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High-flame-retardant high-thermal-conductivity lithium battery diaphragm and preparation method thereof

A lithium battery diaphragm, high thermal conductivity technology, applied in secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve the problems of poor flame retardancy and thermal conductivity of polyolefin polymer diaphragms, and improve heat dissipation Performance and safety, improvement of thermal conductivity, effect of large specific surface area

Active Publication Date: 2021-03-09
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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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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  • High-flame-retardant high-thermal-conductivity lithium battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A lithium battery separator with high flame resistance and high thermal conductivity, 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, 0.5 parts 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) Take aluminum nitride, boron nitride, silicon carbide, core-shell flame retardant, aluminum diethylphosphinate, and silane coupling agent in ethanol according to the proportioning ratio, and stir to form a flame retardant with a solid content of 30wt%. Combustion of high thermal conductivity suspension, the stirring speed is 100rpm, and the stirring time is 30min;

[0036](2) Weighing ultra-high molecular w...

Embodiment 2

[0042] A lithium battery separator with high flame retardancy and high thermal conductivity, 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, 0.5 parts of silane coupling agent.

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

Embodiment 3

[0045] A lithium battery separator with high flame resistance and high thermal conductivity, 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, 0.5 parts of silane coupling agent.

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

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Abstract

The invention relates to a high-flame-retardant high-thermal-conductivity lithium battery diaphragm and a preparation method thereof. The preparation method comprises the following steps of putting 5-10 parts of aluminum nitride, 1-3 parts of boron nitride, 1-3 parts of silicon carbide, 5-10 parts of a core-shell flame retardant, 1-3 parts of aluminum diethylphosphinate and 0.1-1 part of a silanecoupling agent into ethanol, and stirring to form a suspension, and mixing 20-40 parts of ultra-high molecular weight polyethylene with the two suspensions, drying, adding 60-80 parts of white oil, carrying out melt extrusion, biaxial stretching, white oil extraction and heat setting, and rolling to obtain the high-flame-retardant high-thermal-conductivity lithium battery diaphragm. The compositeflame-retardant system and the high-thermal-conductivity inorganic filler are added into the lithium battery diaphragm to form a flame-retardant network and a thermal-conducting network which are in bridge connection, so that the flame retardancy and the thermal conductivity of the diaphragm are improved, and the safety problem of a lithium battery is solved from two aspects of thermal conductionand flame retardancy.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragms, in particular to a lithium battery diaphragm with high flame resistance and high thermal conductivity and a preparation method thereof. Background technique [0002] According to the roadmap of lithium-ion batteries for EVs, the energy density of lithium-ion batteries will reach 300Wh kg by 2020 -1 Above, the battery pack level reaches 200Wh·kg -1 , which shows that the battery life 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 very 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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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 JIANGSU HORIZON NEW ENERGY TECH CO LTD