CN109659564A - A kind of negative electrode tab and preparation method thereof reducing lithium ion battery impedance - Google Patents
A kind of negative electrode tab and preparation method thereof reducing lithium ion battery impedance Download PDFInfo
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- CN109659564A CN109659564A CN201811582875.1A CN201811582875A CN109659564A CN 109659564 A CN109659564 A CN 109659564A CN 201811582875 A CN201811582875 A CN 201811582875A CN 109659564 A CN109659564 A CN 109659564A
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- negative electrode
- electrode tab
- ion battery
- lithium ion
- lithium
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 50
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 51
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 51
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 44
- 239000002002 slurry Substances 0.000 claims abstract description 36
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 33
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 33
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 33
- 239000006258 conductive agent Substances 0.000 claims abstract description 17
- 239000011267 electrode slurry Substances 0.000 claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 16
- 239000002904 solvent Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 239000011889 copper foil Substances 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 9
- 238000005530 etching Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000004513 sizing Methods 0.000 abstract 1
- 238000003756 stirring Methods 0.000 description 21
- 239000002253 acid Substances 0.000 description 18
- 229910017052 cobalt Inorganic materials 0.000 description 18
- 239000010941 cobalt Substances 0.000 description 18
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical group [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 18
- 238000001291 vacuum drying Methods 0.000 description 17
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 11
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 11
- 238000007796 conventional method Methods 0.000 description 9
- SMBQBQBNOXIFSF-UHFFFAOYSA-N dilithium Chemical compound [Li][Li] SMBQBQBNOXIFSF-UHFFFAOYSA-N 0.000 description 9
- 239000011244 liquid electrolyte Substances 0.000 description 9
- 238000004804 winding Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000004744 fabric Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000007774 positive electrode material Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000037427 ion transport Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical class [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Composite Materials (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
A kind of negative electrode tab and preparation method thereof reducing lithium ion battery impedance, belongs to field of lithium ion battery.The negative electrode tab includes collector, conductive layer, negative electrode layer, and carboxymethyl cellulose lithium is contained in conductive layer and negative electrode layer.Preparation method includes the following steps: that by carboxymethyl cellulose lithium, conductive agent, binder, solvent, which is sufficiently stirred, is configured to uniform sizing material, electrocondution slurry is uniformly coated to collection liquid surface, drying obtains conductive layer.Negative electrode slurry containing carboxymethyl cellulose lithium is coated in conductive layer surface, negative electrode layer is obtained after drying, obtains negative electrode tab.The present invention between negative electrode layer and collector by being added one layer of conductive layer, while increasing pole piece cohesive force, electric conductivity is more preferable, carboxymethyl cellulose lithium is added in conductive layer and negative electrode layer simultaneously, effectively improve the efficiency of transmission of lithium, to greatly reduce battery impedance, and have some improvement to circulation and for the first time formation efficiency.
Description
Technical field
The invention belongs to technical field of lithium ion more particularly to it is a kind of reduce lithium ion battery impedance negative electrode tab and
Preparation method.
Background technique
Lithium ion battery as novel high-energy battery, in recent years people to its research and development achieve it is important into
Exhibition.With the attention of people's environmentally friendly industry, electric car is increasingly had been favored by people, and country also puts into effect various
Electric car industry is helped in the policy of form, subsidy.Higher requirement thus is proposed for power battery, it is one of to refer to
Mark is exactly battery impedance requirement.
In addition, for electronic products such as communication equipment, laptop, digital cameras, on the one hand to battery energy density
It is required that higher and higher, corresponding pole piece compacting will be very high, how solve pole piece high-pressure solid high impedance bring cell dynamics
Poor problem becomes the problem that people primarily face；On the other hand very high requirement, Hen Duochang also proposed to battery rapid charging performance
Quotient includes the digital products such as mobile phone, pen electricity and power product proposes fast charge demand one after another, and quick charging battery most important one is wanted
Asking is exactly problem of temperature rise, is after all exactly battery impedance problem.
The prior art generally by the thickness for increasing collector or carries out modification improvement to collector, to reduce impedance,
As the application for a patent for invention of Publication No. CN108598361A forms one layer of copper-tin alloy using electro-plating method in collection liquid surface
Coating can be effectively improved pole piece dynamic performance, alleviate pole piece expansion, improve limited extent to battery impedance.Pass through increase
Afflux body thickness or reduction surface density can reduce lithium ion battery impedance, but can sacrifice a big chunk energy density, real
It is limited with property.
Summary of the invention
The purpose of the present invention is to solve existing battery impedance height, the problem that temperature rise is big, dynamics is poor, provide one kind
The negative electrode tab and preparation method thereof of lithium ion battery impedance is reduced, this kind of method can reduce negative electrode tab internal resistance, and then reduce electricity
Pond entirety internal resistance reduces battery charging and discharging temperature rise, improves cycle performance of lithium ion battery, improves battery first charge-discharge effect
Rate, to promote battery volume energy density.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of negative electrode tab reducing lithium ion battery impedance, the negative electrode tab includes collector, conductive layer and negative electrode layer, described
A side surface of collector be equipped with conductive layer, the surface of the conductive layer is equipped with negative electrode layer.
Further, the collector is one of copper foil, porous copper foil, etching copper foil.
Further, the thickness of the collector is less than 25 μm.
Further, the conductive layer with a thickness of 0.2 ~ 3 μm.
Further, the conductive layer the preparation method is as follows: by carboxymethyl cellulose lithium, conductive agent, binder and
Solvent is mixed, and obtains electrocondution slurry, electrocondution slurry is uniformly coated to one side surface of collector, vacuum bakeout obtains conduction
Layer.
Further, the negative electrode layer with a thickness of 10 ~ 200um.
Further, carboxymethyl cellulose lithium is added in the negative electrode layer, content is 0.05wt.% ~ 5wt.%.
A kind of preparation method of above-mentioned negative electrode tab, the method and step are as follows: by carboxymethyl cellulose lithium, conduction
Agent, binder and solvent are mixed, and obtaining solid content is 10% ~ 50%, and viscosity is less than the electrocondution slurry of 2000mPa.s, will lead
Plasma-based material is uniformly coated to one side surface of collector, and vacuum bakeout obtains conductive layer；Negative electrode slurry is stirred, keeps it sufficiently mixed
It closes, is then coated in conductive layer surface, obtain negative electrode layer, carry out vacuum bakeout, obtain negative electrode tab.
A kind of lithium ion battery containing above-mentioned negative electrode tab, the lithium ion battery include lithium ion cell positive
Piece, negative electrode tab.
The beneficial effect of the present invention compared with the existing technology is: on the one hand conductive layer of the invention can increase negative electrode tab leads
Electrically, impedance is reduced, on the other hand, cathode caking property can be increased, reduces pole piece expansion, carboxymethyl cellulose lithium therein exists
It improves on lithium ion transport efficiency basis, certain lithium source is provided for cathode, promote battery formation efficiency for the first time.Conductive layer surface
Negative electrode layer using carboxymethyl cellulose lithium replace traditional sodium carboxymethylcellulose make thickener, greatly reduce pole piece resistance
It is anti-, to the circulating battery effect of being greatly improved.Anode plate for lithium ionic cell preparation method of the invention is simple, and significant effect has
Effect improves battery performance.
Detailed description of the invention
Fig. 1 is the negative plate structure schematic diagram that the present invention reduces lithium ion battery impedance；
Fig. 2 is cycle performance curve graph of the battery of comparative example 1 and embodiment 1 ~ 5 of the present invention under the conditions of 25 DEG C；
Fig. 3 is cycle performance curve graph of the battery of comparative example 2 and embodiment 6 ~ 7 of the present invention under the conditions of 25 DEG C.
Specific embodiment
A specific embodiment of the invention is described in more detail below in conjunction with attached drawing, it is of the invention upper in order to allow
Stating can become apparent from other objects, features and advantages, make below by specific embodiment and comparative example to the present invention further
Explanation.Reagent, material and the instrument arrived used in following the description such as not special explanation, is conventional reagent, routine
Material and conventional instrument, commercially available, related reagent can also be synthesized by conventional synthesis process and be obtained.
Specific embodiment 1: as shown in Figure 1, present embodiment record is a kind of bearing for reduction lithium ion battery impedance
Pole piece, the negative electrode tab include collector 1, conductive layer 2 and negative electrode layer 3, and a side surface of the collector 1 is equipped with conduction
The surface of layer 2, the conductive layer 2 is equipped with negative electrode layer 3.
Specific embodiment 2: a kind of negative electrode tab of reduction lithium ion battery impedance, institute described in specific embodiment one
The collector 1 stated is one of copper foil, porous copper foil, etching copper foil.Conductive layer 2 is the coating containing conductive material, wherein
Carboxymethyl cellulose lithium make thickener and have certain caking property.
Specific embodiment 3: a kind of cathode of reduction lithium ion battery impedance described in specific embodiment one or two
Piece, the thickness of the collector 1 is configured from the point of view of energy density, less than 25 μm.
Specific embodiment 4: a kind of negative electrode tab of reduction lithium ion battery impedance, institute described in specific embodiment one
The conductive layer 2 stated with a thickness of 0.2 ~ 3 μm.
Specific embodiment 5: a kind of cathode of reduction lithium ion battery impedance described in specific embodiment one or four
Piece, the conductive layer 2 the preparation method is as follows: by carboxymethyl cellulose lithium, conductive agent, binder and solvent in planet stirring
5 ~ 8h is mixed in tank, mixes them thoroughly to obtain electrocondution slurry, electrocondution slurry is uniformly coated to 1 side table of collector
Face, 85 DEG C of vacuum bakeout 4h-8h obtain conductive layer 2 in a vacuum drying oven.
The effect of conductive agent is to increase pole piece electric conductivity, and lithium ion transport can be improved in carboxymethyl cellulose lithium, reduces impedance,
A small amount of lithium source can be provided again, the loss of irreversible lithium in battery charge and discharge process is reduced, be melted into for the first time to improve battery
Efficiency.The conductive agent includes but is not limited to superP, carbon nanotube, the conductive materials such as carbon black.The carboxymethyl is fine
It ties up plain lithium and replaces traditional sodium carboxymethylcellulose, for electrocondution slurry and the thickener of negative electrode slurry, pole piece entirety can be reduced
Impedance improves lithium ion transport efficiency.
In the conductive layer 2, the content of carboxymethyl cellulose lithium is 0.1wt.% ~ 10wt.%, and conductive agent content is
50wt.% ~ 75wt.%, binder content are 20wt.% ~ 40wt.%.The viscosity of the electrocondution slurry is less than 2000 mPa.s, slurry
Expect that solid content is 10% ~ 50%, specifically, is adjusted by solvent.
Specific embodiment 6: a kind of negative electrode tab of reduction lithium ion battery impedance, institute described in specific embodiment one
The negative electrode layer 3 stated with a thickness of 10 ~ 200um.
Specific embodiment 7: a kind of cathode of reduction lithium ion battery impedance described in specific embodiment one or six
Piece, carboxymethyl cellulose lithium is added in the negative electrode layer 3, and content is 0.05wt.% ~ 5wt.%.Specifically, in dispensing stage,
Carboxymethyl cellulose lithium and cathode powder are directly added into uniformly mixed together in planetary agitator tank.
Specific embodiment 8: the system of negative electrode tab described in a kind of any specific embodiment of specific embodiment one to seven
Preparation Method,
The method and step is as follows: carboxymethyl cellulose lithium, conductive agent, binder and solvent are mixed in planet agitator tank
5 ~ 8h is stirred, is mixed them thoroughly, obtaining solid content is 10% ~ 50%, and viscosity is less than the electrocondution slurry of 2000mPa.s, will be conductive
Slurry is uniformly coated to 1 one side surface of collector, and 85 DEG C of vacuum bakeout 4h ~ 8h obtain conductive layer 2 in a vacuum drying oven；It will bear
Pole slurry stirs 5 ~ 8h in planet agitator tank, mixes them thoroughly, and is then coated on 2 surface of conductive layer, obtains negative electrode layer,
Vacuum bakeout 12h ~ for 24 hours is carried out in 85 DEG C of vacuum oven, obtains negative electrode tab.
Specific embodiment 9: a kind of contain negative electrode tab described in any specific embodiment of specific embodiment one to seven
Lithium ion battery, the lithium ion battery includes based lithium-ion battery positive plate, negative electrode tab.The positive plate uses just
Pole active material is the conventional material that can be used as lithium ion cell positive containing lithium source.
Comparative example 1
When preparing negative electrode slurry, 2% sodium carboxymethylcellulose is added, 6h is stirred by the way of planet stirring, cathode slurry is made
Material, is coated onto collection liquid surface, obtains the negative electrode layer with a thickness of 120um, then toast 12h in a vacuum drying oven, most
Obtained negative electrode tab eventually.Positive plate is prepared using conventional method, the positive active material on positive plate is cobalt acid lithium, by above-mentioned gained
Negative electrode tab, cobalt acid lithium lithium positive plate, diaphragm use winding process, and lithium ion battery is made in collocation liquid electrolyte.
Comparative example 2
By 4% sodium carboxymethylcellulose, 68% conductive agent, 28% binder, solvent stirs 6h in planet agitator tank, makes it sufficiently
Mixed preparing contains 30% admittedly, and electrocondution slurry is uniformly coated on collector by viscosity in the electrocondution slurry of 500 ~ 1000mPa.s, applies
Cloth thickness 1.5um, then toasts 4h in a vacuum drying oven, obtains conductive layer.
When preparing negative electrode slurry, 2% sodium carboxymethylcellulose is added, 6h is stirred by the way of planet stirring, cathode is made
Slurry is coated onto conductive layer surface, obtains the negative electrode layer with a thickness of 120um, then toasts 12h in a vacuum drying oven,
Finally obtained negative electrode tab.Positive plate is prepared using conventional method, the positive active material on positive plate is cobalt acid lithium, by above-mentioned institute
It obtains negative electrode tab, cobalt acid lithium lithium positive plate, diaphragm and uses winding process, lithium ion battery is made in collocation liquid electrolyte.
Embodiment 1
By 4% carboxymethyl cellulose lithium, 68% conductive agent, 28% binder, solvent stirs 6h in planet agitator tank, makes it sufficiently
Mixed preparing contains 30% admittedly, and electrocondution slurry is uniformly coated on collector by viscosity in the electrocondution slurry of 500 ~ 1000mPa.s, applies
Cloth thickness 1.5um, then toasts 4h in a vacuum drying oven, obtains conductive layer.
When preparing negative electrode slurry, 2% carboxymethyl cellulose lithium is added, 6h is stirred by the way of planet stirring, cathode is made
Slurry is coated onto conductive layer surface, obtains the negative electrode layer with a thickness of 120um, then toasts 12h in a vacuum drying oven,
Finally obtained negative electrode tab.Positive plate is prepared using conventional method, the positive active material on positive plate is cobalt acid lithium, by above-mentioned institute
It obtains negative electrode tab, cobalt acid lithium lithium positive plate, diaphragm and uses winding process, lithium ion battery is made in collocation liquid electrolyte.
Embodiment 2
By 4% carboxymethyl cellulose lithium, 68% conductive agent, 28% binder, solvent stirs 6h in planet agitator tank, makes it sufficiently
Mixed preparing contains 30% admittedly, and electrocondution slurry is uniformly coated on collector by viscosity in the electrocondution slurry of 500 ~ 1000mPa.s, applies
Cloth thickness 1.5um, then toasts 4h in a vacuum drying oven, obtains conductive layer.
When preparing negative electrode slurry, 1.5% carboxymethyl cellulose lithium and 0.5% sodium carboxymethylcellulose is added, is stirred using planet
The mode mixed stirs 6h, and negative electrode slurry is made, is coated onto conductive layer surface, obtains the negative electrode layer with a thickness of 120um, then
12h is toasted in a vacuum drying oven, and negative electrode tab is finally made.Positive plate is prepared using conventional method, the anode on positive plate is living
Property substance be cobalt acid lithium, by above-mentioned gained negative electrode tab, cobalt acid lithium lithium positive plate, diaphragm use winding process, arrange in pairs or groups liquid electrolyte
Lithium ion battery is made in liquid.
Embodiment 3
By 4% carboxymethyl cellulose lithium, 68% conductive agent, 28% binder, solvent stirs 6h in planet agitator tank, makes it sufficiently
Mixed preparing contains 30% admittedly, and electrocondution slurry is uniformly coated on collector by viscosity in the electrocondution slurry of 500 ~ 1000mPa.s, applies
Cloth thickness 1.5um, then toasts 4h in a vacuum drying oven, obtains conductive layer.
When preparing negative electrode slurry, 1% carboxymethyl cellulose lithium and 1% sodium carboxymethylcellulose is added, using planet stirring
Mode stirs 6h, and negative electrode slurry is made, is coated onto conductive layer surface, the negative electrode layer with a thickness of 120um is obtained, then true
12h is toasted in empty drying box, and negative electrode tab is finally made.Positive plate is prepared using conventional method, the positive electrode active material on positive plate
Matter is cobalt acid lithium, above-mentioned gained negative electrode tab, cobalt acid lithium lithium positive plate, diaphragm is used winding process, liquid electrolyte system of arranging in pairs or groups
At lithium ion battery.
Embodiment 4
By 4% carboxymethyl cellulose lithium, 68% conductive agent, 28% binder, solvent stirs 6h in planet agitator tank, makes it sufficiently
Mixed preparing contains 30% admittedly, and electrocondution slurry is uniformly coated on collector by viscosity in the electrocondution slurry of 500 ~ 1000mPa.s, applies
Cloth thickness 1.5um, then toasts 4h in a vacuum drying oven, obtains conductive layer.
When preparing negative electrode slurry, 0.5% carboxymethyl cellulose lithium and 1.5% sodium carboxymethylcellulose is added, is stirred using planet
The mode mixed stirs 6h, and negative electrode slurry is made, is coated onto conductive layer surface, obtains the negative electrode layer with a thickness of 120um, then
12h is toasted in a vacuum drying oven, and negative electrode tab is finally made.Positive plate is prepared using conventional method, the anode on positive plate is living
Property substance be cobalt acid lithium, by above-mentioned gained negative electrode tab, cobalt acid lithium lithium positive plate, diaphragm use winding process, arrange in pairs or groups liquid electrolyte
Lithium ion battery is made in liquid.
Embodiment 5
By 4% carboxymethyl cellulose lithium, 68% conductive agent, 28% binder, solvent stirs 6h in planet agitator tank, makes it sufficiently
Mixed preparing contains 30% admittedly, and electrocondution slurry is uniformly coated on collector by viscosity in the electrocondution slurry of 500 ~ 1000mPa.s, applies
Cloth thickness 1.5um, then toasts 4h in a vacuum drying oven, obtains conductive layer.
When preparing negative electrode slurry, 2% carboxymethyl cellulose lithium and 1.5% sodium carboxymethylcellulose is added, using planet stirring
Mode stir 6h, be made negative electrode slurry, be coated onto conductive layer surface, obtain the negative electrode layer with a thickness of 120um, then exist
12h is toasted in vacuum oven, and negative electrode tab is finally made.Positive plate is prepared using conventional method, the positive-active on positive plate
Substance is cobalt acid lithium, above-mentioned gained negative electrode tab, cobalt acid lithium lithium positive plate, diaphragm is used winding process, liquid electrolyte of arranging in pairs or groups
Lithium ion battery is made.
Embodiment 6
By 4% carboxymethyl cellulose lithium, 68% conductive agent, 28% binder, solvent stirs 6h in planet agitator tank, makes it sufficiently
Mixed preparing contains 30% admittedly, and electrocondution slurry is uniformly coated on collector by viscosity in the electrocondution slurry of 500 ~ 1000mPa.s, applies
Cloth thickness 1.5um, then toasts 4h in a vacuum drying oven, obtains conductive layer.
When preparing negative electrode slurry, 2% sodium carboxymethylcellulose is added, 6h is stirred by the way of planet stirring, cathode is made
Slurry is coated onto conductive layer surface, obtains the negative electrode layer with a thickness of 120um, then toasts 12h in a vacuum drying oven,
Finally obtained negative electrode tab.Positive plate is prepared using conventional method, the positive active material on positive plate is cobalt acid lithium, by above-mentioned institute
It obtains negative electrode tab, cobalt acid lithium lithium positive plate, diaphragm and uses winding process, lithium ion battery is made in collocation liquid electrolyte.
Embodiment 7
By 4% sodium carboxymethylcellulose, 68% conductive agent, 28% binder, solvent stirs 6h in planet agitator tank, makes it sufficiently
Mixed preparing contains 30% admittedly, and electrocondution slurry is uniformly coated on collector by viscosity in the electrocondution slurry of 500 ~ 1000mPa.s, applies
Cloth thickness 1.5um, then toasts 4h in a vacuum drying oven, obtains conductive layer.
When preparing negative electrode slurry, 2% carboxymethyl cellulose lithium is added, 6h is stirred by the way of planet stirring, cathode is made
Slurry is coated onto conductive layer surface, obtains the negative electrode layer with a thickness of 120um, then toasts 12h in a vacuum drying oven,
Finally obtained negative electrode tab.Positive plate is prepared using conventional method, the positive active material on positive plate is cobalt acid lithium, by above-mentioned institute
It obtains negative electrode tab, cobalt acid lithium lithium positive plate, diaphragm and uses winding process, lithium ion battery is made in collocation liquid electrolyte.
Lithium battery made from comparative example 1 and embodiment 1 ~ 5 is tested, testing impedance is carried out, formation efficiency is surveyed for the first time
It tries, cell thickness expansion test after the cycle performance test and circulation under 25 DEG C of 1C/1C；Test result is as shown in table 1, follows
The resulting cyclic curve of ring is as shown in Figure 2.
Lithium battery made from comparative example 2 and embodiment 6,7 is tested, testing impedance is carried out, formation efficiency is surveyed for the first time
It tries, cell thickness expansion test after the cycle performance test and circulation under 25 DEG C of 1C/1C；Test result is as shown in table 2, follows
The resulting cyclic curve of ring is as shown in Figure 3.
Table 1
Table 2
From the test result of Tables 1 and 2 it is found that using the method for the present invention preparation negative electrode tab made from lithium ion battery, compare
Lithium ion battery internal resistance made from comparative example routine pole piece and formation efficiency has clear improvement for the first time, cycle performance of battery and electricity
Pond circulation thickness swelling also has clear improvement；Table 2 shows that carboxymethyl cellulose lithium is added to negative electrode layer ratio and is added to conductive layer effect
Fruit becomes apparent from；Fig. 2 and Fig. 3 is circulating battery curve graph, it can be seen that cathode of the present invention gained containing carboxymethyl cellulose lithium
Piece, cyclical stability is more preferable, and circulation volume conservation rate is higher within 700 weeks.
Claims (9)
1. a kind of negative electrode tab for reducing lithium ion battery impedance, which is characterized in that the negative electrode tab includes collector (1), leads
One side surface of electric layer (2) and negative electrode layer (3), the collector (1) is equipped with conductive layer (2), the table of the conductive layer (2)
Face is equipped with negative electrode layer (3).
2. a kind of negative electrode tab for reducing lithium ion battery impedance according to claim 1, it is characterised in that: the afflux
Body (1) is one of copper foil, porous copper foil, etching copper foil.
3. a kind of negative electrode tab for reducing lithium ion battery impedance according to claim 1 or 2, it is characterised in that: described
The thickness of collector (1) is less than 25 μm.
4. a kind of negative electrode tab for reducing lithium ion battery impedance according to claim 1, it is characterised in that: the conduction
Layer (2) with a thickness of 0.2 ~ 3 μm.
5. a kind of negative electrode tab for reducing lithium ion battery impedance according to claim 1 or 4, it is characterised in that: described
Conductive layer (2) the preparation method is as follows: by carboxymethyl cellulose lithium, conductive agent, binder and solvent be mixed, obtain conduction
Electrocondution slurry, is uniformly coated to (1) one side surface of collector by slurry, and vacuum bakeout obtains conductive layer (2).
6. a kind of negative electrode tab for reducing lithium ion battery impedance according to claim 1, it is characterised in that: the cathode
Layer (3) with a thickness of 10 ~ 200um.
7. a kind of negative electrode tab of reduction lithium ion battery impedance according to claim 1 or 6, it is characterised in that: described
Carboxymethyl cellulose lithium is added in negative electrode layer (3), content is 0.05wt.% ~ 5wt.%.
8. a kind of preparation method of negative electrode tab described in claim 1 ~ 7 any claim, it is characterised in that:
The method and step is as follows: carboxymethyl cellulose lithium, conductive agent, binder and solvent is mixed, admittedly contained
Amount is 10% ~ 50%, and viscosity is less than the electrocondution slurry of 2000mPa.s, and electrocondution slurry is uniformly coated to collector (1) side table
Face, vacuum bakeout obtain conductive layer (2)；Negative electrode slurry is stirred, is mixed them thoroughly, is then coated on conductive layer (2) surface,
Negative electrode layer is obtained, vacuum bakeout is carried out, obtains negative electrode tab.
9. lithium ion battery of the one kind containing negative electrode tab described in claim 1 ~ 7 any claim, it is characterised in that: described
Lithium ion battery include based lithium-ion battery positive plate, negative electrode tab.
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| CN201811582875.1A CN109659564A (en) | 2018-12-24 | 2018-12-24 | A kind of negative electrode tab and preparation method thereof reducing lithium ion battery impedance |
| PCT/CN2019/120268 WO2020134765A1 (en) | 2018-12-24 | 2019-11-22 | Negative electrode plate for reducing impedance of lithium ion battery and preparation method therefor |
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| CN112751034A (en) * | 2020-12-31 | 2021-05-04 | 远景动力技术(江苏)有限公司 | Negative electrode slurry for lithium ion battery, negative electrode, and lithium ion battery |
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| CN113138221A (en) * | 2021-04-20 | 2021-07-20 | 合肥国轩高科动力能源有限公司 | Method for optimizing proportion representation SEI film impedance of conductive agent and binder |
| CN113265008A (en) * | 2021-07-02 | 2021-08-17 | 重庆力宏精细化工有限公司 | High-viscosity lithium carboxymethyl cellulose and preparation method and application thereof |
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Application publication date: 20190419 |