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Electrochemical device

An electrochemical, lithium-ion battery technology, applied in electrochemical generators, batteries, circuits, etc., can solve the problems of immature safety technology, safety problems, lithium-ion batteries, explosions, etc.

Inactive Publication Date: 2018-11-23
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the safety technology of lithium-ion batteries is currently immature, and occasionally there will be safety problems caused by external force piercing lithium-ion batteries on the user side (for example, causing lithium-ion batteries to explode)

Method used

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Examples

Experimental program
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Effect test

Embodiment 1-60

[0087] Aluminum foil is used as the positive electrode current collector, and lithium cobalt oxide slurry is uniformly coated on both surfaces of the aluminum foil. The composition of the lithium cobalt oxide slurry is 97.8wt% LiCoO 2 (LCO), 0.8wt% polyvinylidene fluoride (PVDF), and 1.4wt% conductive carbon black are dried and then cold pressed to prepare a positive pole piece. Using copper foil as the negative electrode current collector, the two surfaces of the copper foil are uniformly coated with artificial graphite slurry. The composition of the slurry is 97.7wt% artificial graphite, 1.3wt% carboxymethyl cellulose (CMC) and 1.0wt% styrene-butadiene The combination of rubber (SBR) is cold pressed and slit after drying; polymer particles (Examples 1-9 and 11-60) or block polymethyl methacrylate (molecular weight 7W) (implementation Example 10) Add polyvinylidene fluoride and about 65% by weight of N-methylpyrrolidone (NMP), disperse at a constant speed to obtain a coating sl...

Embodiment 61-63

[0091] Aluminum foil is used as the positive electrode current collector, and lithium cobalt oxide slurry is uniformly coated on both surfaces of the aluminum foil. The composition of the lithium cobalt oxide slurry is 97.8wt% LiCoO 2 (LCO), 0.8wt% polyvinylidene fluoride (PVDF) and 1.4wt% conductive carbon black, after drying, are cold pressed to prepare a positive pole piece. Using copper foil as the negative electrode current collector, the two surfaces of the copper foil are uniformly coated with artificial graphite slurry. The composition of the slurry is 97.7wt% artificial graphite, 1.3wt% carboxymethyl cellulose (CMC) and 1.0wt% styrene-butadiene The combination of rubber (SBR), followed by cold pressing and slitting, prepares a negative pole piece. The polymer particles are added to polyvinylidene fluoride and about 65% by weight of N-methylpyrrolidone (NMP), dispersed at a constant speed to obtain a polymer layer slurry, and a layer of polymerization is uniformly coated...

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Abstract

The invention relates to an electrochemical device with safety performance. Specifically, the invention provides the electrochemical device; the electrochemical device comprises a negative electrode piece, an isolation film and a polymer layer, wherein the negative electrode piece comprises a negative electrode active material layer; the polymer layer is arranged between the negative electrode active material layer and the isolation film; the polymer layer comprises polymer particles, wherein the degree of sphericity of the polymer particles in the embodiments of the invention is about 0.70-1.0. Non-conductive or poor-conductivity non-active materials (such as, non-conductive polymer particles) are arranged between the negative electrode active material layer and the isolation film, so that the negative electrode is effectively protected, and it is ensured that failure of the electrochemical device caused by internal short circuit generation in suffering from external force impact, nail penetrating or extrusion can be prevented.

Description

Technical field [0001] This application relates to an electrochemical device, and more specifically to an electrochemical device with nail penetration safety performance. Background technique [0002] Electrochemical devices (for example, lithium ion batteries) have entered our daily lives with advances in technology and environmental protection requirements. With the widespread popularity of lithium-ion batteries, most of the current mobile devices are powered by lithium-ion batteries, such as mobile phones and notebook computers. In addition, lithium-ion batteries have been actively developed to replace fossil fuels as energy supply devices for use in electric vehicles and hybrid vehicles. However, the safety technology of lithium-ion batteries is currently immature, and safety problems (such as causing lithium-ion batteries to explode) due to external forces piercing the lithium-ion batteries occasionally occur on the user side. Therefore, with the widespread popularity of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/36H01M4/62H01M10/0525H01M10/42H01M50/414H01M50/417H01M50/426H01M50/449
CPCH01M4/366H01M4/628H01M10/0525H01M10/4235H01M2200/30H01M50/426H01M50/414H01M50/417H01M50/449H01M10/052Y02E60/10H01M50/46H01M4/622H01M2200/00
Inventor 林超旺钟华炜杨帆苏义松
Owner NINGDE AMPEREX TECH
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