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A kind of electrode slurry and its preparation method and lithium ion battery electrode made therefrom

A lithium-ion battery and electrode slurry technology, applied in the field of lithium-ion batteries, can solve the problems of limited application scope, easy to be oxidized, unsuitable for positive electrodes, etc., and achieves strong segment mobility, enhanced adhesion, and improved liquid absorption rate effect

Active Publication Date: 2021-12-17
MINNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because SBR contains an internal double bond structure, it is easily oxidized and is not suitable for positive electrodes, which limits its scope of application.

Method used

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  • A kind of electrode slurry and its preparation method and lithium ion battery electrode made therefrom
  • A kind of electrode slurry and its preparation method and lithium ion battery electrode made therefrom
  • A kind of electrode slurry and its preparation method and lithium ion battery electrode made therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Coating the positive electrode slurry of the lithium ion battery on an aluminum foil to prepare the positive electrode of the lithium ion battery has a thickness of 50 microns. The weight ratio formula of each raw material in the slurry is: 60 parts of lithium iron phosphate, 15 parts of SP-Li, 15 parts of binder, and 30 parts of dispersion medium. Among them, the theoretical specific capacity of lithium iron phosphate is 170 mAh / g; the binder is acrylic acid / acrylate / acrylic acid block copolymer, and the structure of the block copolymer is R-AA 200 -b-MA 350 -b-AA 200 ; The dispersion medium is deionized water.

[0041] The lithium-ion battery cathode slurry is prepared through the following processing techniques:

[0042] ①Put SP-Li and lithium iron phosphate particles into a planetary high-energy ball mill for dry grinding for 100 minutes;

[0043] ②Transfer the material obtained in step ① to a self-rotating and revolving mixer, add all the binder according to th...

Embodiment 2

[0047] Coating the negative electrode slurry of the lithium ion battery on the copper foil to prepare the negative electrode of the lithium ion battery has a thickness of 50 microns. The weight ratio formula of each raw material in the slurry is: 60 parts of silicon, 15 parts of ketjen black, 15 parts of binder, and 30 parts of dispersion medium. Among them, the theoretical specific capacity of silicon is 4200 mAh / g; the binder is acrylic acid / acrylate / acrylic acid block copolymer, and the structure of the block copolymer is R-AA 700 -b-MA 200 -b-AA 700 ; The dispersion medium is distilled water.

[0048] The lithium-ion battery negative electrode slurry is prepared through the following processing techniques:

[0049] ① Ketjen black and silicon particles were put into a planetary high-energy ball mill for dry grinding for 100 minutes;

[0050] ②Transfer the material obtained in step ① to a self-rotating and revolving mixer, add all the binder according to the specific wei...

Embodiment 3

[0054] Coating the positive electrode slurry of the lithium ion battery on an aluminum foil to prepare the positive electrode of the lithium ion battery has a thickness of 300 microns. The weight ratio formula of each raw material in the slurry is: 90 parts of lithium cobaltate, 5 parts of conductive graphite, 5 parts of binder, and 400 parts of dispersion medium. Among them, the binder is acrylic acid / acrylic acid ester / acrylic acid block copolymer, and the structure of the block copolymer is R-AA 70 -b-MA 700 -b-AA 300 ; The dispersion medium is pure water.

[0055] The lithium-ion battery cathode slurry is prepared through the following processing techniques:

[0056] ①Put the conductive graphite and lithium cobaltate into the planetary high-energy ball mill for dry grinding for 30 minutes;

[0057] ②Transfer the material obtained in step ① to a self-rotating and revolving mixer, add all the binder according to the specific weight of the formula and the dispersion mediu...

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Abstract

The invention relates to the field of lithium-ion batteries, and discloses an electrode slurry prepared based on a block copolymer binder, a preparation method, and a lithium-ion battery electrode prepared therefrom. Wherein the lithium-ion battery electrode includes an electrode slurry and a conductive metal foil, and the electrode slurry is prepared from the following components in parts by weight: 50.0-90.0 parts of active material, 5.0-25.0 parts of conductive agent, and 5.0-25 parts of binder 25.0 parts, dispersion medium 30.0~400.0 parts; the binder uses acrylic acid / acrylic acid ester / acrylic acid block copolymer. The binder in the electrode provided by the present invention has a very high binding effect on the active material particles, and has high elasticity, which can effectively maintain the stability of the electrode structure in the cycle process, and can improve the liquid absorption rate of the electrolyte at the same time. Accelerating the conduction rate of lithium ions greatly improves the performance of lithium ion battery electrodes. At the same time, the present invention can maintain excellent stability during charging and discharging, and also exhibit excellent rate performance and cycle performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an electrode slurry prepared based on a block copolymer binder, a preparation method and a lithium ion battery electrode prepared therefrom. Background technique [0002] Since the advent of lithium-ion batteries, they have been widely used in electric vehicles, portable electronic products and other fields due to their advantages such as high specific capacity, long cycle life, and small self-discharge. For a long time, the battery life of portable electronic products is insufficient, and the capacity decays too fast. These problems are closely related to the active material, electrode structure, electrode binder, etc. in lithium-ion batteries. Among them, although the electrode binder only accounts for a small part of the electrode system, it occupies an important position and has a direct impact on the charge and discharge rate and cycle performance of the battery. [00...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/04H01M4/139H01M4/13H01M10/0525
CPCH01M4/04H01M4/13H01M4/139H01M4/622H01M10/0525Y02E60/10
Inventor 黄杰施林娜钟玮杨梅梅刘雨雪
Owner MINNAN NORMAL UNIV