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A kind of high flame retardant and high thermal conductivity lithium battery separator and preparation method thereof

A lithium battery separator, high thermal conductivity technology, used in secondary batteries, battery pack parts, secondary battery repair/maintenance, etc. Chemical time, enhance heat dissipation, improve the effect of flame retardant performance

Active Publication Date: 2022-08-05
山西厚生新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of poor flame retardancy and thermal conductivity of polyolefin polymer separators, a lithium battery separator with high flame retardancy and high thermal conductivity and its preparation method are provided

Method used

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  • A kind of high flame retardant and high thermal conductivity lithium battery separator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A high flame-retardant and high thermal conductivity lithium battery separator, comprising the following raw materials in parts by weight: 30 parts of ultra-high molecular weight polyethylene, 5 parts of aluminum nitride, 3 parts of boron nitride, 3 parts of silicon carbide, 8 parts of core-shell flame retardant, 2 parts of aluminum diethylphosphinate and 0.5 part of silane coupling agent.

[0034] The preparation method of the above-mentioned high flame retardant and high thermal conductivity lithium battery separator comprises the following steps:

[0035] (1) Weigh aluminum nitride, boron nitride, silicon carbide, core-shell flame retardant, aluminum diethylphosphinate, and silane coupling agent according to the proportions and place them in ethanol, and stir to form a resistance with a solid content of 30 wt%. Burn high thermal conductivity suspension, stirring speed is 100rpm, stirring time is 30min;

[0036](2) Weighing ultra-high molecular weight polyethylene ac...

Embodiment 2

[0042] A high flame-retardant and high thermal conductivity lithium battery separator, comprising the following raw materials in parts by weight: 30 parts of ultra-high molecular weight polyethylene, 10 parts of aluminum nitride, 3 parts of boron nitride, 3 parts of silicon carbide, 8 parts of core-shell flame retardant, 2 parts of aluminum diethylphosphinate and 0.5 part of silane coupling agent.

[0043] The preparation method is the same as that of Example 1.

Embodiment 3

[0045] A highly flame-retardant and high thermal conductivity lithium battery separator, comprising the following raw materials in parts by weight: 30 parts of ultra-high molecular weight polyethylene, 10 parts of aluminum nitride, 1 part of boron nitride, 1 part of silicon carbide, 8 parts of core-shell flame retardant, 2 parts of aluminum diethylphosphinate and 0.5 part of silane coupling agent.

[0046] The preparation method is the same as that of Example 1.

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Abstract

The invention relates to a high flame-retardant and high thermal conductivity lithium battery separator and a preparation method thereof. parts, 1-3 parts of aluminum diethylphosphinate, and 0.1-1 part of silane coupling agent are placed in ethanol and stirred to form a suspension; then 20-40 parts of ultra-high molecular weight polyethylene are mixed with the above two suspensions. After mixing, drying, adding 60-80 parts of white oil, melt extrusion, biaxial stretching, white oil extraction, heat setting, and winding to obtain a high flame-retardant and high thermal conductivity lithium battery separator. The invention adds a composite flame retardant system and a high thermal conductivity inorganic filler to the lithium battery separator to form a flame retardant network and a thermal conductivity network connected by bridges, improve the flame retardancy and thermal conductivity of the separator, and solve the problem of the lithium battery from the two aspects of thermal conductivity and flame retardant. security issues.

Description

technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to a high flame-retardant and high thermal conductivity lithium battery separator and a preparation method thereof. Background technique [0002] According to the roadmap of lithium-ion batteries for EVs, the goal is to achieve an energy density of 300Wh kg of lithium-ion batteries by 2020. -1 Above, the battery pack level reaches 200Wh kg -1 , which indicates that the range level of electric vehicles can reach 400km or more. For power batteries, there are hundreds or even tens of thousands of lithium-ion batteries in the battery pack, which greatly increases the probability of safety risks. Due to the huge energy contained in the power battery pack, it is easy to induce vicious accidents, resulting in casualties and property losses. The safety design of lithium batteries has become a key factor that cannot be ignored. [0003] Lithium-ion batteries are mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/417H01M50/403H01M50/463H01M10/0525H01M10/42
CPCH01M10/4235H01M10/0525Y02E60/10
Inventor 巢雷李正林沈亚定盛夏
Owner 山西厚生新材料科技有限公司