Gel state polymer lithium ion battery electrolyte and preparation method thereof

A lithium-ion battery and gel polymer technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as low conductivity, difficult industrialization, and complicated preparation process, and achieve strong mechanical strength and good cross-linking Excellent microporous structure and high electrochemical stability

Inactive Publication Date: 2011-11-16
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there are still some defects in the polyvinylidene fluoride matrix: ① The conductivity at room temperature is low, and there is still a certain gap from the level of liquid electrolyte; ② The mechanical strength needs

Method used

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  • Gel state polymer lithium ion battery electrolyte and preparation method thereof
  • Gel state polymer lithium ion battery electrolyte and preparation method thereof
  • Gel state polymer lithium ion battery electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Dissolve PVDF-HFP in DMF at a mass percentage of 10%, and heat and stir in a water bath at 40°C for 3 hours.

[0041] (2) After completely dissolving, pour the coating solution on a glass plate, scrape it flat with a scraper, let it stand for 1 minute, then transfer it to tap water at room temperature, soak it in water for 10 minutes, and then transfer the polymer film to room temperature. deionized water and removed after 6 hours. Naturally air-dried, that is, a self-supporting lithium-ion battery gel polymer film with a certain thickness is prepared.

[0042] (3) Place the prepared film in a vacuum drying oven at 80°C for 6 hours in vacuum, take it out, cut the polymer film into an appropriate size, and quickly transfer it to a glove box. After the polymer membrane was soaked in the electrolyte for 1 hour, a self-supporting gel polymer electrolyte for lithium-ion batteries was obtained. The electrolyte is: LiPF6 is dissolved in an ester mixture, and the ester mi...

Embodiment 3

[0048] (1) Dissolve PVDF-HFP in acetone at a mass percentage of 10%, and ball-mill the medium-alkali glass fiber with a diameter of 0.7 μm and a length of 4 μm (the model is valve-controlled Glass fibers for lead-acid batteries (purchased from Puyang Taixin Glass Fiber Products Co., Ltd.) were added to the solution, heated and stirred in a water bath at 60°C for 4 hours.

[0049] (2) After completely dissolving, pour the coating solution on a glass plate, scrape it flat with a scraper, let it stand for 30 minutes, then transfer it to tap water at 50°C, soak it in water for 1 hour, and transfer the polymer film to In deionized water at room temperature, take it out after 2 hours. Naturally air-dried to obtain a self-supporting lithium-ion battery gel polymer film doped with modified glass fibers with a certain thickness.

[0050] (3) Place the prepared film in a vacuum drying oven at 70°C for 10 hours in vacuum, take it out, cut the polymer film into an appropriate size, and q...

Embodiment 4

[0052] Liquid absorption, conductivity, porosity, decomposition temperature and scanning electron microscope tests were carried out on the above-mentioned lithium ion battery gel polymer electrolyte obtained by the method of embodiment 2 or 3, and the glass added in the lithium ion battery gel polymer electrolyte The amount of fiber was 5%, 10%, 15%, 20%, 30%, respectively.

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Abstract

The invention belongs to lithium ion battery field, and relates to gel state polymer lithium ion battery electrolyte and a preparation method thereof. The electrolyte is polyvinylidene fluoride gel electrolyte which is added with a modified glass fibre. Through blending P(VDF-HFP) with ball milled modified glass fibre, selfsupporting polymer membrane with excellent mechanics performance is obtained. Since the modified glass fibre has a certain amount of nanoparticles and the glass fibre constructs a strong support network, the polymer has an extremely good crosslinking micropore structure, extremely good imbibition performance and strong mechanical strength. The polymer is immersed in gel polymer electrolyte formed in electrolyte. After being assembled into a battery, an electrochemical test shows that the gel polymer electrolyte has good ion transmission performance, good electrochemical stabilization performance and high ion conductivity, and can be used as electrolyte of a polymer ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a self-supporting lithium ion battery gel polymer electrolyte doped with modified glass fibers and a preparation method thereof. Background technique [0002] The gel polymer electrolyte was first reported in 1975, using PAN and VDF-HFP cross-linked copolymers with PC and electrolyte salt NH 4 ClO 4 Preparation of physically cross-linked and chemically cross-linked gels. However, the research on gel polymer electrolytes did not develop rapidly until after the birth of lithium-ion batteries. [0003] In the gel polymer electrolyte, ionic conduction mainly occurs in the liquid phase plasticizer. Although there is an interaction between the polymer matrix and lithium ions, it is relatively weak, and the contribution to the ionic conduction is small, mainly providing good mechanical properties. There are many kinds of polymers, so there are many kinds of gel polymer electroly...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCY02E60/12Y02E60/10
Inventor 陈红雨陈潜莫名月
Owner SOUTH CHINA NORMAL UNIVERSITY
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