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Polymer isolating membrane and lithium ion battery applying same

A technology of lithium-ion batteries and polymers, applied in battery electrodes, secondary batteries, battery pack components, etc., can solve the problems of not having ionic conductivity, mechanical strength and interface stability at the same time, and achieve good ion transmission performance And electrochemical stability, good stability, good pore structure and mechanical properties

Active Publication Date: 2010-09-22
SOUTH CHINA NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gel polymer electrolytes obtained according to the above prior art still cannot simultaneously possess ideal ionic conductivity, mechanical strength and interfacial stability.

Method used

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  • Polymer isolating membrane and lithium ion battery applying same
  • Polymer isolating membrane and lithium ion battery applying same
  • Polymer isolating membrane and lithium ion battery applying same

Examples

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Effect test

Embodiment 1

[0028] The polymer is synthesized by emulsion polymerization, wherein the mass ratio of the monomer methyl methacrylate, the monomer vinyl acetate, and the oligomer polyethylene glycol diacrylate is 9:1:2; at 25°C, the micron Grade inorganic particles of aluminum oxide are dissolved in acetone solvent, and the above polymer is added, wherein the mass ratio of aluminum oxide to polymer is 1:10; after complete dissolution, the porous substrate with higher mechanical strength- A layer of polypropylene microporous membrane is soaked in the solution containing the polymer coating, that is, a polymer isolation membrane doped with micron-sized inorganic particles aluminum oxide of a certain thickness is prepared.

Embodiment 2

[0030] The polymer is synthesized by emulsion polymerization, wherein the mass ratio of the monomer methyl methacrylate, the monomer vinyl acetate, and the oligomer polyethylene glycol diacrylate is 9:1:1; at 35°C, the nano After dissolving aluminum oxide of high-grade inorganic particles in acetone solvent, add the above polymer, wherein the mass ratio of aluminum oxide to polymer is 1:2; after complete dissolution, double-sided the solution containing polymer coating It is printed on the porous substrate with high mechanical strength-multilayer composite polyethylene and polypropylene microporous membrane, that is, a polymer isolation membrane doped with micron-sized inorganic particles aluminum oxide of a certain thickness is prepared.

Embodiment 3

[0032] The polymer is synthesized by emulsion polymerization, wherein the mass ratio of the monomer methyl methacrylate, the monomer vinyl acetate, and the oligomer polyethylene glycol dimethacrylate is 9:1:1; at 28°C, After dissolving nanoscale inorganic particle titanium dioxide in acetone solvent, add the above polymer, wherein the mass ratio of titanium dioxide to polymer is 1:1; after completely dissolving, spray the solution containing the polymer coating on both sides of the mechanical strength On the higher porous substrate-single-layer polyethylene microporous membrane, a polymer isolation membrane doped with nano-scale inorganic particles is prepared with a certain thickness.

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Abstract

The invention discloses a polymer isolating membrane, comprising: (a) a porous substrate and (b) a polymer coating arranged on the porous substrate; wherein the polymer in the polymer coating contains mixture of monomer methyl methacrylate, monomer vinyl acetate and low polymer polyethylene glycol diacrylate, or mixture of monomer methyl methacrylate, monomer vinyl acetate and low polymer polyethyleneglycol dimethacrylate or mixture of the two mixtures. The polymer isolating membrane of the invention has desired lithium interface stability, tensile strength and ionic conductivity, the ionic conductivity of gel polymer electrolyte obtained by virtue of the polymer isolating membrane of the invention can reach 3.02x10-3S / cm at room temperature, tensile strength is more than 15MPa, and lithium interface resistance is small and interface stability is good. Besides, the invention also discloses a lithium ion battery applying the polymer isolating membrane of the invention.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, in particular to a polymer isolation film and a lithium ion battery using the polymer isolation film. Background technique [0002] Since its inception in the 1990s, lithium-ion batteries have been widely used in video cameras, notebook computers, portable DVDs, digital cameras, etc. Mobile devices provide energy and are known as "green high-energy and environmentally friendly batteries". [0003] However, liquid lithium-ion batteries have great safety hazards: due to the use of flammable liquid organic solvents as the electrolyte, when the battery is abused or the electrolyte leaks, the battery will smoke, catch fire or even explode. [0004] In order to improve the safety performance of liquid lithium-ion batteries, a variety of solutions have been proposed in the prior art. Among them, the use of gel polymer electrolytes is the best way to solve the safety problems of lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M10/0525C09D151/08H01M4/38H01M4/485H01M4/58H01M10/056H01M50/414H01M50/446H01M50/449H01M50/451H01M50/497
CPCY02E60/122Y02E60/10
Inventor 廖友好付成华李伟善邓勇强许瑞
Owner SOUTH CHINA NORMAL UNIVERSITY
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