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Lithium-ion battery and its outer packaging film and preparation method of outer packaging film

A lithium-ion battery and outer packaging film technology, applied in the field of lithium-ion batteries, can solve problems such as failure to be applied on a large scale, increased electrolyte viscosity, increased battery polarization, etc., to prevent chain exothermic reactions, Effect of preventing further deterioration and improving safety performance

Active Publication Date: 2018-02-27
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the above-mentioned flame retardant additives are added in a small amount in the electrolyte, it is difficult to achieve the purpose of flame retardancy; Battery capacity, rate performance and cycle performance are significantly reduced
The above problems have led to the use of flame retardant additives to improve the safety performance of lithium-ion batteries has not been applied on a large scale

Method used

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  • Lithium-ion battery and its outer packaging film and preparation method of outer packaging film
  • Lithium-ion battery and its outer packaging film and preparation method of outer packaging film
  • Lithium-ion battery and its outer packaging film and preparation method of outer packaging film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Mix 20wt.% perfluorononylphenol polyoxyethylene ether phosphate (Mn: 10,000) with 80wt.% NMP to obtain a mixed slurry, and then spray the mixed slurry on the purchased 115μm soft pack battery packaging film material, and baked at 100°C for 4 hours, and the thickness of the coating was controlled to be about 5 μm to obtain the battery outer packaging film of this example; Electrolyte solution and seal, obtain lithium ion battery sample A.

[0038] The battery outer packaging film that the embodiment of the present invention 1 makes is as follows figure 1 As shown, it includes an outer layer of polyolefin material 10 , a layer of metal material 12 , an inner layer of polyolefin material 14 and a layer of polyphosphate compound 16 attached to the surface of the inner layer of polyolefin material 14 .

Embodiment 2

[0040] 40wt.% polyethylene glycol ether phosphate (Mn: 300,000) was mixed with 60wt.% NMP to obtain a mixed slurry, and then the mixed slurry was sprayed on the purchased 86 μm soft pack battery packaging film, and the Bake at 90°C for 6 hours, control the coating thickness to about 30 μm, and obtain the battery outer packaging film of this example; put the wound battery core into the battery outer packaging film after punching, inject electrolyte and seal , to obtain Li-ion battery sample B.

Embodiment 3

[0042] Mix 80wt.% polyoxyethylene alkyl ether phosphate (Mn: 1,000) with 20wt.% NMP to obtain a mixed slurry, then spray the mixed slurry on the purchased 115 μm soft pack battery packaging film, and Bake at 120°C for 2.5 hours, control the coating thickness to about 20 μm, and obtain the battery outer packaging film of this example; put the wound battery core into the battery outer packaging film after punching, and inject electrolyte And sealed to obtain lithium ion battery sample C.

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Abstract

The invention discloses an outer packing film of a lithium ion battery. The outer packing film comprises an inner polyolefin material layer, an outer polyolefin material layer and a metal material layer positioned between the two polyolefin material layers, wherein a polyphosphoester compound is contained in the layer or the surface of the inner polyolefin material layer. Compared with the prior art, the outer packing film provided by the invention has the advantages that the polyphosphoester compound which is hard to dissolve is composited on an outer packing film of a battery, and the purpose that the security problem of the lithium ion battery is remarkably improved on the basis of not affecting the energy density of the battery is achieved; in addition, the invention also discloses the lithium ion battery and a preparation method of the outer packing film of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically, the invention relates to a safe lithium-ion battery outer packaging film and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in many fields because of their advantages such as high specific capacity, high working voltage, wide working temperature range, low self-discharge rate, long cycle life, no pollution, and light weight. However, in the case of improper use of lithium-ion batteries, such as mechanical damage, high-temperature environment, etc., it may cause a short circuit due to direct contact between the positive and negative electrodes. After the battery is short-circuited, it will release a large amount of heat in a short time, sometimes causing The battery catches fire or even explodes, seriously endangering the safety of users. [0003] At present, one of the methods to solve the above safety problems o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/08B32B37/14H01M10/0525
CPCY02E60/10
Inventor 安伟峰
Owner DONGGUAN AMPEREX TECH