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High-safety lithium ion battery negative pole piece

A technology of lithium ion battery and negative pole piece, which is applied to battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc., to achieve the effect of improving thermal stability, good effect, and simple and easy method.

Inactive Publication Date: 2020-10-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on optimizing the design of the battery preparation process to improve the safety performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of the negative electrode: ① first add sodium carboxymethylcellulose (CMC) and deionized water to make glue, after the glue is finished, let it stand for defoaming for later use; ② add superconducting carbon black (SP) to the CMC glue for Knead, add erythritol and nano-alumina particles at the same time, continue to stir and knead; ③ continue to add active substance mesophase carbon microspheres to the glue solution and stir and knead; ④ finally add styrene-butadiene rubber (SBR) binder, stir Homogenize, at the same time adjust the viscosity of the slurry by adding a small amount of water several times, sieve the material after the viscosity is qualified, and obtain the negative electrode slurry for later use; ⑤ Coat the negative electrode slurry on the current collector, then dry it, and then pass it Press to get the negative electrode sheet, and store it in vacuum for subsequent use; wherein, the weight percentage of active material, conductive agent, dispe...

Embodiment 2

[0025] Preparation of the negative electrode: ① first add sodium carboxymethylcellulose (CMC) and deionized water to make glue, after the glue is finished, let it stand for defoaming for later use; ② add superconducting carbon black (SP) to the CMC glue for Knead, add erythritol and nano-alumina particles at the same time, continue to stir and knead; ③continue to add the active substance natural graphite to the glue solution to stir and knead; ④finally add styrene-butadiene rubber (SBR) binder, stir and homogenate, At the same time, the viscosity of the slurry is adjusted by adding a small amount of water several times, and the slurry is sieved and discharged after the viscosity is qualified to obtain the negative electrode slurry for later use; Negative pole piece, stored in vacuum for later use; wherein, the weight percentage of active material, conductive agent, dispersant and water-based binder is 96:1:1.5:1.5, and the consumption of erythritol is 1% of active material weig...

Embodiment 3

[0029] Preparation of the negative electrode: ① first add sodium carboxymethylcellulose (CMC) and deionized water to make glue, after the glue is finished, let it stand for defoaming for later use; ② add superconducting carbon black (SP) to the CMC glue for Knead, add erythritol and nano-alumina particles at the same time, continue to stir and knead; ③Continue to add active material silicon / carbon material to the glue, stir and knead; ④Finally add styrene-butadiene rubber (SBR) binder, stir well At the same time, the viscosity of the slurry is adjusted by adding a small amount of water several times. After the viscosity is qualified, the material is sieved to obtain the negative electrode slurry for use; ⑤ Coat the negative electrode slurry on the current collector, then dry it, and then roll it , to get the negative electrode sheet, and store it in vacuum for subsequent use; wherein, the weight percentage of active material, conductive agent, dispersant and aqueous binder is 9...

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Abstract

The invention discloses a high-safety lithium ion battery negative pole piece, and relates to the technical field of lithium ion batteries. The high-safety lithium ion battery negative pole piece is prepared by coating, drying and rolling negative pole slurry after slurry mixing, and the negative pole slurry contains erythritol and nano alumina particles. According to the invention, the design process of the negative pole piece is optimized, the safety performance of the battery is improved by adding the erythritol material with high phase change latent heat and the aluminum oxide nanoparticles with good thermal stability. By using the high phase change heat of the erythritol material, the heat generated during the abuse of the battery can be rapidly absorbed so as to effectively prevent the thermal runaway spreading, and the added nanometer alumina particles can make up the thermal conductivity defect of the erythritol. Different from a traditional method, the phase change material directly acts on the internal pole piece of the battery, the idea is novel, the negative pole piece is assembled into the whole battery, the passing rate is greatly improved when the safety performancesuch as short circuit, overcharge and heating of the whole battery is tested, and the high-safety design target is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-safety lithium-ion battery negative pole piece. Background technique [0002] Due to the advantages of good reversibility, long cycle life, high energy density, no memory effect, and environmental friendliness, lithium-ion batteries are widely used in various digital electronic devices, and also have broad applications in the fields of electric vehicles and energy storage power stations. Application prospect. The key to the current lithium-ion battery technology lies in the two technical indicators of safety performance and capacity, among which safety performance is the core. Safety performance involves all aspects of lithium-ion batteries, and its core lies in cycle stability, thermal stability, mechanical stability, electrochemical stability, etc. In recent years, with the upgrading and upgrading of positive and negative electrode materials, modification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/133H01M4/134H01M10/42H01M10/653H01M10/654H01M10/659H01M10/0525
CPCH01M4/62H01M4/133H01M4/134H01M10/4235H01M10/654H01M10/659H01M10/653H01M10/0525Y02E60/10
Inventor 段锐王金龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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