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Current collector suitable for lithium ion battery electrode material and preparation thereof, and application of current collector suitable for lithium ion battery electrode material

A lithium-ion battery, electrode material technology, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of lithium-ion battery performance degradation, aluminum foil current collector corrosion, etc., to achieve superior performance, easy operation, simple craftsmanship

Active Publication Date: 2019-06-28
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, aluminum foil is a common current collector for lithium-ion battery cathode materials. However, in fact, aluminum foil current collectors are often severely corroded due to the destruction of the surface passivation film, and the performance of lithium-ion batteries is also reduced.

Method used

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  • Current collector suitable for lithium ion battery electrode material and preparation thereof, and application of current collector suitable for lithium ion battery electrode material
  • Current collector suitable for lithium ion battery electrode material and preparation thereof, and application of current collector suitable for lithium ion battery electrode material
  • Current collector suitable for lithium ion battery electrode material and preparation thereof, and application of current collector suitable for lithium ion battery electrode material

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preparation example Construction

[0041] A second aspect of the present invention provides a method for preparing a current collector suitable for lithium-ion battery electrode materials, comprising the following steps:

[0042] (1) prepare graphite oxide;

[0043] (2) calcining the product obtained in step (1), cooling to obtain expanded graphite;

[0044] (3) the product that step (2) obtains is processed into flexible graphite paper.

[0045] The preparation methods of flexible graphite (expanded graphite), that is, expanded graphite EG, mainly include chemical oxidation method, electrochemical method, gas phase diffusion method, liquid phase method, melting method, pressurization method, explosion method, etc.

[0046] Since graphite is a non-polar material, it is difficult to intercalate by using organic or inorganic acids with low polarity alone, and generally oxidizing agents must be used. The chemical oxidation method generally involves immersing natural flake graphite in a solution of an oxidizing a...

Embodiment 1

[0088] The preparation of embodiment 1 flexible graphite paper

[0089] Dissolve 0.5g of sodium nitrate in 70ml of 98% concentrated sulfuric acid in a three-necked flask, place it in an ice-water bath and stir for 10 minutes, the temperature in the reaction kettle is 25°C, and then slowly add 1g of sieved graphite passing through a 300-mesh sieve;

[0090] After stirring for 30 minutes, slowly add 3 g of potassium permanganate to the mixture in batches, control the temperature with an ice-water bath, keep the temperature at 25°C, and stir for 2 hours;

[0091]Move the three-necked flask to a constant temperature water bath at 35°C to react for 2 hours. During this period, stir continuously to obtain a brownish-yellow solution. Slowly add 200ml of deionized water dropwise. 1h; the mixture was diluted with 30°C water until the solution temperature was close to 30°C;

[0092] Add 5wt% hydrogen peroxide until a golden yellow solution is obtained, centrifuge the centrifuge, wash t...

Embodiment 2

[0097] The preparation of embodiment 2 electrode sheet

[0098] With the ternary material Li(Ni 0.5 co 0.2 mn 0.3 )O 2 As an active material, the flexible graphite paper of the present invention is used as a current collector, and the electrode preparation method formed is as follows:

[0099] The active material, conductive agent, and binder were mixed according to the mass ratio of 8:1:1 to prepare the electrode. The specific preparation process is as follows: first weigh 0.833g of a mass concentration of 7.5% binder PVDF solution (solvent is NMP), put it into a crucible, and add 2 to 3 drops of NMP solvent, and stir rapidly under a magnetic stirrer About 30 minutes to eliminate the bubbles in the binder; then weigh 0.0625g of conductive agent acetylene black, slowly add it into the crucible under stirring, when the slurry gradually becomes viscous, add a few drops of NMP solvent Adjust the thin consistency. After adding acetylene black, continue to stir at high speed f...

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Abstract

The present invention relates to a current collector suitable for a lithium ion battery electrode material. The electrode material comprises a cathode material and anode material. The cathode materialis a ternary material, the ternary material is shown by a formula LiNi1-x-yCoxMny, where 1-x-y>=0.5, 0.4>x>0, and 4>y>0. The anode material is artificial graphite, lithium titanate, soft carbon and hard carbon; and the current collector is a substance prepared based on natural graphite, and preferably flexible graphite paper. The present invention further relates to the preparation method of thecurrent collector. The flexible graphite paper prepared by employing the preparation method of the current collector is applied to the current collector of the ternary cathode material to make the polarity of the electrode small, make the activity of the electrode higher and make the charge-discharge performances of the battery better, and the flexible graphite paper is good in binding with the electrode material in the charging process, and is good in stability in the electrolyte. The current collector is wide in the sources of the raw materials, simple in conditions of the preparation method, and is better in performances than an aluminum foil taken as the current collector.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a current collector material capable of improving the performance of a lithium ion electrode material current collector and its preparation and application. Background technique [0002] With the continuous innovation of electronic products and new energy vehicles, lithium-ion batteries, as the core components, will continue to develop towards the trend of high energy density, high power density, long life, and low cost. In recent years, researchers' research on lithium-ion batteries has mainly focused on the research on electrode materials, however, no breakthrough has been made. Therefore, in order to develop high-performance, low-cost Li-ion batteries, it will be of great strategic importance to study other components than electrode materials. [0003] The current collector is one of the indispensable components of lithium-ion batteries. It can not only ...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525H01M4/1391
CPCY02E60/10
Inventor 高智朱晓沛张家文张媛娇沙金屈兴圆苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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