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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 above-mentioned PEO matrix gel polymer electrolyte, such as figure 1 shown, including the following steps:

[0023] S1, adding fluoroalkylboride to LiPF 6 / EC+DMC lithium salt solution, ultrasonically dispersed to form a mixed solution; among them, LiPF 6 The molar ratio to fluoroalkylboride is 1:0.001~1:0.05;

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

[0025] The preparation method of the PEO matrix gel polymer electrolyte, in step S1, the LiPF 6 The molar ratio to fluoroalkylboride is 1:0.02~1:0.05.

[0026] The preparation method of the PEO matrix gel polymer electrolyte, in step S1, in step S1, the LiPF 6 The molar concentration of / EC+DMC lithium salt solution is 1mol / L; the volume ratio of EC to DMC is 1:2.

[0027] The preparation method of the PEO matrix gel polymer electrolyte, in step S1, in step S1, th...

Embodiment 1

[0032] In the glove box, the additive (C 6 h 3 F)O 2 B(C 6 h 3 f 2 ) ultrasonic (ultrasonic 30min) dispersed in 1mol / L LiPF 6 In the solution of / EC+DMC (the volume ratio of EC and DMC is 1:2; the volume numbers are 10 and 20ml respectively), a mixed solution is formed, wherein, LiPF 6 with (C 6 h 3 F)O 2 B(C 6 h 3 f 2 ) in a molar ratio of 1:0.05; then immerse the dried PEO microporous membrane in the above mixed solution, take it out after 60min, and obtain the added (C 6 h 3 F)O 2 B(C6H 3 f 2 ) PEO-based gel polymer electrolyte.

Embodiment 2

[0034] In the glove box, the additive (C 6 f 4 )O 2 B(C 6 f 5 ) ultrasonic (ultrasonic 25min) dispersed in 1mol / L LiPF 6 In the solution of / EC+DMC (the volume ratio of EC and DMC is 1:2; the volume numbers are 8 and 16ml respectively), a mixed solution is formed, wherein, LiPF 6 with (C 6 f 4 )O 2 B(C 6 f 5 ) in a molar ratio of 1:0.04; then immerse the dried PEO microporous membrane in the above mixed solution, take it out after 40min, and obtain the added (C 6 f 4 )O 2 B(C 6 f 5 ) of PEO matrix gel polymer electrolyte.

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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 LiPF6 / EC+DMC lithium salt and a fluoroalkyl boride, wherein a mole ratio of LiPF6 to the fluoroalkyl boride is 1: 0.001 to 1: 0.05. The fluoroalkyl boride of the PEO-based gel polymer electrolyte can form a coordination compound with PF6<-> so that a LiPF6 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 合物电解 Quality and 其制 preparation 法 . Background technique [0002] Safety issues are the bottleneck restricting the application of high-capacity and high-power lithium-ion batteries. The main safety hazards of batteries are the combustion and explosion caused by leakage of liquid electrolyte, electrolyte oxidation decomposition and thermal runaway, which are widely used at present. Gel polymer electrolyte lithium-ion batteries have been valued by researchers because of their safety, no leakage, and low leakage current. And the gel polymer electrolyte is a new type of functional polymer material, which can be used as a diaphragm and an electrolyte material at the same time, which can make the battery thinner, thereby improving the flexibility of battery design. [0003] PEO has the advantages of easy processing and good thermoplasticity of solid electrolyte...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCY02E60/10
Inventor 周明杰邓惠仁王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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