Lithium battery negative plate loaded with temperature-resistant composite layer and preparation method

A technology for negative pole pieces and lithium batteries, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve problems such as thermal runaway and lithium battery thermal runaway, and achieve improved temperature resistance, good safety and usability, The effect of high ionic conductivity

Active Publication Date: 2021-01-22
山东亿维新材料有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the current problem that lithium batteries are prone to thermal runaway at high temperatures, the present invention proposes a lithium battery negative pole piece loaded with a temperature-resistant composite layer and a preparation method, thereby improving the temperature resistance of the lithium battery and ensuring ion conductivity. Effectively solve the problem of "thermal runaway" of lithium batteries

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  • Lithium battery negative plate loaded with temperature-resistant composite layer and preparation method

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Effect test

Embodiment 1

[0042] (1) Mix 90kg of carbon material, 2.5kg of polyvinylidene fluoride, and 3kg of Super-P evenly, prepare a slurry, and then coat it on the surface of copper foil, then dry it, collect it, and obtain the negative electrode sheet;

[0043] (2) Add 15kg of polyvinylidene fluoride-hexafluoropropylene copolymer into 40kg of acetone and 60kg of N,N-dimethylformamide mixed solvent, then stir at 345°C for 75 minutes until completely dissolved to obtain a mixed solution;

[0044] (3) Put 22kgLi 6.75 La 3 Zr 1.75 Ta 0.25 o 12 , 3kg of polyethylene oxide, and 2kg of graphene oxide powder were added to 125 kg of the obtained mixed solution to configure suspension A, then the suspension A was stirred at 65°C for 1.5 hours, and then sprayed on the surface of the negative electrode sheet under high pressure , and then dried in a vacuum oven for 35 minutes to remove the solvent to obtain a negative electrode sheet with a porous conductive layer with an average film thickness of 25 μm;...

Embodiment 2

[0047] (1) Mix 85kg of silicon-carbon composite material, 3kg of polyvinylidene fluoride, and 4kg of Super-P evenly, prepare a slurry, and then coat it on the surface of copper foil, then dry it, collect it, and obtain the negative electrode sheet;

[0048] (2) Add 13kg of polyvinylidene fluoride-hexafluoropropylene copolymer into 35kg of acetone and 65kg of N,N-dimethylformamide mixed solvent, then stir at 40°C for 90 minutes until completely dissolved to obtain a mixed solution;

[0049] (3) Put 20kgLi 6.75 La 3 Zr 1.75 Ta 0.25 o 12 , 2kg polyethylene oxide, and 1.5kg graphene oxide powder were added to 140 kg of the obtained mixed solution, and configured as suspension A, then the suspension A was stirred at 60°C for 2 hours, and then sprayed on the surface of the negative electrode sheet under high pressure , and then dried in a vacuum oven for 32 minutes to remove the solvent to obtain a negative electrode sheet with a porous conductive layer with an average film thic...

Embodiment 3

[0052] (1) Mix 95kg of carbon material, 2kg of polyvinylidene fluoride, and 2kg of Super-P evenly, prepare a slurry, and then coat it on the surface of copper foil, then dry it, collect it, and obtain the negative electrode sheet;

[0053] (2) Add 18kg of polyvinylidene fluoride-hexafluoropropylene copolymer into 45kg of acetone and 55kg of N,N-dimethylformamide mixed solvent, and then stir at 50°C for 60 minutes until completely dissolved to obtain a mixed solution;

[0054] (3) Put 25kgLi 6.75 La 3 Zr 1.75 Ta 0.25 o 12 , 4kg of polyethylene oxide, and 2.5kg of graphene oxide powder were added to 110 kg of the obtained mixed solution to form a suspension A, then the suspension A was stirred at 70°C for 1 hour, and then sprayed on the surface of the negative electrode sheet under high pressure , and then dried in a vacuum oven for 38 minutes to remove the solvent to obtain a negative electrode sheet with a porous conductive layer with an average film thickness of 28 μm;

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Abstract

The invention provides a lithium battery negative plate loaded with a temperature-resistant composite layer and a preparation method. The lithium battery negative plate is prepared by spraying a turbid liquid B on the negative plate loaded with a porous conductive layer, and the turbid liquid B is prepared by adding an inorganic temperature-resistant material into a mixed solution; the negative plate loaded with the porous conductive layer is prepared by spraying a turbid liquid A on the negative plate, the turbid liquid A is prepared by adding an inorganic lithium ion conductor, polyoxyethylene and graphene oxide powder into a mixed solution, and the negative plate is prepared by mixing a negative active material, polyvinylidene fluoride and a conductive agent and coating a copper foil with the mixture, wherein the mixed solution is prepared by dissolving a polyvinylidene fluoride hexafluoropropylene copolymer in a mixed solvent of acetone and N, N-dimethylformamide. The lithium battery negative plate provided by the invention not only has good temperature resistance, but also has high ionic conductivity and good safety and usability, and meanwhile, the preparation process is simple and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium battery negative poles, in particular to a lithium battery negative pole piece loaded with a temperature-resistant composite layer and a preparation method thereof. Background technique [0002] Lithium battery, as a new generation of energy battery, has become a typical representative of new energy due to its low cost, high performance, high power, green environment and many other advantages. It is widely used in 3C digital products, mobile power and electric vehicles and other fields. In recent years, with the intensification of environmental pollution and the guidance of national policies, the demand for lithium batteries in the electric vehicle market has continued to increase, and lithium batteries have become the key development content of new energy materials. [0003] With the application and promotion of lithium batteries, battery safety issues have attracted extensive attention in the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/62H01M4/38H01M4/587H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/386H01M4/587H01M4/624H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 陈庆廖健淞白涛李钧
Owner 山东亿维新材料有限责任公司
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