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High-safety lithium ion battery anode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied to battery electrodes, circuits, electrical components, etc., to achieve the effect of ensuring safety and avoiding thermal runaway

Active Publication Date: 2018-06-08
内蒙古欣源石墨烯科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention discloses a high-safety lithium-ion battery negative electrode material and its preparation method, which solves the defects existing in the safety performance of the current lithium-ion battery, improves the safety performance of the material by coating and modifying the surface of the material, and simultaneously takes into account the magnification of the material performance and cycle performance

Method used

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  • High-safety lithium ion battery anode material and preparation method thereof
  • High-safety lithium ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step ① Binder configuration:

[0018] 70g of polyvinylidene fluoride, 19g of sodium carboxymethyl cellulose, 5g of polyvinyl alcohol, 5g of polyacrylic acid, and 1g of ethylene carbonate were mixed and added to 100ml of N-methylpyrrolidone, and mixed for 3 hours by a high-speed disperser to obtain a compound binder;

[0019] Step ② Dissolve 8g of melamine cyanurate and 2g of composite binder in 500ml of N-methylpyrrolidone and disperse evenly at high speed as functional coating solution A for future use;

[0020] At the same time, weigh 8g of asphalt and add it to 500ml of carbon tetrachloride to completely dissolve to obtain solution B; then add 0.3g of lithium metaaluminate and 0.3g of carbon nanotubes to 0.9g of composite binder and stir evenly before adding into solution B, and uniformly disperse through a high-speed disperser to obtain asphalt coating solution C;

[0021] Step ③: Add 100g of graphite to the functional coating solution A, stir evenly, and spray dr...

Embodiment 2

[0024] Step ① Binder configuration:

[0025] 60g polyvinylidene fluoride, 20g sodium carboxymethyl cellulose, 9.5g polyvinyl alcohol, 10g polyacrylic acid, 0.5g ethylene carbonate are mixed and added to 100ml of N-methylpyrrolidone, and mixed for 3 hours by a high-speed disperser get composite binder;

[0026] Step ② Dissolve 9g of pentaerythritol melamine phosphate and 1g of composite binder in 500ml of N-methylpyrrolidone and disperse evenly at high speed as functional coating solution A for future use;

[0027] At the same time, weigh 9g of asphalt and add it to 500ml of carbon tetrachloride to completely dissolve to obtain solution B; then add 0.1g of lithium metaaluminate and 0.1g of carbon nanotubes to 0.8g of composite binder and stir evenly before adding into solution B, and uniformly disperse through a high-speed disperser to obtain asphalt coating solution C;

[0028] Step ③: Add 100g of graphite to the functional coating liquid A, stir evenly, and spray drying met...

Embodiment 3

[0031] Step ① Binder configuration:

[0032] 80g polyvinylidene fluoride, 10g sodium carboxymethyl cellulose, 5g polyvinyl alcohol, 4g polyacrylic acid, 1g ethylene carbonate are mixed and added to 100ml of N-methylpyrrolidone, and mixed by a high-speed disperser for 3 hours to obtain a compound binder;

[0033] Step ② Sprinkle 8g of ammonium polyphosphate and 2g of composite binder in 500ml of N-methylpyrrolidone and disperse evenly at high speed as functional coating solution A for future use;

[0034] At the same time, weigh 8g of asphalt and add it to 500ml of carbon tetrachloride to completely dissolve to obtain solution B; then add 0.5g of lithium metaaluminate and 0.5g of carbon nanotubes to 0.1g of composite binder and stir evenly before adding into solution B, and uniformly disperse through a high-speed disperser to obtain asphalt coating solution C;

[0035] Step ③: Add 100g of graphite to the functional coating liquid A, stir evenly, and spray drying method, the d...

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Abstract

The invention discloses a high-safety lithium ion battery anode material and a preparation method thereof and relates to the field of preparation of battery materials, in particular to the field of ananode material of lithium ion batteries. The anode material is characterized by consisting of a core, a middle layer and an outer layer and adopts a core-shell structure; the middle layer consists ofa functional compound containing nitrogen or phosphorus and a binder; the outer layer consists of asphalt, lithium metaaluminate, carbon nanotubes and a binder. The defects of the lithium ion batteries in the safety performance at present are overcome, the safety performance of the material is improved through coating modification of the material surface, and meanwhile, the rate performance and cycle performance of the material are both considered.

Description

technical field [0001] The invention relates to the field of battery material preparation, in particular to the field of negative electrode materials for lithium ion batteries. Background technique [0002] The anode material is a key component of the lithium-ion battery, and its performance plays an important role in the cycle performance, rate performance and safety performance of the lithium-ion battery. The current market-oriented anode material is mainly graphite, although Graphite materials are favored by people because of their low price, high stability, and excellent cycle performance. However, due to the small interlayer spacing of graphite materials, when lithium-ion batteries are charged and discharged under high-rate conditions, lithium ions are in the negative electrode. The accumulation of lithium dendrites on the surface poses a safety hazard. In order to improve the safety performance of negative electrode materials, material surface coating modification is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/62
CPCH01M4/133H01M4/1393H01M4/623Y02E60/10
Inventor 薛永谢志懋
Owner 内蒙古欣源石墨烯科技股份有限公司
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