CN111916754A - Manufacturing process of aluminum foil and positive current collector - Google Patents

Manufacturing process of aluminum foil and positive current collector Download PDF

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Publication number
CN111916754A
CN111916754A CN202010741884.1A CN202010741884A CN111916754A CN 111916754 A CN111916754 A CN 111916754A CN 202010741884 A CN202010741884 A CN 202010741884A CN 111916754 A CN111916754 A CN 111916754A
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aluminum foil
parts
silicon
positive electrode
acidic medium
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汪汉平
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Jingmen Yimei Industrial Design Co ltd
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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
    • H01M4/661—Metal or alloys, e.g. alloy 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
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/80—Porous plates, e.g. sintered carriers
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Abstract

The invention relates to the technical field of aluminum foils, in particular to a manufacturing process of an aluminum foil and a positive current collector, wherein the manufacturing process of the aluminum foil comprises the following steps: (1) cleaning the surface of the aluminum foil by using deionized water; (2) and (3) alternating-current electrifying the aluminum foil and soaking the aluminum foil in an acidic medium, and carrying out ultrasonic oscillation on the acidic medium in the soaking process, wherein the corrosion time is 10-14 min. The aluminum foil is not corroded by the traditional dichromate, the hydrochloric acid-sulfuric acid composite solution is adopted, the hydrochloric acid has strong corrosion capacity on the aluminum foil, more micropores can be generated on the surface of the aluminum foil, the generated micropores can be more regular and have relatively narrow pore size distribution by adopting sulfuric acid with a passivation effect on the aluminum and acetic acid and polyethylene glycol with a slow release function, and the aluminum foil has higher porosity and better mechanical strength by being assisted with the ultrasonic and alternating current effects.

Description

Manufacturing process of aluminum foil and positive current collector
Technical Field
The invention relates to the technical field of aluminum foils, in particular to a manufacturing process of an aluminum foil and a positive current collector.
Background
The new material and the clean energy are key development directions of the national level, the lithium ion battery is an energy storage battery cell which is most widely applied in the current energy storage technology, the improvement of the energy storage density of the battery cell is a target pursued all over the world, and the improvement of the energy density of the battery cell mainly depends on the development progress of the anode material and the cathode material of the battery cell, but is also related to the progress of materials such as the anode current collector, the anode binder, the cathode binder, the electrolyte, the diaphragm and the like of the lithium ion battery.
The current collector adopted by the anode of the lithium ion battery is generally composed of an aluminum foil and anode powder (lithium iron phosphate, lithium cobaltate or ternary material) coated on the aluminum foil. The traditional current collector material generally adopts an aluminum foil with a smooth surface, and adopts the aluminum foil with the purity of 99.7% to directly coat active substances, but the aluminum foil with the smooth surface and the active materials are combined loosely, so that the requirements on the quality of raw materials and auxiliary materials and the process are high, the phenomenon of falling off or powder falling of the active substances is easy to occur in the processing and charging and discharging processes, the cyclic charging and discharging efficiency is reduced, the service life of the battery is prolonged, the contact resistance between components is improved, the conductivity of the positive plate is reduced, and the comprehensive performance of the battery is influenced. The comprehensive performance of the lithium ion is seriously influenced. At present, people generally adopt a method of roughening the surface of an aluminum foil to increase the adhesive force between the aluminum foil and positive electrode powder, but the process cannot achieve the expected effect.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a manufacturing process of a microporous aluminum foil, wherein the aluminum foil has good cohesiveness with a positive electrode slurry layer and can improve the cyclicity of a lithium battery.
The purpose of the invention is realized by the following technical scheme:
a manufacturing process of an aluminum foil comprises the following steps:
(1) cleaning the surface of the aluminum foil by using deionized water;
(2) carrying out alternating current energization on the aluminum foil and soaking the aluminum foil in an acidic medium, and carrying out ultrasonic oscillation on the acidic medium in the soaking process, wherein the corrosion time is 10-14min;
wherein, the acid medium is an aqueous solution and comprises the following components in concentration:
HCl 0.4-0.6mol/L
H2SO4 0.1-0.2mol/L
acetic acid 0.01-0.03mol/L
0.01-0.02mol/L of polyethylene glycol.
The aluminum foil is not corroded by the traditional dichromate, the hydrochloric acid-sulfuric acid composite solution is adopted, the hydrochloric acid has strong corrosion capacity on the aluminum foil, more micropores can be generated on the surface of the aluminum foil, the generated micropores can be more regular and have relatively narrow pore size distribution by adopting sulfuric acid with a passivation effect on the aluminum and acetic acid and polyethylene glycol with a slow release function, and the aluminum foil has higher porosity and better mechanical strength by being assisted with the ultrasonic and alternating current effects. The pore diameter of the micropores of the aluminum foil prepared by the method is 630-780nm, and the porosity is 21-29%.
Preferably, the acidic medium comprises the following components in concentrations:
HCl 0.5mol/L
H2SO4 0.15mol/L
acetic acid 0.02mol/L
0.015mol/L of polyethylene glycol.
Wherein the current density of the aluminum foil in the step (2) is 0.3-0.5A/cm2The AC frequency is 20-30 Hz.
Wherein in the step (2), the temperature of the acidic medium is kept between 40 and 50 ℃.
Wherein in the step (2), the frequency of the ultrasonic oscillation is 20-30 kHz.
The invention can effectively control the surface appearance of the aluminum foil by controlling various conditions of electrochemical corrosion, so that the aluminum foil has better electrical property and mechanical property.
Wherein the aluminum foil comprises the following components:
Fe 1.1-1.5wt%
Mg 0.9-1.3wt%
Cu 0.01-0.05wt%
Sn 0.02-0.04wt%
Ti 0.01-0.03wt%
the balance of Al and inevitable impurities.
The invention optimizes the composition of the aluminum foil, improves the consumption of Mg, Sn and Ti, can increase the porosity of the aluminum foil, is beneficial to the adhesion of anode slurry on the aluminum foil, and improves the cycle performance of the lithium battery.
Preferably, the composition of the aluminum foil is as follows:
Fe 1.3wt%
Mg 1.1wt%
Cu 0.03wt%
Sn 0.03wt%
Ti 0.02wt%
the balance of Al and inevitable impurities.
The positive electrode current collector consists of the aluminum foil and a positive electrode slurry layer coated on the surface of the aluminum foil.
The positive electrode slurry layer is formed by coating and curing positive electrode active slurry, and the positive electrode active slurry comprises the following components in parts by weight:
40-60 parts of positive active material
10-16 parts of silicon carbon microspheres
1-2 parts of binder
40-60 parts of N-methylpyrrolidine;
the preparation method of the silicon-carbon microspheres comprises the following steps:
A. adding 2-6 parts by weight of nano silicon powder and 10-20 parts by weight of polyacrylonitrile into 100 parts by weight of dimethylformamide, and uniformly stirring to obtain a mixed solution;
B. carrying out electrostatic spraying on the mixed solution to obtain silicon-organic matter microspheres;
C. and (3) carbonizing the silicon-organic matter microspheres at high temperature to obtain the silicon-carbon microspheres.
Wherein the particle size of the nano silicon powder is 100-140nm, the particle size of the obtained silicon-carbon microsphere is 470-540nm, and the specific surface area is 230-350m2/g。
The silicon-carbon microspheres prepared by the method have the characteristics of low particle size and high specific surface area, the conductivity is excellent, and the silicon-carbon microspheres obtained by carbonizing the polyacrylonitrile coated nano silicon powder are easier to embed into the aluminum foil of the invention compared with the conventional silicon-carbon microspheres sold in the market, so that the compaction density and the bending resistance of the aluminum foil are improved, the cycle performance of the prepared lithium battery is greatly improved, and the structural stability is higher.
Wherein the positive electrode active material is LiNixCoyMn(1-x-y)O2，y≤1，x+y≤1。
Wherein the power supply voltage of the electrostatic spraying is 80-120kV, and the distance between the nozzle and the receiving plate is 15-25 cm. The invention can control the precipitation state of polyacrylonitrile by controlling the specific condition of electrostatic spraying, is beneficial to the uniform distribution of nano silicon powder and the polyacrylonitrile, and the carbonized silicon-carbon microspheres have the characteristics of low particle size and high specific surface area and are easy to embed into the aluminum foil prepared by the invention.
Wherein, the specific conditions of the high-temperature carbonization are as follows: heating to 300 ℃ at a heating rate of 2-4 ℃/min, keeping the temperature for 0.5-1.5h, heating to 1100 ℃ at a heating rate of 8-10 ℃/min, and keeping the temperature for 4-6 h. According to the invention, by controlling the specific conditions of high-temperature carbonization, the surface appearance of the silicon-carbon microspheres can be controlled, the phenomenon of shell cracking is not easy to occur, and the silicon-carbon microspheres have complete structures and better conductivity.
Wherein, the binder is polyvinyl alcohol and/or carboxymethyl cellulose. Preferably, the binder is carboxymethyl cellulose, so that the adhesion of the positive electrode slurry to the aluminum foil can be improved, and the bending resistance of the negative electrode current collector can be improved.
The invention has the beneficial effects that: the aluminum foil is not corroded by the traditional dichromate, the hydrochloric acid-sulfuric acid composite solution is adopted, the hydrochloric acid has strong corrosion capacity on the aluminum foil, more micropores can be generated on the surface of the aluminum foil, the generated micropores can be more regular and have relatively narrow pore size distribution by adopting sulfuric acid with a passivation effect on the aluminum and acetic acid and polyethylene glycol with a slow release function, and the aluminum foil has higher porosity and better mechanical strength by being assisted with the ultrasonic and alternating current effects. The pore diameter of the micropores of the aluminum foil prepared by the method is 630-780nm, and the porosity is 21-29%.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
A manufacturing process of an aluminum foil comprises the following steps:
(1) cleaning the surface of the aluminum foil by using deionized water;
(2) carrying out alternating current energization on the aluminum foil and soaking the aluminum foil in an acidic medium, and carrying out ultrasonic oscillation on the acidic medium in the soaking process, wherein the corrosion time is 12 min;
wherein, the acid medium is an aqueous solution and comprises the following components in concentration:
HCl 0.5mol/L
H2SO4 0.15mol/L
acetic acid 0.02mol/L
0.015mol/L of polyethylene glycol.
Wherein the current density of the aluminum foil in the step (2) is 0.4A/cm2The AC frequency was 25 Hz.
Wherein in the step (2), the temperature of the acidic medium is kept at 45 ℃.
Wherein, in the step (2), the frequency of the ultrasonic oscillation is 25 kHz.
Wherein the aluminum foil comprises the following components:
Fe 1.3wt%
Mg 1.1wt%
Cu 0.03wt%
Sn 0.03wt%
Ti 0.02wt%
the balance of Al and inevitable impurities.
The aluminum foil prepared in this example had a micropore diameter of 690nm and a porosity of 25%
Example 2
A manufacturing process of an aluminum foil comprises the following steps:
(1) cleaning the surface of the aluminum foil by using deionized water;
(2) carrying out alternating current energization on the aluminum foil and soaking the aluminum foil in an acidic medium, and carrying out ultrasonic oscillation on the acidic medium in the soaking process, wherein the corrosion time is 10 min;
wherein, the acid medium is an aqueous solution and comprises the following components in concentration:
HCl 0.4mol/L
H2SO4 0.1mol/L
acetic acid 0.01mol/L
0.01mol/L of polyethylene glycol.
Wherein the current density of the aluminum foil in the step (2) is 0.3A/cm2The AC frequency was 20 Hz.
Wherein in the step (2), the temperature of the acidic medium is kept at 40 ℃.
Wherein, in the step (2), the frequency of the ultrasonic oscillation is 20 kHz.
Wherein the aluminum foil comprises the following components:
Fe 1.1wt%
Mg 0.9wt%
Cu 0.01wt%
Sn 0.02wt%
Ti 0.01wt%
the balance of Al and inevitable impurities.
The aluminum foil prepared in this example had a pore diameter of 630nm and a porosity of 29%.
Example 3
A manufacturing process of an aluminum foil comprises the following steps:
(1) cleaning the surface of the aluminum foil by using deionized water;
(2) carrying out alternating current energization on the aluminum foil and soaking the aluminum foil in an acidic medium, and carrying out ultrasonic oscillation on the acidic medium in the soaking process, wherein the corrosion time is 14min;
wherein, the acid medium is an aqueous solution and comprises the following components in concentration:
HCl 0.6mol/L
H2SO4 0.2mol/L
acetic acid 0.03mol/L
0.02mol/L of polyethylene glycol.
0.015mol/L of polyethylene glycol.
Wherein the current density of the aluminum foil in the step (2) is 0.5A/cm2The AC frequency was 30 Hz.
Wherein in the step (2), the temperature of the acidic medium is kept at 50 ℃.
Wherein, in the step (2), the frequency of the ultrasonic oscillation is 30 kHz.
Wherein the aluminum foil comprises the following components:
Fe 1.5wt%
Mg 1.3wt%
Cu 0.05wt%
Sn 0.04wt%
Ti 0.03wt%
the balance of Al and inevitable impurities.
The aluminum foil prepared in this example had a pore diameter of 780nm and a porosity of 21%
Example 4
A positive electrode current collector, which consists of the aluminum foil of example 1 and a positive electrode slurry layer coated on the surface of the aluminum foil.
The positive electrode slurry layer is formed by coating and curing positive electrode active slurry, and the positive electrode active slurry comprises the following components in parts by weight:
50 parts of positive electrode active material
Silicon carbon microsphere 13 parts
1.5 parts of binder
50 parts of N-methylpyrrolidine;
the preparation method of the silicon-carbon microspheres comprises the following steps:
A. adding 4 parts by weight of nano silicon powder and 15 parts by weight of polyacrylonitrile into 100 parts by weight of dimethylformamide, and uniformly stirring to obtain a mixed solution;
B. carrying out electrostatic spraying on the mixed solution to obtain silicon-organic matter microspheres;
C. and (3) carbonizing the silicon-organic matter microspheres at high temperature to obtain the silicon-carbon microspheres.
Wherein the particle size of the nano silicon powder is 120nm, the particle size of the obtained silicon-carbon microsphere is 501.2nm, and the specific surface area is 241.2m2/g。
Wherein the positive electrode active material is LiNixCoyMn(1-x-y)O2，y≤1，x+y≤1。
Wherein the power supply voltage of the electrostatic spraying is 100kV, and the distance between the nozzle and the receiving plate is 20 cm.
Wherein, the specific conditions of the high-temperature carbonization are as follows: heating to 275 deg.C at a rate of 2-4 deg.C/min, maintaining for 1h, heating to 1000 deg.C at a rate of 9 deg.C/min, and maintaining for 5 h.
Wherein the binder is carboxymethyl cellulose.
Example 5
A positive electrode current collector, which consists of the aluminum foil of example 1 and a positive electrode slurry layer coated on the surface of the aluminum foil.
The positive electrode slurry layer is formed by coating and curing positive electrode active slurry, and the positive electrode active slurry comprises the following components in parts by weight:
40 parts of positive electrode active material
10 portions of silicon carbon microspheres
1 part of binder
40 parts of N-methylpyrrolidine;
the preparation method of the silicon-carbon microspheres comprises the following steps:
A. adding 2 parts by weight of nano silicon powder and 10 parts by weight of polyacrylonitrile into 100 parts by weight of dimethylformamide, and uniformly stirring to obtain a mixed solution;
B. carrying out electrostatic spraying on the mixed solution to obtain silicon-organic matter microspheres;
C. and (3) carbonizing the silicon-organic matter microspheres at high temperature to obtain the silicon-carbon microspheres.
Wherein the particle size of the nano silicon powder is 100nm, the particle size of the obtained silicon-carbon microsphere is 470nm, and the specific surface area is 350m2/g。
Wherein the positive electrode active material is LiNixCoyMn(1-x-y)O2，y≤1，x+y≤1。
Wherein the power voltage of the electrostatic spraying is 80kV, and the distance between the nozzle and the receiving plate is 15 cm.
Wherein, the specific conditions of the high-temperature carbonization are as follows: heating to 250 deg.C at a heating rate of 2 deg.C/min, maintaining for 0.5h, heating to 900 deg.C at a heating rate of 8 deg.C/min, and maintaining for 4 h.
Wherein the binder is carboxymethyl cellulose.
Example 6
A positive electrode current collector, which consists of the aluminum foil of example 1 and a positive electrode slurry layer coated on the surface of the aluminum foil.
The positive electrode slurry layer is formed by coating and curing positive electrode active slurry, and the positive electrode active slurry comprises the following components in parts by weight:
60 parts of positive electrode active material
Silicon carbon microsphere 16 parts
2 portions of binder
60 parts of N-methylpyrrolidine;
the preparation method of the silicon-carbon microspheres comprises the following steps:
A. adding 6 parts by weight of nano silicon powder and 20 parts by weight of polyacrylonitrile into 100 parts by weight of dimethylformamide, and uniformly stirring to obtain a mixed solution;
B. carrying out electrostatic spraying on the mixed solution to obtain silicon-organic matter microspheres;
C. and (3) carbonizing the silicon-organic matter microspheres at high temperature to obtain the silicon-carbon microspheres.
Wherein the particle size of the nano silicon powder is 140nm, the particle size of the obtained silicon-carbon microsphere is 540nm, and the specific surface area is 230m2/g。
Wherein the positive electrode active material is LiNixCoyMn(1-x-y)O2，y≤1，x+y≤1。
Wherein the power supply voltage of the electrostatic spraying is 120kV, and the distance between the nozzle and the receiving plate is 25 cm.
Wherein, the specific conditions of the high-temperature carbonization are as follows: heating to 300 ℃ at the heating rate of 4 ℃/min, preserving heat for 1.5h, heating to 1100 ℃ at the heating rate of 10 ℃/min, and preserving heat for 6 h.
Wherein the binder is polyvinyl alcohol.
Comparative example 1
This comparative example differs from example 4 in that: the silicon-carbon microspheres are conventional silicon-carbon microspheres sold in the market.
The positive electrode current collectors of examples 4 to 6 and comparative example 1 were prepared into batteries, lithium titanate was used as an active material for the negative electrode current collector, lithium hexafluorophosphate was used as a lithium salt for the electrolyte, and propylene carbonate was used as an organic solvent, and the batteries were subjected to charge-discharge cycles at a voltage range of 3.0V to 4.5V, and charged and discharged at a rate of 1C, and the thickness expansion rate and the capacity retention rate of the batteries after 400 cycles were recorded.
The data recorded are as follows:
thickness expansion ratio (%) Capacity retention (%) after 400 cycles
Example 4 81.4 86.1
Example 5 83.5 83.5
Example 6 95.5 81.3
Comparative example 1 177.6 76.6
The comparison of the test data shows that the specially-made silicon-carbon microspheres have good adhesiveness on the specially-made microporous aluminum foil, are not easy to expand and fall off after repeated circulation, effectively improve the circulation capacity retention performance of the lithium battery and improve the durability of the lithium battery.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.

Claims (3)

1. The anode is characterized by consisting of an aluminum foil and an anode slurry layer coated on the surface of the aluminum foil;
the aluminum foil comprises the following components:
Fe1.1-1.5wt%
Mg0.9-1.3wt%
Cu0.01-0.05wt%
Sn0.02-0.04wt%
Ti0.01-0.03wt%
the balance of Al and inevitable impurities;
the manufacturing process of the aluminum foil comprises the following steps:
(1) cleaning the surface of the aluminum foil by using deionized water;
(2) carrying out alternating current energization on the aluminum foil and soaking the aluminum foil in an acidic medium, and carrying out ultrasonic oscillation on the acidic medium in the soaking process, wherein the corrosion time is 10-14min;
wherein, the acid medium is an aqueous solution and comprises the following components in concentration:
HCl0.4-0.6mol/L
H2SO40.1-0.2mol/L
acetic acid 0.01-0.03mol/L
0.01-0.02mol/L of polyethylene glycol;
the positive electrode slurry layer is formed by coating and curing positive electrode active slurry, and the positive electrode active slurry comprises the following components in parts by weight:
40-60 parts of positive active material
10-16 parts of silicon carbon microspheres
1-2 parts of binder
40-60 parts of N-methylpyrrolidine;
the preparation method of the silicon-carbon microspheres comprises the following steps:
A. adding 2-6 parts by weight of nano silicon powder and 10-20 parts by weight of polyacrylonitrile into 100 parts by weight of dimethylformamide, and uniformly stirring to obtain a mixed solution;
B. carrying out electrostatic spraying on the mixed solution to obtain silicon-organic matter microspheres;
C. carrying out high-temperature carbonization on the silicon-organic matter microspheres to obtain silicon-carbon microspheres;
wherein the particle size of the nano silicon powder is 100-140nm, the particle size of the obtained silicon-carbon microsphere is 470-540nm, and the specific surface area is 230-350m2/g；
The acidic medium comprises the following components in concentration:
HCl0.5mol/L
H2SO40.15mol/L
acetic acid 0.02mol/L
0.015mol/L of polyethylene glycol;
the current density of the alternating current in the step (2) is 0.3-0.5A/cm2The alternating current frequency is 20-30 Hz; in the step (2), the temperature of the acidic medium is kept between 40 and 50 ℃.
2. A positive electrode according to claim 1, characterized in that: in the step (2), the frequency of the ultrasonic oscillation is 20-30 kHz.
3. A positive electrode according to claim 1, characterized in that: the aluminum foil comprises the following components:
Fe1.3wt%
Mg1.1wt%
Cu0.03wt%
Sn0.03wt%
Ti0.02wt%
the balance of Al and inevitable impurities.
CN202010741884.1A 2019-03-24 2019-03-24 Manufacturing process of aluminum foil and positive current collector Withdrawn CN111916754A (en)

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CN112635771A (en) * 2020-12-18 2021-04-09 合肥国轩高科动力能源有限公司 Surface treatment method and application of aluminum current collector for lithium ion battery
CN112635771B (en) * 2020-12-18 2021-12-14 合肥国轩高科动力能源有限公司 Surface treatment method and application of aluminum current collector for lithium ion battery
CN114023973A (en) * 2021-11-04 2022-02-08 山东大学 Porous aluminum current collector and preparation method and application thereof
CN114023973B (en) * 2021-11-04 2023-08-11 山东大学 Porous aluminum current collector and preparation method and application thereof
CN114094053A (en) * 2021-11-05 2022-02-25 惠州锂威新能源科技有限公司 Tail aluminum foil processing method for improving safety test of lithium ion battery

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