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Skeleton and gel matrix-integrated active membrane of lithium-ion battery and preparation method of skeleton and gel matrix-integrated active membrane

A lithium-ion battery, gel matrix technology, applied in battery pack parts, separators/films/diaphragms/spacers, circuits, etc., can solve problems such as battery safety hazards, improve temperature resistance, enhance protection Liquid performance, increase the effect of enrichment

Active Publication Date: 2017-12-05
XUCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be pointed out that this kind of "active porous diaphragm" has excellent properties such as higher liquid absorption rate, liquid retention rate and electrical conductivity than traditional porous diaphragms, but its active components are mainly enriched on the surface of the membrane or membrane pores. The PEO or PEG segment of the membrane is concentrated, and after the membrane is activated by soaking in the electrolyte, there is inevitably a flowing liquid electrolyte in the pores, which is still a safety hazard during the use of the battery.

Method used

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  • Skeleton and gel matrix-integrated active membrane of lithium-ion battery and preparation method of skeleton and gel matrix-integrated active membrane
  • Skeleton and gel matrix-integrated active membrane of lithium-ion battery and preparation method of skeleton and gel matrix-integrated active membrane
  • Skeleton and gel matrix-integrated active membrane of lithium-ion battery and preparation method of skeleton and gel matrix-integrated active membrane

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preparation example Construction

[0032] A method for preparing an active diaphragm for a lithium-ion battery integrating a skeleton and a gel matrix, comprising the steps of:

[0033] 1) The linear polymer PVDF or PVDF-HFP with a mass percentage of 8-25%, the amphiphilic polymer with a hydrophilic chain end of vinyl group at the end of a hydrophilic chain with a mass percentage of 5-15%, and the mass percentage Mix 0.1-10% additives and 60-85% solvent at 45-60°C to make a casting solution; scrape the film-making solution on a stainless steel carrier or a glass carrier to a thickness of 80-200 microns liquid film, and immerse in a coagulation bath at 0-60°C to solidify into a precursor skeleton;

[0034] 2) A monomer or oligomer containing 1-20% by mass of unsaturated double bonds, a thermal initiator with a mass percentage of 0.01-3% and a thermal initiator with a mass percentage of 75-90% The solvent is prepared into a solution; soak the skeleton prepared in step 1) in the solution for 0.5-2 hours, take it ...

Embodiment 1

[0046] 1) The polymer PVDF with a mass percentage of 20%, the amphiphilic polymer with a vinyl end at the end of a hydrophilic chain with a mass percentage of 5%, the additive PEG2000 with a mass percentage of 2%, and the mass percentage The solvent N, N-dimethylacetamide with a content of 73% is mixed at 60°C to make a casting solution; the film-making solution is scraped into a liquid film with a thickness of 30 microns on a stainless steel carrier or a glass carrier, and immersed in 40°C solidified into a precursor skeleton in a coagulation bath;

[0047] 2) The monomer divinyl-1,4-butanediol ether (mass percentage is 10%), thermal initiator azobisisobutyronitrile (mass percentage is 0.02%) and solvent acetone (mass percentage The percentage content is 90%) to prepare a solution; soak the skeleton prepared in step (1) in the solution for 1 h, take it out, put it into a sealable glass mold, thermally polymerize at 65°C for 5 h, wash and dry After that, the lithium ion batte...

Embodiment 2

[0049] 1) The polymer PVDF-HFP with a mass percentage of 20%, the amphiphilic polymer with a vinyl end at the end of a hydrophilic chain with a mass percentage of 8%, and the additive polyethylene with a mass percentage of 2% Pyrrolidone and 70% by mass solvent N, N-dimethylformamide are mixed at 70°C to make a casting solution; the film-making solution is scraped on a stainless steel carrier or a glass carrier to form a liquid film with a thickness of 40 microns , and immersed in a coagulation bath at 30°C to solidify into a precursor skeleton;

[0050] 2) The monomer methyl methacrylate (8% by mass), the thermal initiator azobisisobutyronitrile (0.02% by mass) and the solvent acetone (92% by mass) Prepare a solution; soak the skeleton prepared in step (1) in the solution for 1 h, take it out, put it into a sealable glass mold, thermally polymerize at 65°C for 4 h, wash and dry to get the skeleton and gel Gel-matrix-integrated active separators for lithium-ion batteries, suc...

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Abstract

The invention discloses a skeleton and gel matrix-integrated active membrane of a lithium-ion battery and a preparation method of the skeleton and gel matrix-integrated active membrane. A skeleton is a porous membrane prepared from a linear polymer PVDF or PVDF-HFP as a first ingredient and a linear, comb-like or hyperbranched amphiphilic polymer of vinyl at the end of a hydrophilic chain as a second ingredient; the aperture of the membrane is 0.05-1.0micron and the thickness of the membrane is 20-80 microns; and the formula composition of a gel matrix comprises a monomer or oligomer containing unsaturated double bonds, a thermal initiator and a solvent. By adopting a phase inversion method in the membrane preparation process, the obtained membrane is high in porosity, efficient and controllable within a relatively wide aperture range and narrow in aperture distribution, and the fluid retention property is relatively well strengthened. The controllability of the membrane structure is good and the production repeatability is good; the wettability of an electrolyte is improved, and an electrode and a membrane resistor in the battery are reduced; and the temperature tolerance of the battery is improved, the battery does not explode or combust at relatively high temperature, and the skeleton and gel matrix-integrated active membrane is especially suitable for a power lithium-ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion battery diaphragm materials, in particular to a gel electrolyte active diaphragm in a power battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of secondary rechargeable battery. Compared with the currently used alkaline / manganese battery, lead / acid battery and nickel / hydrogen battery, lithium-ion battery has high open circuit voltage, high specific capacity, long cycle life, It has the advantages of good safety, environmental friendliness, low self-discharge rate, and no memory effect. In the liquid lithium-ion battery, the separator is an important part. Its main function is to separate the positive and negative electrodes of the battery to prevent the short circuit from direct contact between the two electrodes. Its microporous structure maintains the necessary electrolyte and forms a channel for ion movement. Realize the function of allowing ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/426H01M50/491
CPCH01M50/403H01M50/409H01M50/411Y02E60/10
Inventor 李浩钞春英韩培林张洪浩
Owner XUCHANG UNIV
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