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Lithium-ion membrane and the application thereof

A technology for lithium-ion batteries and diaphragms, which is used in diaphragms. The diaphragm is applied with a polymer matrix and contains evenly dispersed inorganic fillers. It can solve the problems of poor processability and poor safety, and achieve excellent performance and good safety performance. , good reproducibility

Inactive Publication Date: 2009-10-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of poor safety of the existing separators and at the same time overcome the disadvantages of poor processability caused by adding a layer of porous inorganic electrical insulating coating to the separators, the present invention provides a separator with good processability and safety performance. diaphragm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The matrix of the diaphragm is polyethylene, and the filler is alumina ceramic particles. The weight ratio of alumina ceramic particles (relative to the polymer matrix) is 5wt.%. The separator has an average pore size of 100nm, a porosity of 60%, and a thickness of 25 microns. Other conditions are the same as in Comparative Example 1 or 2, and a lithium-ion battery with a production capacity of 20Ah is produced. After testing, the battery whose internal resistance deviation exceeds the average value by 10% is 0%.

[0022] Safety test: the lithium-ion battery was placed in an oven at 120°C for 6 hours, the battery obviously swelled, and no fire or combustion occurred after 12 hours.

Embodiment 2

[0024] The matrix of the diaphragm is a blend film of polyethylene and polypropylene, and the filler is zirconia ceramic particles. The weight ratio of zirconia ceramic particles (relative to the polymer matrix) is 12 wt.%. The separator has an average pore diameter of 20nm, a porosity of 30%, and a thickness of 35 microns. Other conditions are the same as in Example 1, and a lithium-ion battery with a production capacity of 20Ah is produced. After testing, the battery whose internal resistance deviation exceeds the average value by 10% is 0%.

[0025] Safety test: the lithium-ion battery was placed in an oven at 120°C for 6 hours, the battery obviously swelled, and no fire or combustion occurred after 12 hours.

Embodiment 3

[0027] The matrix of the diaphragm is nylon 66 film, the filler is hollow silicon oxide ceramic particles, and the weight ratio of the hollow silicon oxide ceramic particles (relative to the polymer matrix) is 1wt.%. The separator has an average pore diameter of 500nm, a porosity of 80%, and a thickness of 100 microns. Other conditions are the same as in Example 1, and a lithium-ion battery with a production capacity of 20Ah is produced. After testing, the battery whose internal resistance deviation exceeds the average value by 10% is 0%.

[0028] Safety test: the lithium-ion battery was placed in an oven at 150°C for 6 hours, the battery obviously swelled, and no fire or combustion occurred after 12 hours.

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Abstract

The invention belongs to the field of battery technology, in particular to a lithium-ion battery membrane and the application thereof. The membrane uses polymer as a matrix and comprises uniformly dispersed and flame-resistant inorganic filler, wherein the polymer is a freeradical polymer or a linear condensation polymer, the inorganic filler is alumina, zirconia, silicon oxide and the like. The membrane has good safety performance and high mechanical strength and can prevent gas bulging, combustion and explosion. Compared with other methods, the invention has strong operability, lower cost, good reproducibility, and stable quality and high volume, capacity and density of obtained products, and can be used for lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a separator, more specifically, the invention relates to a separator containing uniformly dispersed inorganic fillers and a polymer matrix. The invention also relates to the use of the membrane. [0002] The separator overcomes the disadvantages of poor safety of the existing separators, and at the same time overcomes the disadvantages of poor processability caused by coating a layer of ceramic particles on the surface of the separator, and has good safety performance, processing performance and electrochemical performance. Safety performance of separators and their applications in lithium-ion batteries. The invention has strong operability and good reproducibility, and the obtained product has stable quality and excellent performance. Background technique [0003] As we all know, lithium-ion batteries (including polymer lithium-ion batteries using polymer electrolytes) have th...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/36H01M10/40H01M50/417H01M50/446H01M50/491
CPCY02E60/122Y02E60/10
Inventor 张鹏杨黎春李琳琳吴宇平
Owner FUDAN UNIV
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