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Battery electrode piece and preparation method thereof

A battery pole piece and pole piece technology, applied in the field of battery pole piece and its preparation, can solve the problems of difficulty in intercalation and extraction of lithium ions, poor electrolyte wettability, poor cycle stability, etc., so as to improve Coulomb efficiency and cycle performance. , Easy to insert and remove, improve the effect of wetting performance

Inactive Publication Date: 2020-09-18
EVE HYPERPOWER BATTERIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still cannot effectively solve the problems of increased battery internal resistance, poor electrolyte wetting performance, difficulty in intercalation and extraction of lithium ions, reduced discharge capacity, and poor cycle stability caused by high-thickness and high-density pole pieces.

Method used

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  • Battery electrode piece and preparation method thereof
  • Battery electrode piece and preparation method thereof
  • Battery electrode piece and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0029] For an implementation, see figure 1 , a method for preparing a battery pole piece, comprising the following steps:

[0030] S110, uniformly mix the positive / negative active material, conductive agent and binder to obtain a slurry; wherein, the mass ratio of the positive / negative active material, the conductive agent and the binder is (90-98 ):(0.5~5):(45~150).

[0031] It should be noted that the content of positive / negative active materials is related to the energy density of the battery. Increasing the content of positive / negative active materials within a certain range can increase the energy density of the battery, but if the content of positive / negative active materials is too high , it will cause the electrical conductivity and bonding performance of the slurry to drop significantly, and even cause the positive / negative active material to fall off, so the mass ratio of the positive / negative active material, the conductive agent and the binder is preferably (90~9...

Embodiment 1

[0061] S111, uniformly mix the positive / negative active material, the conductive agent and the binder to obtain a slurry; wherein, the mass ratio of the positive / negative active material, the conductive agent and the binder is (90-98 ):(0.5~5):(45~150). Wherein, the slurry ratio of the positive electrode is LCO:SP:CNT:PVDF=97.6:0.85:0.7:0.85, and the slurry ratio of the negative electrode is C:SP:CMC:SBR=95:2:1.5:1.5.

[0062] S121, coating the slurry on the current collector for the first time, and performing the first cold pressing after drying to form a high-compact coating on the current collector, the high-compact coating and the The above-mentioned current collectors together constitute the prepared pole piece.

[0063] S131, coating the slurry on the high-compact coating for the second time, and rolling for the second time after drying to form a low-compact coating on the high-compact coating, The low compaction coating and the preliminary pole piece together constitu...

Embodiment 2

[0065] S112, uniformly mix the positive / negative active material, conductive agent and binder to obtain a slurry; wherein, the mass ratio of the positive / negative active material, the conductive agent and the binder is (90-98 ):(0.5~5):(45~150). Wherein, the slurry ratio of the positive electrode is LCO:SP:CNT:PVDF=97.6:0.85:0.7:0.85, and the slurry ratio of the negative electrode is C:SP:CMC:SBR=95:2:1.5:1.5.

[0066] S122, coating the slurry on the current collector for the first time, and performing the first roll pressing after drying to form a high-compact coating on the current collector, the high-compact coating and the high-compact coating The above-mentioned current collectors together constitute the prepared pole piece.

[0067] S132, coating the slurry on the high-compaction coating for the second time, and rolling for the second time after drying to form a low-compaction coating on the high-compaction coating, The low compaction coating and the preliminary pole p...

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Abstract

The invention relates to the technical field of batteries, and discloses a battery electrode piece and a preparation method thereof. The preparation method comprises the following steps: coating a current collector with slurry for the first time, and performing rolling for the first time after drying is conducted, so that a high-compaction coating is formed on the current collector, and the high-compaction coating and the current collector jointly form a prepared electrode piece; coating the slurry on the high-compaction coating for the second time, performing drying and rolling for the secondtime to form a low-compaction coating on the high-compaction coating, and forming the battery electrode piece by the low-compaction coating and the prepared electrode piece. The battery electrode piece prepared by the method provided by the invention can effectively reduce the internal resistance of the battery, improve the electrolyte infiltration performance, increase the discharge capacity andimprove the coulombic efficiency and cycle performance while maintaining the high energy density of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery pole piece and a preparation method thereof. Background technique [0002] As a secondary energy source, lithium-ion batteries have the advantages of high energy density, high operating voltage, wide operating temperature range, small size, and light weight. They are widely used in digital equipment, power vehicles, and energy storage. In the application of lithium-ion batteries, especially in electric vehicles, the energy density of batteries is the main factor restricting the development of lithium-ion batteries. At present, scientific researchers have done extensive research on how to improve the energy density of lithium-ion batteries, mainly including the following methods: 1. Select high-performance battery materials: high-performance positive and negative electrode materials, thin or porous foils and Diaphragm, high-voltage electrolyte, solid electrolyte, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/0525H01M10/058
CPCH01M4/0404H01M4/043H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王忠明崔云王理祝媛刘建华
Owner EVE HYPERPOWER BATTERIES INC
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