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Lithium ion battery pole piece slurry, pole piece and preparation method and application thereof

A technology of lithium-ion batteries and electrode active materials, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as pole piece fracture and graphite shedding, reduce fracture, improve cycle life, and solve The effect of the fracture problem

Active Publication Date: 2019-11-15
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding a flexibilizer to the pole piece slurry, the present invention well solves the problem that the positive pole piece breaks due to the use of high nickel material and high compaction density process, and improves the processing yield of the positive pole piece And the safety of use; at the same time, it solves the problem of graphite falling off due to the use of high-gram capacity graphite and the use of high-pressure compaction technology, and improves the service life of the negative electrode.

Method used

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  • Lithium ion battery pole piece slurry, pole piece and preparation method and application thereof
  • Lithium ion battery pole piece slurry, pole piece and preparation method and application thereof
  • Lithium ion battery pole piece slurry, pole piece and preparation method and application thereof

Examples

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Effect test

preparation example 1

[0066] A preparation method of lithium ion battery positive electrode sheet slurry, which comprises:

[0067] The ternary material (NCM) is used as the positive electrode active material, carbon black (SP) is used as the conductive agent, polyvinylidene fluoride (PVDF) is used as the binder, and N-methylpyrrolidone (NMP) is used as the solvent. Agent 1,2-propanediol, NCM:SP:PVDF=98:1:1 according to the solid weight ratio, the slurry solid content is 78%, wherein NMP:1,2-propanediol=98:2 (volume ratio); Stir and mix the above materials uniformly at a temperature of 30° C. to obtain positive electrode slurry.

preparation example 2

[0069] A preparation method of lithium ion battery negative electrode sheet slurry, which comprises:

[0070] Graphite (AG) is used as the negative electrode active material, styrene-butadiene rubber (SBR) is used as the binder, carboxymethyl cellulose (CMC) is used as the dispersant, carbon black (SP) is used as the conductive agent, and distilled water is used as the solvent, 1, 2-propylene glycol is a flexible agent, and the above-mentioned raw materials are stirred and mixed according to the ratio AG:SBR:CMC:SP=96:1.5:1:1.5 to form a negative electrode slurry, and the solid content of the slurry is 50%, wherein distilled water: 1,2 - Propylene glycol weight ratio = 99:1 (volume ratio); then the above materials were stirred and mixed evenly at a temperature of 30° C. to obtain negative electrode slurry.

preparation example 3

[0072] Compared with Preparation Example 1, only the softening agent was replaced with 1,2-butanediol by 1,2-propanediol.

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Abstract

The invention relates to lithium ion battery pole piece slurry, a pole piece and a preparation method and an application thereof. The pole piece slurry comprises an electrode active material, a conductive agent, a binder, a solvent and a flexibilizer, wherein the flexibilizer is alcohol with the carbon number of 2-5, and the volume percentage of the flexibilizer is 0.1-15% if it is assumed that the sum of the contents of the solvent and the flexibilizer is 100%. When the pole piece is prepared, the pole piece is prepared by mixing the flexibilizer into the pole piece slurry or coating the surface of the prepared pole piece with the flexibilizer so as to obtain a pole piece with low hardness and brittleness. Meanwhile, the invention further provides a method for reducing the fracture of thepole piece, which is realized by adding the flexibilizer into the pole piece. The probability of breakage of the positive pole piece provided by the invention in the processing and using processes isgreatly reduced, the processing yield and the use safety of the lithium ion battery are improved, the problem that powder falls off in the charging and discharging processes of the negative electrodeis overcome, and the service life of the lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a lithium-ion battery pole piece slurry, a pole piece and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of no pollution, high energy density and power density, high voltage, long cycle life, small self-discharge, and no memory effect. They have been widely used in portable electronic devices such as smartphones, notebooks, and tablet computers. With the development of electric vehicles, lithium batteries have also been widely used as power batteries for vehicles. With the popularity of electric vehicles, consumers urgently need a high-energy-density power lithium-ion battery to meet the demand for increased mileage and extended service life of electric vehicles. [0003] At present, in order to improve the energy density and cycle life of lithium-ion batteries, the technical means commonly used by re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M10/0525
CPCH01M4/62H01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 王汭姚毅於洪将邹武元姜斌杨月球
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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