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Lithium ion battery composite separation membrane and preparation method thereof

A lithium-ion battery and composite diaphragm technology, which is applied in battery pack parts, circuits, electrical components, etc., can solve the problems of limited liquid absorption and liquid retention, limited application, poor electrolyte wetting ability, etc., and achieves a simple method. Effect

Active Publication Date: 2014-04-09
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, non-polar polyolefin separators have a hydrophobic surface and low surface energy, and have poor wetting ability to polar electrolytes, so the ability to absorb and retain liquid is limited, which also limits the use of polyolefin separators in high-performance batteries. application in

Method used

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  • Lithium ion battery composite separation membrane and preparation method thereof
  • Lithium ion battery composite separation membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The preparation method of lithium-ion battery composite diaphragm in the present embodiment is:

[0037] (1) Preparation of modified natural rubber latex: in parts by weight, add 50 parts of water and 1 part of OP-10 to natural rubber latex containing 100 parts of dry rubber, and then add 0.2 parts of grafted monomer methyl methacrylate Ester, 0.005 part of potassium persulfate, 0.005 part of sodium bisulfite, 0.01 part of dodecyl mercaptan and 0.01 part of sodium dodecylsulfonate, heat up under the protection of nitrogen, when the temperature rises to 80 ° C, keep warm for 30 minutes , and then evenly drop 0.8 parts of the remaining grafted monomers, and control the dropwise addition within 2 hours, then continue to react at 80°C for 3 hours, and cool to room temperature to obtain;

[0038] (2) In parts by weight, 5 parts of water and 5 parts of dimethylformamide were added to 100 parts of modified natural rubber latex, mixed evenly, coated on a polyethylene diaphragm,...

Embodiment 2

[0040] The preparation method of lithium-ion battery composite diaphragm in the present embodiment is:

[0041](1) Preparation of modified natural rubber latex: in parts by weight, add 50 parts of water and 3 parts of OP-10 to natural rubber latex containing 100 parts of dry rubber, then add 7.5 parts of grafted monomer maleic anhydride, 0.4 part of potassium persulfate, 0.1 part of sodium bisulfite, 0.1 part of octadecyl mercaptan and 0.1 part of sodium dodecyl sulfonate are heated up under the protection of nitrogen. Evenly add 22.5 parts of the remaining grafted monomers dropwise, and control the dropwise addition within 2 hours, then continue the reaction at 80°C for 3 hours, and cool to room temperature to obtain the product;

[0042] (2) In parts by weight, add 10 parts of water and 30 parts of absolute ethanol to 100 parts of modified natural rubber latex, mix well, coat on a polyethylene diaphragm, cure at room temperature, and dry at 30°C.

Embodiment 3

[0044] The preparation method of lithium-ion battery composite diaphragm in the present embodiment is:

[0045] (1) Preparation of modified natural rubber latex: in parts by weight, add 50 parts of water and 7 parts of Pingpingjiao to natural rubber latex containing 100 parts of dry rubber, then add 20 parts of grafted monomer vinyl acetate, 1 1 part of dibenzoyl peroxide, 0.5 part of dodecyl mercaptan and 0.3 part of octylphenol polyoxyethylene ether, the temperature is raised under the protection of nitrogen, when the temperature rises to 80 ° C, keep warm for 30 minutes, and then evenly add 40 parts The remaining grafted monomers are controlled to be added dropwise within 2 hours, and then continue to react at 80°C for 3 hours, and then cooled to room temperature to obtain the product;

[0046] (2) In parts by weight, 20 parts of water and 100 parts of acetone are added to 100 parts of modified natural rubber latex, mixed evenly, coated on a polyethylene diaphragm, and drie...

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Abstract

The present invention discloses a lithium ion battery composite separation membrane and a preparation method thereof, and belongs to the technical field of lithium ion batteries, wherein at least a surface of a polyolefin separation membrane is coated with a modified natural rubber polymer coating. According to the invention, the polyolefin separation membrane and the modified natural rubber are combined to form the composite separation membrane, such that mechanical properties of the natural rubber can be improved, and the original pore closing characteristic of the polyolefin separation membrane can be maintained and utilized so as to improve safety of the battery, enhance bonding force between the separation membrane and the positive electrode and bonding force between the separation membrane and the negative electrode, eliminate the interface effect, and improve cycle stability of the battery; and the inorganic nanoparticles are added to the modified natural rubber latex, such that the crystallinity of the polymer can be reduced to a certain extent, the mechanical strength of the separation membrane and the carrier concentration can be increased, the interface compatibility between the separation membrane and the lithium electrode can be effectively improved, and the interface is stable.

Description

technical field [0001] The invention specifically relates to a lithium-ion battery composite diaphragm and a preparation method of the composite diaphragm, belonging to the technical field of lithium-ion batteries. Background technique [0002] Due to the advantages of high voltage, high specific energy, long cycle life and no pollution to the environment, lithium-ion batteries have been widely researched and applied in recent years, and have become the main power source of various electronic products. Lithium-ion secondary batteries are generally composed of positive and negative electrodes, separators, electrolytes and casings. The separator is an important part of the battery, which has a unique characteristic of being non-conductive and allowing ions to pass through. The role of the separator in the lithium-ion battery is to separate the positive and negative electrodes to prevent short circuits, and at the same time to ensure that lithium ions can pass through freely, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/417H01M50/449H01M50/489
CPCH01M50/403H01M50/411Y02E60/10
Inventor 杨书廷尹艳红朱学海荆正军毛新欣曹朝霞岳红云
Owner HENAN NORMAL UNIV
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