CN109599563A - Affluxion body in lithium ion batteries and preparation method thereof - Google Patents
Affluxion body in lithium ion batteries and preparation method thereof Download PDFInfo
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- CN109599563A CN109599563A CN201811401509.1A CN201811401509A CN109599563A CN 109599563 A CN109599563 A CN 109599563A CN 201811401509 A CN201811401509 A CN 201811401509A CN 109599563 A CN109599563 A CN 109599563A
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- lithium ion
- ion batteries
- affluxion body
- parent metal
- conductive
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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
Abstract
Present invention discloses a kind of affluxion body in lithium ion batteries, and including flexible parent metal and the conductive coating for being coated on the flexible parent metal surface, the conductive coating includes chemical deposit and electroplated layer from the inside to the outside.Present invention further teaches a kind of preparation methods of affluxion body in lithium ion batteries, comprising the following steps: is surface-treated the chemical deposit into the conductive coating for forming affluxion body in lithium ion batteries in flexible parent metal by chemical plating process；The electroplated layer into the conductive coating for forming affluxion body in lithium ion batteries is surface-treated in chemical deposit by electroplating technology.A kind of affluxion body in lithium ion batteries of the invention and preparation method thereof has the characteristics that battery afflux liquid strength character is good, can improve the security performance of lithium ion battery.
Description
Technical field
The present invention relates to technical field of lithium ion, a kind of affluxion body in lithium ion batteries and its system are especially related to
Preparation Method.
Background technique
It is well known that lithium ion battery has capacity big, and it is light-weight, the characteristics of having extended cycle life；Not only it is widely used as hand
The power supply of the portable electronic devices such as machine, laptop, digital camera and video camera, also electric tool Moped Scooter with
And the fields such as electric car show good prospect.
The positive and negative anodes collector of lithium ion battery is both the carrier of positive and negative anodes active material and the carrier of energy conversion,
It is the important component of lithium ion battery.It is general using active material in the pole piece manufacture craft of current lithium ion battery
Slurry material is directly coated at the surface of copper foil or aluminium foil；Or by after copper foil or aluminium foil drying, passes through binder and realize active material
Material is fixed on copper foil or aluminium foil is the collection liquid surface of substrate.The thickness one of existing positive and negative anodes current collector material copper foil or aluminium foil
As in 5~20 microns of range, but due to the characteristic that it enbrittles and toughness is low, lithium ion battery plus-negative plate material is caused to exist
The coating of production process, drying are easy to happen fracture in slice process process, edge damage, generate the bad phenomenons such as burr, cause material
Material waste, homogeneity of product difference and safety problem.
Summary of the invention
The main object of the present invention is to provide a kind of affluxion body in lithium ion batteries and preparation method thereof, has strength character
Well, the characteristics of security performance of lithium ion battery can be improved.
In order to achieve the above technical purposes, the invention proposes following technical solutions:
On the one hand, the present invention proposes a kind of affluxion body in lithium ion batteries, including flexible parent metal and is coated on the flexible base
The conductive coating on material surface, the conductive coating include chemical deposit and electroplated layer from the inside to the outside.
Further, the flexible parent metal is non-conductive flexible parent metal.
Further, the non-conductive flexible parent metal includes polyethylene, polypropylene, polycarbonate, glass-fiber-fabric, polyamides Asia
At least one of amine and polyester film.
Further, the flexible parent metal is conductive flexible substrate.
Further, the conductive flexible substrate includes that graphene film, oxide membrane system conductive film, macromolecule membrane system are led
At least one of electrolemma and compound film system conductive film.
Further, the porosity of the flexible parent metal is less than 10%, and thickness is less than 20 microns.
Further, the chemical deposit and electroplated layer are one of copper plate, silver coating, Gold plated Layer or a variety of
Stacking.
Further, the thickness of the conductive coating is less than 10 microns.
On the other hand, a kind of preparation method of affluxion body in lithium ion batteries, comprising the following steps:
Through chemical plating process in the conductive coating that flexible parent metal is surface-treated to formation affluxion body in lithium ion batteries
Chemical deposit；
The electricity into the conductive coating for forming affluxion body in lithium ion batteries is surface-treated in chemical deposit by electroplating technology
Coating.
The conductive coating on affluxion body in lithium ion batteries of the invention, flexible parent metal and flexible parent metal surface forms flexible
Affluxion body in lithium ion batteries not only has the function of common copper foil, aluminum foil current collector, and high, good toughness the spy with intensity
Point, in cutting and needle thorn, impulse- free robustness is generated, available effect highly-safe, waste of material is few；In addition, flexible parent metal can
Corresponding substrate is selected according to demand, there is unrestricted choice, there are potentiality in drop low cost aspect, and can be by selecting non-light
The flexible parent metal of sliding surface topography, realizes the peel strength of pole piece after increasing roll-in；Conductive coating include chemical deposit and its outside
The electroplated layer in portion can further promote the electric conductivity of the affluxion body in lithium ion batteries.
Detailed description of the invention
Fig. 1 is the preparation method block diagram of affluxion body in lithium ion batteries of the invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Embodiment
Affluxion body in lithium ion batteries of the invention is plated including flexible parent metal and the conduction for being coated on the flexible parent metal surface
Layer, the conductive coating includes chemical deposit and electroplated layer from the inside to the outside.
Flexible parent metal be can tensile deformation, high temperature resistant, electrolyte resistance corrosion flexible material.Enable flexible parent metal into
Row chemical plating and plating obtain chemical deposit and electroplated layer.
In the present embodiment, flexible parent metal is non-conductive flexible parent metal.
Above-mentioned non-conductive flexible parent metal includes polyethylene (PE), polypropylene (PP), polycarbonate (PC), glass-fiber-fabric, polyamides
At least one of imines and polyester film.More specifically, non-conductive flexible parent metal can for polyethylene, polypropylene, polycarbonate,
One of glass-fiber-fabric, polyimides and polyester film or a variety of combinations.Non-conductive flexible parent metal can also be that other are not led
Material electric and flexible.
In addition, flexible parent metal can also be conductive flexible substrate.
Above-mentioned conductive flexible substrate includes graphene film, oxide membrane system conductive film, macromolecule membrane system conductive film and compound
At least one of membrane system conductive film.More specifically, conductive flexible substrate graphene film, oxide membrane system conductive film, polymeric membrane
It is one of conductive film and compound film system conductive film or a variety of combinations.Conductive flexible substrate can also be that other are conductive and soft
The material of property.
The porosity of flexible parent metal is less than 10%, and thickness is less than 20 microns.Flexible parent metal can be passed through in specific use
Selection obtains smooth or three-dimensional porous lithium battery collector.
Chemical deposit and electroplated layer are one of copper plate, silver coating, Gold plated Layer, nickel coating or a variety of stackings.It can
It selects different coating or different electroplated coating combinations as chemical deposit and electroplated layer according to the parameter request of battery, there is design spirit
Living, adaptable feature.In addition, chemical deposit and electroplated layer can also be copper plate, silver coating, Gold plated Layer, outside nickel coating
Other coating.
The thickness of conductive coating is less than 10 microns.
Referring to Fig.1, the preparation method of affluxion body in lithium ion batteries of the invention, comprising the following steps:
S1, by chemical plating process flexible parent metal be surface-treated to formed affluxion body in lithium ion batteries conductive coating in
Chemical deposit；
S2, by electroplating technology chemical deposit be surface-treated to formed affluxion body in lithium ion batteries conductive coating in
Electroplated layer.
It is worth noting that: step S1 and step S2 can be carried out repeatedly, achieve the purpose that plate layer stackup, to obtain uniformly
And the better coating of toughness；Plating in step S1 in chemical plating and step S2 can not reversed order；Chemical deposit needs uniform cloth
Full flexible parent metal surface, to reach the requirement for forming electroplated layer in next step.
Wherein, step S1 concrete operations are following (by taking chemical-copper-plating process as an example):
S11, flexible parent metal surface cleaning: cleaning liquid system appropriate is selected to carry out substrate surface according to substrate property clear
Clean processing.Cleaning treatment, which is included in clean solution, cleans 1~5 minute, cleans 2 minutes in deionized water.Preferably, such as will
Substrate immerses containing sodium carbonate (40~60g/L), tertiary sodium phosphate (40~60g/L), neopelex (0.1-2g/L)
It cleans in aqueous solution 1~5 minute, cleans 2 minutes in deionized water later；Such as flexible parent metal clean surface, this step can skip
Suddenly；
S12, pre-preg.Preferably, the substrate after surface cleaning is immersed into sodium chloride-containing (100g/L) and hydrochloric acid
1~2 minute in the aqueous solution of (10mL/L)；
S13, activation processing.Preferably, the substrate after pre-preg is being contained into SnCl2·2H2O (100g/L), hydrochloric acid
It is impregnated 1~3 minute in the aqueous solution of (100mL/L), NaCl (200g/L)；
S14, dispergation processing.Preferably, the substrate after activation is impregnated in the solution containing sodium acetate (20~25g/L)
1 minute；
S15, chemical plating.The chemical plating time is 8~20 minutes.Preferably, by the substrate by dispergation processing
Containing copper sulphate (14g/L), sodium potassium tartrate tetrahydrate (40g/L), sodium hydroxide (20g/L), thiocarbamide (0.5g/L), glyoxalic acid (10
~15mL/L) aqueous solution in handle 8~20 minutes；
S16, post-processing.Preferably, it will immerse in deionized water and clean 2 minutes by the processed substrate of electroless copper,
Hot blast drying later is moved into dry environment and is saved.
Wherein, step S2 concrete operations are following (by taking copper plating process as an example):
S21, pickling.Pickling time is 15~45 seconds.It preferably, will treated that substrate is containing sulfuric acid by chemical plating
It is impregnated 30 seconds in the aqueous solution of (10mL/L)；
S22, plating.Plating is electroplated 10~30 seconds with the current density of 1~15ASD.Preferably, the substrate after pickling is soaked
Enter containing copper sulphate (75g/L), sulfuric acid (180g/L), chloride ion (0.008g/L), 3- sulfydryl -1- propyl sulfonic acid sodium (0.01g/
L), in the aqueous solution of sodium polydithio-dipropyl sulfonate (0.01g/L), polyethylene glycol (0.02g/L), with the current density of 10ASD
Plating 20 seconds；
S23, post-processing.Substrate obtained in step S22 is immersed in deionized water and cleans 2 minutes, later hot blast drying,
It moves into dry environment and saves.
A kind of lithium ion battery of glass-fiber-fabric substrate is produced with the preparation method of affluxion body in lithium ion batteries of the invention
Negative current collector, steps are as follows:
A. it chooses glass-fiber-fabric and as flexible parent metal and carries out surface cleaning.Choose 5 microns of thickness, the glass-fiber-fabric of 250 mm wides,
It is dipped in containing sodium carbonate (40~60g/L), tertiary sodium phosphate (40~60g/L), neopelex (0.1-2g/L)
It cleans 1~5 minute, then cleans in deionized water 2 minutes in aqueous solution, take out drip 10 seconds later；
B. pre-preg.Sodium chloride-containing (100g/L) and hydrochloric acid (10mL/L) will be immersed by a step treated glass-fiber-fabric
Aqueous solution in 1~2 minute, later take out drip 10 seconds；
C. it is activated.SnCl will contained by b step treated glass-fiber-fabric2·2H2O (100g/L), hydrochloric acid (100mL/
L), impregnated in the aqueous solution of NaCl (200g/L) 1~3 minute, take out drip 10 seconds later；
D. dispergation is handled.It will be impregnated in the solution containing sodium acetate (20~25g/L) by c step treated glass-fiber-fabric
It 1 minute, takes out drip 10 seconds later；
E. chemical plating.Copper sulphate (14g/L), sodium potassium tartrate tetrahydrate will contained by d step treated glass-fiber-fabric
(40g/L), sodium hydroxide (20g/L), thiocarbamide (0.5g/L), glyoxalic acid (10~15mL/L) aqueous solution in handle 8~20 points
Clock；
F. chemical plating posttreatment.It will immerse in deionized water and clean 2 minutes by e step treated glass-fiber-fabric, Zhi Houre
Wind is dry；
G. pickling.It will be impregnated 30 seconds in the aqueous solution containing sulfuric acid (10mL/L) by f step treated glass-fiber-fabric；
H. it is electroplated and is electroplated post-processing.It will be immersed by g step treated glass-fiber-fabric and contain copper sulphate (75g/L), sulfuric acid
(180g/L), chloride ion (0.008g/L), 3- sulfydryl -1- propyl sulfonic acid sodium (0.01g/L), sodium polydithio-dipropyl sulfonate
In the aqueous solution of (0.01g/L), polyethylene glycol (0.02g/L), be electroplated 20 seconds with the current density of 10ASD, immerse later go from
Clean 2 minutes in sub- water, later hot blast drying；
I. it will be coated with using graphite cathode material slurries by h step treated glass-fiber-fabric, and carry out roller after 120 DEG C of drying
Pressure obtains pole piece, and is cut out by specification, the burr situation after testing the resistance of pole piece, cohesive force, needle thorn.
Burr situation table after the different cathode pole piece resistivity of table 1, cohesive force and needle thorn
In table 1, pole piece number 1 to 3 is that the negative electrode of lithium ion battery collector of glass-fiber-fabric substrate cuts out three obtained pole piece,
Copper foil is existing traditional pole piece.By table 1 it can be concluded that the negative electrode of lithium ion battery collector prepared by present invention process
It can enhance cathode pole piece peel strength, impulse- free robustness and be able to maintain and conductivity similar in common copper foil after needle thorn.
The lithium ion battery for producing a kind of PE film base material with the preparation method of affluxion body in lithium ion batteries of the invention is negative
Pole collector, steps are as follows:
A. it chooses PE film and as flexible parent metal and carries out surface cleaning.Choose 3 microns of thickness, the PE film of 250 mm wides, by it
Immerse containing sodium carbonate (40~60g/L), tertiary sodium phosphate (40~60g/L), neopelex (0.1-2g/L) it is water-soluble
It cleans 1~5 minute, then cleans in deionized water 2 minutes in liquid, take out drip 10 seconds later；
B. pre-preg.Sodium chloride-containing (100g/L) and hydrochloric acid (10mL/L) will be immersed by a step treated PE film
1~2 minute in aqueous solution, takes out drip 10 seconds later；
C. it is activated.SnCl will contained by b step treated PE film2·2H2O (100g/L), hydrochloric acid (100mL/L),
It is impregnated in the aqueous solution of NaCl (200g/L) 1~3 minute, takes out drip 10 seconds later；
D. dispergation is handled.1 will be impregnated in the solution containing sodium acetate (20~25g/L) by c step treated PE film
Minute, it takes out drip 10 seconds later；
E. chemical plating.Copper sulphate (14g/L), sodium potassium tartrate tetrahydrate (40g/ will contained by d step treated PE film
L), handled 8~20 minutes in the aqueous solution of sodium hydroxide (20g/L), thiocarbamide (0.5g/L), glyoxalic acid (10~15mL/L)；
F. chemical plating posttreatment.It will be immersed in deionized water by e step treated PE film and clean 2 minutes, later hot wind
Drying；
G. pickling.It will be impregnated 30 seconds in the aqueous solution containing sulfuric acid (10mL/L) by f step treated PE film；
H. it is electroplated and is electroplated post-processing.It will be immersed by g step treated PE film and contain copper sulphate (75g/L), sulfuric acid
(180g/L), chloride ion (0.008g/L), 3- sulfydryl -1- propyl sulfonic acid sodium (0.01g/L), sodium polydithio-dipropyl sulfonate
In the aqueous solution of (0.01g/L), polyethylene glycol (0.02g/L), be electroplated 20 seconds with the current density of 10ASD, immerse later go from
Clean 2 minutes in sub- water, later hot blast drying；
I. it will be coated with using graphite cathode material slurries by h step treated PE film, and carry out roll-in after 120 DEG C of drying
Pole piece is obtained, and is cut out by specification, the burr situation after testing the resistance of pole piece, cohesive force, needle thorn.
Burr situation table after the different cathode pole piece resistivity of table 2, cohesive force and needle thorn
| Pole piece number | Resistivity/k Ω cm | Cohesive force/kNm-1 | Burr after needle thorn |
| 1 | 0.51 | 0.07 | Nothing |
| 2 | 0.48 | 0.06 | Nothing |
| 3 | 0.50 | 0.09 | Nothing |
| Copper foil | 0.46 | 0.09 | Have |
In table 2, pole piece number 1 to 3 is that the negative electrode of lithium ion battery collector of PE film base material cuts out three obtained pole piece, copper
Foil is existing traditional pole piece.By table 2 it can be concluded that the negative electrode of lithium ion battery afflux body acupuncture prepared by present invention process
It impulse- free robustness and is able to maintain and cathode pole piece peel strength and conductivity similar in common copper foil after thorn.
A kind of lithium ion battery of PE film base material is produced with affluxion body in lithium ion batteries and preparation method thereof of the invention
Plus plate current-collecting body, steps are as follows:
A. PE film is chosen as flexible parent metal；It is surface-treated in flexible parent metal to formation lithium-ion electric by chemical plating process
Chemical deposit in the conductive coating of pond collector.3 microns of thickness are chosen, it is passed through chemical plating metal working by the PE film of 250 mm wides
Skill (process is shown in Table 3) obtains uniform Gold plated Layer on surface；
3 chemical gilding process flow table of table
B. through electroplating technology in the conductive coating that chemical deposit is surface-treated to formation affluxion body in lithium ion batteries
Electroplated layer.It will be close with the electric current of 1ASD using CT-086 acidity 24K gold plating bath (30mL/L) by a step treated PE film
Degree plating 20 seconds, immerses in deionized water clean 2 minutes later, later hot blast drying；
C. it will be coated with using lithium cobaltate cathode material slurries by b step treated PE film, and carry out roller after 120 DEG C of drying
Pressure obtains pole piece, and is cut out by specification, the burr situation after testing the resistance of pole piece, cohesive force, needle thorn；
Burr situation table after the different anode pole piece resistivity of table 4, cohesive force and needle thorn
| Pole piece number | Resistivity/k Ω cm | Cohesive force/kNm-1 | Burr after needle thorn |
| 1 | 0.47 | 0.12 | Nothing |
| 2 | 0.45 | 0.11 | Nothing |
| 3 | 0.45 | 0.14 | Nothing |
| Aluminium foil | 0.57 | 0.14 | Have |
In table 4, pole piece number 1 to 3 is that the anode current collector of lithium ion battery of PE film base material cuts out three obtained pole piece, copper
Foil is existing traditional pole piece.By table 4 it can be concluded that the anode current collector of lithium ion battery energy prepared by present invention process
Reduce the resistivity of anode pole piece, impulse- free robustness and is able to maintain and anode pole piece peel strength similar in conventional aluminium foil after needle thorn.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (9)
1. a kind of affluxion body in lithium ion batteries, which is characterized in that including flexible parent metal and be coated on the flexible parent metal surface
Conductive coating, the conductive coating include chemical deposit and electroplated layer from the inside to the outside.
2. affluxion body in lithium ion batteries according to claim 1, which is characterized in that the flexible parent metal is non-conductive soft
Property substrate.
3. affluxion body in lithium ion batteries according to claim 2, which is characterized in that the non-conductive flexible parent metal includes
At least one of polyethylene, polypropylene, polycarbonate, glass-fiber-fabric, polyimides and polyester film.
4. affluxion body in lithium ion batteries according to claim 1, which is characterized in that the flexible parent metal is conductive flexible
Substrate.
5. affluxion body in lithium ion batteries according to claim 4, which is characterized in that the conductive flexible substrate includes stone
At least one of black alkene film, oxide membrane system conductive film, macromolecule membrane system conductive film and compound film system conductive film.
6. affluxion body in lithium ion batteries according to claim 1, which is characterized in that the porosity of the flexible parent metal is less than
10%, thickness is less than 20 microns.
7. affluxion body in lithium ion batteries according to claim 1, which is characterized in that the chemical deposit and electroplated layer is equal
For one of copper plate, silver coating, Gold plated Layer or a variety of stackings.
8. affluxion body in lithium ion batteries according to claim 1, which is characterized in that the thickness of the conductive coating is less than 10
Micron.
9. a kind of preparation method of affluxion body in lithium ion batteries described in claim 1 to 8 any one, which is characterized in that packet
Include following steps:
The chemistry into the conductive coating for forming affluxion body in lithium ion batteries is surface-treated in flexible parent metal by chemical plating process
Coating；
The electroplated layer into the conductive coating for forming affluxion body in lithium ion batteries is surface-treated in chemical deposit by electroplating technology.
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| CN110364738A (en) * | 2019-06-14 | 2019-10-22 | 广东工业大学 | One type graphene anode composite collector and its preparation method and application |
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| CN115440989A (en) * | 2022-09-30 | 2022-12-06 | 楚能新能源股份有限公司 | Negative current collector for lithium ion battery, pole piece and preparation method of negative current collector |
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| CN110739461A (en) * | 2019-09-05 | 2020-01-31 | 东莞市烯热材料科技有限公司 | novel graphene-like heat-conducting composite current collector for positive and negative poles of lithium ion |
| CN111211330A (en) * | 2020-02-20 | 2020-05-29 | 青岛科技大学 | Bendable lithium ion battery and preparation method thereof |
| CN111682218A (en) * | 2020-05-14 | 2020-09-18 | 超威电源集团有限公司 | Enhanced carbon-containing material current collector and preparation method thereof |
| CN113517445A (en) * | 2021-05-20 | 2021-10-19 | 上海工程技术大学 | Flexible battery current collector, electrode plate and electrode lug for lithium ion battery |
| WO2023142320A1 (en) * | 2022-01-27 | 2023-08-03 | 江阴纳力新材料科技有限公司 | Preparation method for composite current collector |
| CN114759192A (en) * | 2022-04-28 | 2022-07-15 | 江苏亨通精密铜业有限公司 | Layered composite conductive material, preparation process and current collector |
| CN114759192B (en) * | 2022-04-28 | 2023-12-15 | 江苏瀚叶铜铝箔新材料研究院有限公司 | Layered composite conductive material, preparation process and current collector |
| CN115440989A (en) * | 2022-09-30 | 2022-12-06 | 楚能新能源股份有限公司 | Negative current collector for lithium ion battery, pole piece and preparation method of negative current collector |
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Application publication date: 20190409 |