Separator comprising a porous layer and method for producing said separator

A separator and porous layer technology, applied in the field of separators, can solve the problems of resistance to mechanical force, shorten battery life, etc., and achieve the effects of enhanced safety, high electrochemical stability, and good mechanical properties

Active Publication Date: 2014-10-22
SIHL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These temperature-stable separators are often not resistant to mechanical forces, which shortens the life of the corresponding battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0090] 2.5 g of dodecylbenzenesulfonic acid was dissolved in 70 ml of toluene. Add 31.5g of boehmite pigment to this solution and stir for 2 hours, the grain size of boehmite is about 40nm, and the BET surface area is 100m 2 / g, Al 2 o 3 The content is 80%. The liquid was then dispersed using a ball mill mixer to obtain a colloidal dispersion with an average particle size of about 350 nm as determined by laser diffraction.

[0091]A binder solution comprising Kraton G1651EU, which is a linear SEBS triblock copolymer (styrene-ethylene / butylene-styrene), was prepared by heating the polymer under reflux in toluene at a concentration of 10 wt%. It has about 31.5% styrene as the end block (manufacturer: KRATON, molecular weight: about 240000, melt index at 230° C. / 5 kg < 1 g / 10 min).

[0092] 53.7 g of pigment dispersion was introduced first, then 26.3 g of binder solution was added by stirring to form a coating material with a solids content of approximately 25.2% and a pigmen...

example 2

[0100] 150 g of boehmite as in Example 1 was dried at 150° C. for 4 hours. The pre-dried pigment was suspended or pre-dispersed in 750 ml of anhydrous p-xylene using an ultrasonic homogenizer. This mixture was heated under reflux, and 110 g of phenylmethyl was added dropwise. The mixture was heated at reflux for 10 hours. After this time, 60 ml of ethanol were added and the reaction solution was concentrated on a rotary evaporator. Toluene was added twice and each time was distilled off on a rotary evaporator, and the material was dispersed by a ball mill mixer to obtain a colloidal dispersion with an average particle size of about 350 nm (laser diffraction).

[0101] This pigment dispersion is then mixed with the binder solution of Example 1, with stirring, to form a coating material with a solids content of about 13% and a pigment-binder ratio of 3.57:1 (equivalent to a pigment fraction of 78 %).

[0102] The coating material was temporarily supported using a laboratory ...

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Abstract

The invention relates to a separator for an electrochemical cell, preferably a lithium-ion battery, comprising a porous layer, which comprises at least one block copolymer having three or more polymer blocks and at least one aluminum oxide or aluminum hydroxide, to a lithium-ion battery having such a separator, and to a method for producing such a separator.

Description

technical field [0001] The present invention relates to a separator for use in electrochemical cells, especially lithium-ion cells, comprising a porous layer comprising at least one block copolymer having three or more polymer blocks and at least An aluminum oxide or hydroxide, the invention also relates to a lithium ion battery comprising such a separator, and a method of making such a separator. The microporous layer of the separator comprises at least one block copolymer as binder and an oxide or hydroxide of aluminum, such as boehmite, as main constituents. Separators based on this layer structure have remarkable properties of fast liquid absorption, high porosity, high mechanical strength, and extremely low shrinkage under thermal stress. The safety performance of today's conventional lithium-ion batteries thus has the potential to be substantially improved. Furthermore, such separators can also be produced on a commercial scale using inexpensive coating methods. Back...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/403H01M50/431H01M50/449H01M50/489H01M50/491
CPCH01M2/1686Y02E60/122H01M2/1646H01M2/1666H01M2/166H01M10/0525H01M50/449H01M50/431H01M50/446H01M50/491H01M50/489H01M50/403Y02E60/10C08K3/22C09D153/00C08K2003/2227
Inventor 克劳斯·古茨阿克塞尔·尼莫拉曼弗雷德·谢弗
Owner SIHL
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