Aluminum oxide and barium sulfate composite membrane for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and composite diaphragms, applied in the field of aluminum oxide-barium sulfate composite diaphragms for lithium-ion batteries and its preparation, can solve the problems of poor thermal stability and large resistance of the diaphragm, and achieve low cost, simple preparation, and low shrinkage rate effect

Inactive Publication Date: 2015-12-16
ZHEJIANG XINGHAI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the defects of poor thermal stability and high resistance of existing

Method used

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  • Aluminum oxide and barium sulfate composite membrane for lithium ion battery and preparation method thereof

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Effect test

Embodiment 1

[0022] A kind of aluminum oxide-barium sulfate composite diaphragm for lithium ion battery, comprises base film and is coated on one side of base film successively and is the aluminum oxide slurry layer of thickness 1 μ m and the barium sulfate slurry layer that thickness is 8 μ m; Wherein aluminum oxide The slurry layer includes the following components in parts by weight: 100 parts of alumina powder of nanoscale particles, 3 parts of binder polyvinylidene fluoride, 0.2 parts of carboxylate surfactant, organic solvent N,N- 200 parts of dimethylformamide; wherein the barium sulfate slurry layer includes the following components in parts by weight: 100 parts of aluminum oxide powder of nanoscale particles, 3 parts of binder polytetrafluoroethylene, carboxylate surface 0.2 parts of active agent, 200 parts of organic solvent N,N-dimethylformamide, wherein the base film is 16 parts by weight of polyethylene.

[0023] The manufacture method of aluminum oxide-barium sulfate composit...

Embodiment 2

[0030] A kind of aluminum oxide-barium sulfate composite diaphragm for lithium-ion battery, comprises base film and is coated on the aluminum oxide slurry layer of thickness 8 μ m and the barium sulfate slurry layer of thickness 1 μ m that are coated on both sides of base film successively; Wherein aluminum oxide The slurry layer includes the following components in parts by weight: 100 parts of alumina powder of nanoscale particles, 10 parts of binder polyimide and polysulfone, 1 part of sulfonate surfactant, organic solvent 1000 parts of dimethylacetamide; wherein the barium sulfate slurry layer includes the following components in parts by weight: 100 parts of alumina powder of nanoscale particles, 10 parts of binder polyimide, phosphate ester salt type surface 1 part of active agent, 1000 parts of organic solvent butyrolactone, wherein the base film includes 30 parts by weight of polyethylene;

[0031] The manufacture method of aluminum oxide-barium sulfate composite separ...

Embodiment 3

[0038] A kind of aluminum oxide-barium sulfate composite diaphragm for lithium-ion battery, comprises base film and the aluminum oxide slurry layer that is 4 μ m in thickness and the barium sulfate slurry layer that thickness is 4 μ m and is coated on both sides of base film successively, wherein aluminum oxide The slurry layer includes the following components in parts by weight: 100 parts of alumina powder of nanoscale particles, 6 parts of binder acrylonitrile polymer, 0.6 part of amine salt type surfactant, 600 parts of organic solvent butyrolactone wherein the barium sulfate slurry layer includes the following components in parts by weight: 100 parts of alumina powder of nanoscale particles, 6 parts of binder polyvinylidene fluoride copolymer, 0.4 parts of phosphate ester salt type surfactant , 600 parts of butyrolactone, wherein the polyethylene of 24 parts by weight of the base film;

[0039] The manufacture method of aluminum oxide-barium sulfate composite separator fo...

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Abstract

The invention discloses an aluminum oxide and barium sulfate composite membrane for a lithium ion battery. The aluminum oxide and barium sulfate composite membrane for the lithium ion battery comprises a basement membrane and coatings coated on the single side or double sides of the basement membrane, and the coatings comprise an aluminum oxide slurry layer and a barium sulfate slurry layer in sequence; the aluminum oxide slurry layer is prepared from, by weight, 100 parts of aluminum oxide powder with nanometer particles, 3-10 parts of binders, 0.2-1 part of surfactant and 200-1000 parts of solvent; the barium sulfate slurry layer is prepared from, by weight, 100 parts of barium sulfate powder with nanometer particles, 3-10 parts of binders, 0.2-1 part of surfactant and 200-1000 parts of solvent. According to the aluminum oxide and barium sulfate composite membrane for the lithium ion battery, a double-coating method is adopted initiatively to prepare the ceramic composite membrane, the aluminum oxide and barium sulfate composite membrane for the lithium ion battery is suitable for being used in high or low temperature environment with the temperature ranging from -20 DEG C to 80 DEG C, the outstanding performance in the solution preserving property and safety aspects is achieved, the manufacturing cost is moderate, and the aluminum oxide and barium sulfate composite membrane for the lithium ion battery is very suitable for being used in power batteries of new energy vehicles, and the great market value is achieved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an aluminum oxide-barium sulfate composite separator for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used as power sources for various mobile devices due to their high energy density, high operating voltage, no memory effect, and long cycle life. A lithium-ion battery usually includes a positive electrode, a negative electrode, a separator, and an electrolyte. As a barrier between the positive and negative electrodes, the separator plays a vital role in the performance of the lithium-ion battery. Its performance determines the interface structure and internal resistance of the battery. It directly affects the capacity, cycle performance and safety performance of the battery. The separator with excellent performance plays an important role in improving the overall performance of the battery. It is calle...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/431H01M50/457
CPCH01M2220/20H01M50/409H01M50/403Y02E60/10
Inventor 吴晓潭周培成徐云闻昱李飞
Owner ZHEJIANG XINGHAI ENERGY TECH
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