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Lithium ion battery diaphragm and preparation method

A lithium-ion battery and diaphragm technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of high closed-cell temperature of the diaphragm, high thermal shrinkage at high temperature, and low film-breaking temperature, and reduce the closed-cell temperature. , The effect of high temperature thermal shrinkage is small, and the effect of increasing the film breaking temperature

Active Publication Date: 2014-09-03
FOSHAN YINGBOLAI TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the unsatisfactory technical problems of the existing lithium-ion battery separators, such as high closed cell temperature, low membrane rupture temperature, large high temperature thermal shrinkage rate and low liquid absorption rate, the primary purpose of the present invention is to provide a low closed cell temperature, membrane rupture Lithium-ion battery separator with better performance such as high temperature, low heat shrinkage rate at high temperature and high liquid absorption rate

Method used

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  • Lithium ion battery diaphragm and preparation method

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Embodiment 1~3 and Embodiment 10

[0027] The diaphragm base material is 20um dry-process PP film produced by Foshan Yingbolai Technology Co., Ltd., with an air permeability of 365.2s / 100ml and a heat shrinkage rate of 24.5% at 150°C / 1h;

[0028] Polyolefin: choose ethylene-propylene copolymer that can close the pores at 105°C;

[0029] Nano-ceramic material: Aluminum oxide is selected.

Embodiment 4~6

[0031] Diaphragm base material: 16um dry-process PP film produced by American Celgard Company is selected, its air permeability is 230.6s / 100ml, and the heat shrinkage rate at 150℃ / 1h is 21.0%;

[0032] Polyolefin: choose cross-linked polyethylene that can close the pores at 110°C;

[0033] Nano-ceramic material: choose zirconia.

Embodiment 7~9

[0035] Diaphragm base material: use 25um dry-process PP film produced by Xinxiang Zhongke Technology Co., Ltd., with an air permeability of 428.2s / 100ml and a heat shrinkage rate of 28.5% at 150°C / 1h;

[0036] Polyolefin: select random copolymerized polypropylene which can close the pores at 140°C;

[0037] Nano-ceramic material: choose titanium dioxide.

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Abstract

The invention discloses a lithium ion battery diaphragm and a preparation method thereof. The ion battery diaphragm comprises a diaphragm base material, wherein the surface of the diaphragm base material is coated with a polyolefin coating, and the coating thickness of the polyolefin coating is 1 to 4 micrometers. The diaphragm base material is coated with the polyolefin coating, and an effect for reducing the obturator temperature can be realized, so that the worsening of a thermal runaway can be prevented, when the temperature in a lithium ion battery reaches the obturator temperature, current can be disconnected at the first time, an effect for protecting the lithium ion battery can be realized, the thermal shrinkage rate of the lithium ion battery diaphragm after being roasted for 1h under the temperature of 150DEG C is less than 5 percent; compared with a non-coated lithium ion battery diaphragm, for the lithium ion battery diaphragm disclosed by the invention, the liquid absorption addition rate is 10 to 28 percent, and the charging-discharging cycling efficiency of the lithium ion battery can be further improved.

Description

technical field [0001] The invention relates to a polymer material plastic film, in particular to a lithium ion battery diaphragm and a preparation method thereof. [0002] Background technique [0003] The closed cell temperature and membrane rupture temperature of the lithium-ion battery separator have an important impact on the safety of the battery. Generally speaking, a low closed cell temperature can prevent further aggravation of thermal runaway inside the battery, and a high membrane rupture temperature can prevent the diaphragm from melting at high temperatures. Or rupture and cause a large area short circuit. Therefore, the difference between membrane rupture temperature and closed cell temperature is an important index to measure the safety of the battery. Under the premise of not affecting other performances, the greater the difference, the higher the safety of the battery. The closed cell temperature and membrane rupture temperature of lithium-ion battery sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/417
CPCH01M50/403H01M50/411Y02E60/10
Inventor 周侨发
Owner FOSHAN YINGBOLAI TECH
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