fraction of the combined conductive agent component is：
    Single wall or few-wall carbon nanotube 0.05-5 parts
    Graphene nanometer sheet 0.05-5 parts
    Dispersant 0.1-1 parts
    100 parts of diluent.
  3. 3. a kind of anode slice of lithium ion battery, including plus plate current-collecting body and the activity painting coated on plus plate current-collecting body surface Layer, it is characterised in that the component and mass fraction of the active coating be：
    Positive active material 90-110 parts
    Combined conductive agent 0.1-2.0 parts in claim 1
    Binding agent 0.1-2.0 parts
    Solvent 30-50 parts.
  4. 4. anode slice of lithium ion battery as claimed in claim 3, it is characterised in that：The positive active material is stratiform cobalt acid Lithium, 4V spinel lithium manganates, olivine-type LiFePO 4, stratiform ternary nickle cobalt lithium manganate, stratiform ternary nickel cobalt lithium aluminate, layer Shape lithium nickelate, layered lithium manganate, stratiform lithium-rich manganese-based anode material, 5V spinel nickels LiMn2O4, olivine-type iron manganese phosphate for lithium, One or more kinds of groups in monoclinic form phosphoric acid vanadium lithium, polyanion fluorophosphoric acid vanadium lithium, orthosilicate composite positive pole Close；
    Preferably, the binding agent is Kynoar, polytetrafluoroethylene (PTFE), tetrafluoroethylene-ethylene copolymer, tetrafluoroethene-six Fluoropropene-vinylidene fluoride copolymers, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, perfluoroethylene-propylene, poly- trifluoro chloroethene One or more kinds of combinations in alkene, polyvinyl fluoride；
    Preferably, the solvent be 1-METHYLPYRROLIDONE, DMF, N, N- diethylformamides, N, N- bis- One kind in methylacetamide, dimethyl sulfoxide (DMSO), cyclohexanone.
  5. A kind of 5. method for preparing the lithium battery anode piece as described in claim 3-4 is any, it is characterised in that：By composite conducting Agent, positive active material, binding agent and solvent are well mixed according to formula, and the electrocondution slurry that viscosity is 2000-5000cP is made； Electrocondution slurry is coated on plus plate current-collecting body tow sides, toasted, conductive layer is formed on plus plate current-collecting body surface, coats conductive paste Anode pole piece thickness after material is 100-400 μm；Anode pole piece is rolled, anode pole piece thickness is reached 50-200 μm.
  6. 6. a kind of lithium ion battery negative electrode, including negative current collector and the activity painting coated on negative current collector surface Layer, it is characterised in that the component and mass fraction of the active coating be：
    Negative electrode active material 90-110 parts
    Combined conductive agent 0.1-2.0 parts in claim 1
    Thickener 0.1-2.0 parts
    Binding agent 0.2-4.0 parts
    Water 80-120 parts.
  7. 7. lithium ion battery negative electrode as claimed in claim 6, it is characterised in that：The negative electrode active material is natural stone It is ink, Delanium, surface modified natural graphite, composite artificial graphite, carbonaceous mesophase spherules, mesophase pitch-based carbon fibers, soft One or more kinds of groups in carbon, hard carbon, polysilicon nanometer particle, silicon-base alloy powder, the sub- silicon micron particles of oxidation, lithium titanate Close；
    Preferably, the thickener be sodium carboxymethylcellulose, Sodium Polyacrylate, sodium alginate, gelatin, pectin, guar gum, One or more kinds of groups in locust bean gum, diutan, xanthans, gellan gum, welan gum, glucan, agar, carragheen Close；
    Preferably, the binding agent is butadiene-styrene rubber, neoprene, nitrile rubber, polyacrylate and its copolymer, poly-vinegar acid Vinyl acetate and its copolymer, polyvinyl alcohol, polyacrylamide, polyacrylonitrile, polyimides, polyurethane, epoxy resin, phenolic aldehyde tree One or more kinds of combinations in fat, unsaturated polyester resin.
  8. A kind of 8. method for preparing the lithium ion battery negative electrode as described in claim 6-7 is any, it is characterised in that：Will be compound Conductive agent, negative electrode active material, thickener, binding agent and water are well mixed according to formula, and it is 1000-4000cP's that viscosity, which is made, Electrocondution slurry；Electrocondution slurry is coated on negative current collector tow sides, toasted, conductive layer is formed on negative current collector surface, It is 100-400 μm to coat the cathode pole piece thickness after electrocondution slurry；Cathode pole piece is rolled, cathode pole piece thickness is reached 50-200 μm。
  9. 9. a kind of lithium ion battery, including anode pole piece, cathode pole piece, battery diaphragm and electrolyte, it is characterised in that：It is described just Pole pole piece is the anode pole piece as described in claim 3-4 is any, and the cathode pole piece is the negative pole as described in claim 6-7 is any Pole piece.
  10. 10. lithium ion battery as claimed in claim 9, it is characterised in that：Plus plate current-collecting body in the anode pole piece is aluminium foil Or the aluminium foil of conductive carbon layer is coated, the negative current collector in the cathode pole piece is copper foil or the copper of coating conductive carbon layer Paper tinsel；
    Preferably, the solvent of the electrolyte is ethylene carbonate, propene carbonate, butylene, dimethyl carbonate, carbonic acid Diethylester, methyl ethyl carbonate, methyl propyl carbonate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, third One kind in propyl propionate, methyl butyrate, ethyl butyrate, gamma-butyrolacton, δ-valerolactone, dimethoxy-ethane, acetonitrile, sulfolane Or a variety of combination；The solute of the electrolyte is lithium hexafluoro phosphate, LiBF4, di-oxalate lithium borate, difluoro oxalate In lithium borate, lithium perchlorate, bis trifluoromethyl sulfimide lithium, double fluorine sulfimide lithiums, lithium carbonate, lithium fluoride, lithium perchlorate One or more kinds of combinations；
    Preferably, the electrolyte includes additive, and the additive is vinylene carbonate, 1,3- propane sultones, fluorine For ethylene carbonate, trifluoromethyl ethylene carbonate, vinyl ethylene carbonate, sulfuric acid vinyl ester, methylsulfuric acid vinyl acetate, sulphur Acid propylene ester, ethylene sulfite, biphenyl, Biphenyl Ether, cyclohexylbenzene, succinic anhydride, succinonitrile, dintrile, glutaronitrile, first Benzene, dimethylbenzene, fluorobenzene, p-fluorotoluene, p-Fluoroanisole, tert-butyl benzene, tert-amyl benzene, difluoro ethylene carbonate, propene sulfonic acid Lactone, butane sultones, methane-disulfonic acid methylene ester, ethylene glycol are double（Propionitrile）Ether, fluorine-containing ether, HMDS, first Base dimethyl phosphonate, diethyl ethylphosphate, trimethyl phosphate, triphenyl phosphate, triphenyl phosphite, three（Trimethyl silicon substrate） Borate, three（Trimethyl silicon substrate）One or more kinds of combination in phosphate, the phosphonitrile of hexafluoro ring three；
    Preferably, described -20 DEG C of low temperature performances of lithium ion battery are more than 70%, 3C multiplying power discharging properties more than 80%, 60 DEG C Capability retention is more than 90% after storing 28 days, and capacity restoration rate is more than 95%.
CN201710792812.8A 2017-09-05 2017-09-05 Combined conductive agent, electrodes of lithium-ion batteries and lithium ion battery Pending CN107482222A (en)

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