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Functional polymer, polymer electrolyte for lithium battery and preparation method, polymer electrolyte membrane, lithium ion battery

A polymer and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of difficult adjustment, low PEO content, low ionic conductivity at room temperature, etc., and achieve the effects of good mechanical strength, good molding processability, and excellent electrochemical performance.

Active Publication Date: 2021-04-06
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Predecessors have also done a lot of research in this area: For example, the solid electrolyte substrate selected in patents CN103208651A and CN103421190A is a comb-shaped siloxane-based polymer, but this kind of solid electrolyte is difficult to adjust because of its low PEO content. rates below 10 -4 S / cm

Method used

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  • Functional polymer, polymer electrolyte for lithium battery and preparation method, polymer electrolyte membrane, lithium ion battery
  • Functional polymer, polymer electrolyte for lithium battery and preparation method, polymer electrolyte membrane, lithium ion battery
  • Functional polymer, polymer electrolyte for lithium battery and preparation method, polymer electrolyte membrane, lithium ion battery

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Embodiment 1

[0068] In this embodiment, the functional polymer is composed of many polymer chains, and the polymer chains in the functional polymer are cross-linked with each other to form a functional polymer with a three-dimensional network cross-link structure.

[0069] The functional polymer in this embodiment includes a polymer chain composed of structural units shown in formula 1, and a membrane support group is connected between the two polymer chains. Specifically, one end of the membrane support group is connected to a polymer chain The No. 1 or No. 2 position on a structural unit in the chain, and the other end is connected to the No. 1 or No. 2 position on a structural unit of another polymer chain. Among the structural units that are not connected to the membrane support group on the polymer chain, a lithium ion conductive group is connected to the No. 1 position of the structural unit of a part of the polymer chain, and the No. 2 position of the structural unit of the other par...

Embodiment 2

[0086] In this embodiment, the functional polymer is composed of many polymer chains, and the polymer chains in the functional polymer are cross-linked with each other to form a functional polymer with a three-dimensional network cross-link structure.

[0087] The functional polymer in this embodiment includes a polymer chain composed of structural units shown in formula 1, and a membrane support group is connected between the two polymer chains. Specifically, one end of the membrane support group is connected to a polymer chain The No. 1 or No. 2 position on a structural unit in the chain, and the other end is connected to the No. 1 or No. 2 position on a structural unit of another polymer chain. Among the structural units that are not connected to the membrane support group on the polymer chain, a lithium ion conductive group is connected to the No. 1 position of the structural unit of a part of the polymer chain, and the No. 2 position of the structural unit of the other par...

Embodiment 3

[0104] In this embodiment, the functional polymer is composed of many polymer chains, and the polymer chains in the functional polymer are cross-linked with each other to form a functional polymer with a three-dimensional network cross-link structure.

[0105] The functional polymer in this embodiment includes a polymer chain composed of structural units shown in formula 1, and a membrane support group is connected between the two polymer chains. Specifically, one end of the membrane support group is connected to a polymer chain The No. 1 or No. 2 position on a structural unit in the chain, and the other end is connected to the No. 1 or No. 2 position on a structural unit of another polymer chain. Among the structural units that are not connected to the membrane support group on the polymer chain, a lithium ion conductive group is connected to the No. 1 position of the structural unit of a part of the polymer chain, and the No. 2 position of the structural unit of the other par...

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Abstract

The invention relates to a functional polymer, a polymer electrolyte for a lithium battery, a preparation method, a polymer electrolyte membrane and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The functional polymer of the present invention includes a polymer chain composed of structural units, a membrane support group is connected between the two polymer chains, and the two ends of the membrane support group are respectively connected to the No. 1 or No. 2 positions of the corresponding structural units ; The No. 1 or No. 2 position of the polymer chain structural unit is connected with a lithium ion conductive group; the lithium ion conductive group and the membrane support group are respectively connected to the No. 1 or No. 2 position of the independent structural unit; The molar ratio of lithium ion conducting groups to membrane supporting groups is 1: (1-2); the number of lithium ion conducting groups is 30-300. The membrane supporting group in the present invention enables the functional polymer to have good mechanical properties. The polymer electrolyte for lithium batteries of the invention has the advantages of high room temperature conductivity and strong mechanical strength.

Description

technical field [0001] The invention relates to a functional polymer, a polymer electrolyte for a lithium battery, a preparation method, a polymer electrolyte membrane and a lithium ion battery, and belongs to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion battery products currently on the market mainly use carbonate-based electrolytes, which are matched with microporous separators to achieve reversible movement of lithium ions between the positive and negative electrodes. However, due to the characteristics of the electrolyte itself, lithium-ion batteries face two major problems. On the one hand, problems such as easy leakage of liquid, low flash point, flammability, volatility, and toxicity are the main reasons for safety problems such as lithium-ion batteries burning or even exploding, which not only endangers personal safety, but also increases the investment risk of battery companies. . On the other hand, it is necessary to use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00H01M10/0565H01M10/0525
CPCC08G81/00H01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 王永勤侯红军薛旭金刘海霞薛峰峰王建萍李洁郭贤慧罗传军杨明霞
Owner DO FLUORIDE CHEM CO LTD
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