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Colloidal polymer electrolyte for lithium ion cell and its preparing method

A technology of colloidal polymers and electrolytes, applied in secondary battery components, etc., can solve problems such as high ionic conductivity, affecting battery performance, and low ionic conductivity

Inactive Publication Date: 2005-12-21
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the Japanese patent application JP 037 752A, a polymer electrolyte was prepared by mixing ethylene glycol and dimethacrylate and performing UV irradiation, but the ionic conductivity of the prepared colloidal polymer electrolyte was too low and the internal resistance was large. difficult to apply in practice
[0006] US 4 830 939A discloses a polymer electrolyte, which is prepared by mixing a polymerizable monomer containing one or more unsaturated functional groups with an electrolyte solution and curing with UV light. The ionic conductivity of the prepared polymer electrolyte is relatively high high, but less flexible
[0007] In US 5 952 126, a copolymer of N-isopropylacrylamide and polyethylene glycol dimethacrylate and an electrolyte are used to prepare a polymer electrolyte, and the manufacturing process is relatively complicated
[0008] Domestic patent CN 1317 512A discloses a method for preparing a gel-state lithium-ion polymer electrolyte material by thermochemical crosslinking under a thermal initiator using acrylate series derivatives as monomers. The method is to first inject the raw material into into the battery, and then heat the battery to cause a reaction. Although the process is simple, it will cause gas swelling and gas swelling, which will affect the performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 2

[0039] (1) Purify the polymerized monomer (containing active functional groups) to remove moisture and other impurities;

[0040] (2) dissolving each monomer in a solvent to obtain a monomer mixture, loading the monomer mixture into a reaction vessel, and adding an initiator;

[0041] (3) The oxygen in the reaction vessel is removed by introducing nitrogen, and the reaction is carried out at 65 to 90° C. for 6 to 10 hours in the presence of a thermal initiator to obtain a polymer matrix material; or in the presence of a room temperature initiator Place at room temperature for 12 to 72 hours, and polymer substrates can also be obtained after polymerization;

[0042] (4) Dissolve the matrix material in the electrolyte solution after vacuum drying, add a certain amount of cross-linking agent that matches the active functional group, and mix evenly;

[0043] (5) The mixed solution is directly injected into the battery, and after a period of time, a colloidal polymer electrolyte c...

Embodiment 1

[0048] Methyl methacrylate: 98 parts

[0049] Ethylene glycol diacrylate: 2 parts

[0050] Dibenzoyl peroxide: 0.8 parts

[0051] N,N-Dimethylaniline: 0.4 part

[0052] Electrolyte: 1MLiPF 6 , DMC:DEC:EC=1:1:1 (volume ratio), 400 parts

[0053] Take the purified methyl methacrylate, ethylene glycol diacrylate, and dibenzoyl peroxide, and place them in container A; take another electrolyte solution and N,N-dimethylaniline and place them in container B. After A and B are evenly mixed, the mixed solution is injected into the battery, and the reaction monomers will gradually polymerize under the initiation of the redox initiation system, and a colloidal polymer electrolyte can be formed in the battery after 24 to 48 hours.

Embodiment 2

[0055] Methyl methacrylate: 98.8 parts

[0056] Hydroxyethyl methacrylate: 1.2 parts

[0057] Dibenzoyl peroxide: 1 part

[0058] Isophorone diisocyanate: 0.6 part

[0059] Electrolyte: 1MLiPF 6 , DMC:DEC:EC=1:1:1 (volume ratio), 900 parts

[0060] Methyl methacrylate and hydroxyethyl methacrylate are purified to remove moisture and other impurities. The treated monomer is dissolved in the solvent and loaded into the reaction vessel, and thermal initiator-dibenzoyl peroxide is added, and 150 parts of ethyl acetate and toluene mixed solvent (volume ratio 9: 1) are added. The oxygen in the container is removed by nitrogen, and the polymer matrix material can be prepared by reacting at 75-80° C. for 8 hours under nitrogen atmosphere.

[0061] The matrix material is vacuum-dried and dissolved in the electrolyte, and the cross-linking agent IPDI is added, and the mixed solution is injected into the battery. After about 18 hours, a colloidal polymer electrolyte can be formed in...

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PUM

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Abstract

The colloidal polymer electrolyte system consists of acrylate monomer and its derivative 100 (in weight portions, the same below) including that with functional group 0.4-10; electrolyte liquid 300-1900; initiator 0.2-4 and crosslinking agent 0-5. One of preparation process incldues mixing the components, liquid state filling, polymerizing in the cell chamber to form colloidal polymer electrolyte. The other preparation process includes polymerizing acrylate monomer and its derivative, dissolving the polymer in electrolyte liquid, adding crosslinking agent to mix homogeneously, filling into cell chamber and crosslinking inside the cell chamber to form colloidal polymer electrolyte. The present invention is easy to operate and high in safety, and the prepared electrolyte has excellent comprehensive performance.

Description

Field of Invention [0001] The present invention relates to a colloidal polymer electrolyte for lithium ions, and more particularly, the present invention relates to a colloidal polymer electrolyte system that can be generated by polymerization or cross-linking in a battery, and a method for producing such a colloidal polymer electrolyte. technical background [0002] The polymer lithium-ion battery is a new type of lithium-ion battery developed on the basis of the liquid lithium-ion battery. Its advantages lie in its small size, light weight and thin thickness. possible. The polymer lithium-ion battery is a new direction in the development of lithium-ion technology and has broad application prospects, so it has attracted the attention of researchers and manufacturers. [0003] The core technology of polymer lithium-ion batteries is the preparation of high-performance polymer electrolytes. Polymer electrolytes are mainly divided into pure solid polymer electrolytes (without...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/08H01M10/02
CPCY02E60/10
Inventor 胡继文李小平李明威肖定书
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI