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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  • Abstract
  • Description
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  • 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 colle

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

Examples

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Example Embodiment

[0041] The second aspect of the present invention is to provide a method for preparing a current collector suitable for a lithium ion battery electrode material, including the following steps:

[0042] (1) Preparation of graphite oxide;

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

[0044] (3) Process the product obtained in step (2) into flexible graphite paper.

[0045] The preparation methods of flexible graphite (expanded graphite), namely expanded graphite EG, mainly include chemical oxidation, electrochemical, vapor phase diffusion, liquid phase, melting, pressure, explosion, etc.

[0046] Since graphite is a non-polar material, it is difficult to intercalate with organic or inorganic acids with low polarity, and oxidants must generally be used. The chemical oxidation method is generally to soak natural flake graphite in a solution of oxidant and intercalant. Under the action of strong oxidant, the graphite is oxidized and the n...

Example Embodiment

[0088] Example 1 Preparation of 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 reactor is 25°C, and then slowly add 1g of sieved graphite that has passed through a 300-mesh sieve;

[0090] After stirring for 30 minutes, slowly add 3 g of potassium permanganate to the mixed solution in batches, use an ice water bath to control the temperature, 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 and react for 2 hours. Stir continuously during this period to obtain a brownish yellow solution. Add 200ml of deionized water slowly. During the period, the temperature rises sharply. Control the dropping rate to maintain the system temperature at 80~85°C. 1h; continue to dilute the mixture with water at 30°C until the temperature of the solution approa...

Example Embodiment

[0097] Example 2 Preparation of electrode sheet

[0098] Based on the ternary material Li(Ni 0.5 Co 0.2 Mn 0.3 )O 2 As the active material, the flexible graphite paper of the present invention is used as the current collector, and the electrode preparation method is as follows:

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

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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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