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PEO-based gel polymer electrolyte and preparation method thereof

A gel polymer and electrolyte technology, applied in the field of electrolytes, can solve the problems of low conductivity and achieve the effects of improving conductivity, increasing the number of migration, and good safety performance

Inactive Publication Date: 2013-12-18
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] PEO has the advantages of easy processing and good thermoplasticity of solid electrolytes, but the conductivity of the PEO electrolyte system is very low. At 40-100°C, the electrolyte conductivity is only 10 -8 -10 -4 S / cm, which limits its application

Method used

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  • PEO-based gel polymer electrolyte and preparation method thereof

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preparation example Construction

[0022] The preparation method of the above-mentioned PEO matrix gel polymer electrolyte, such as figure 1 As shown, including the following steps:

[0023] S1. Add fluoroalkyl phosphite to CH 3 COOLi / EC+DMC lithium salt solution, ultrasonically dispersed to form a mixed solution; among them, CH 3 The molar ratio of COOLi to fluoroalkyl phosphite is 1:0.001~1:0.05;

[0024] S2. Immerse the dried PEO microporous membrane in the above-mentioned mixed solution, and take it out after 5-60 minutes to obtain a PEO matrix gel polymer electrolyte.

[0025] In the method for preparing the PEO matrix gel polymer electrolyte, in step S1, the CH 3 The molar ratio of COOLi to fluoroalkyl phosphite is 1:0.02~1:0.05.

[0026] In the method for preparing the PEO matrix gel polymer electrolyte, in step S1, in step S1, the CH 3 The molar concentration of COOLi / EC+DMC lithium salt solution is 1mol / L; the volume ratio of EC (ethyl carbonate) and DMC (dimethyl carbonate) is 1:2.

[0027] In the method for p...

Embodiment 1

[0032] In the glove box, disperse the additive tris(2,2,2-trifluoroethyl) phosphite into 1mol / L CH 3 COOLi / EC+DMC (the volume ratio of EC to DMC is 1:2; the volume number is 10 and 20ml respectively) to form a mixed solution, where CH 3 The molar ratio of COOLi to tris(2,2,2-trifluoroethyl) phosphite is 1:0.05; then the dried PEO microporous membrane is immersed in the above mixed solution, and after 60 minutes, it is taken out to obtain the added A PEO-based gel polymer electrolyte of three (2,2,2-trifluoroethyl) phosphite.

Embodiment 2

[0034] In the glove box, disperse the additive tris(3,3,3-trifluoropropyl) phosphite into 1mol / L CH 3 COOLi / EC+DMC (the volume ratio of EC to DMC is 1:2; the volume number is 8 and 16ml respectively) to form a mixed solution, where CH 3 The molar ratio of COOLi to tris(3,3,3-trifluoropropyl) phosphite is 1:0.04; then the dried PEO microporous membrane is immersed in the above mixed solution, and after 40 minutes, it is taken out to obtain the added A PEO matrix gel polymer electrolyte of tris(3,3,3-trifluoropropyl) phosphite.

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Abstract

The invention belongs to the field of electrolytes and discloses a PEO-based gel polymer electrolyte and a preparation method thereof. The PEO-based gel polymer electrolyte comprises a PEO matrix, a CH3COOLi / EC+DMC lithium salt and fluoroalkyl phosphite, wherein a mole ratio of CH3COOLi to fluoroalkyl phosphite is 1: 0.001 to 1: 0.05. The fluoroalkyl phosphite of the PEO-based gel polymer electrolyte can form a coordination compound with CH3COO<-> so that a CH3COO<-> dissociation degree is improved and lithium ion transport number is increased and thus conductivity is greatly improved. In a lithium ion battery, the PEO-based gel polymer electrolyte does not leak, has good safety and greatly improves conductivity.

Description

Technical field [0001] The invention relates to the field of electrolytes, in particular to a PEO matrix gel polymer electrolyte and a preparation method thereof. Background technique [0002] Safety issues are the bottleneck restricting the application of large-capacity, high-power lithium-ion batteries. The leakage caused by the widely used liquid electrolyte, the oxidation and decomposition of the electrolyte, and the combustion and explosion caused by thermal runaway are the main safety hazards of the battery. Gel polymer electrolyte lithium ion batteries are valued by researchers because of their safety, no leakage, and low leakage current. And gel polymer electrolyte is a new type of functional polymer material, which can be used as a separator and electrolyte material at the same time, which can make the battery thinner, thereby improving the flexibility of battery shape design. [0003] PEO has the advantages of easy processing of solid electrolyte and good thermoplastici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058
CPCY02E60/10Y02P70/50
Inventor 周明杰邓惠仁王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD