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Composite electrolyte diaphragm, preparation method thereof and battery

A composite electrolyte and electrolyte technology, applied in the field of composite electrolyte separator and its preparation, can solve the problems of increasing the manufacturing cost and manufacturing process of the separator, and achieve the effects of improving liquid absorption rate and wettability, improving safety performance, and increasing porosity.

Active Publication Date: 2020-11-10
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this further increases the diaphragm manufacturing cost and manufacturing process

Method used

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  • Composite electrolyte diaphragm, preparation method thereof and battery
  • Composite electrolyte diaphragm, preparation method thereof and battery
  • Composite electrolyte diaphragm, preparation method thereof and battery

Examples

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Effect test

Embodiment 1

[0050] Premix 2g polyethylene oxide and 2g lithium hexafluorophosphate at 10000rpm, pulse mixing, mix for 1min, stop for 0.2min, add 6g polytetrafluoroethylene after mixing for 5min, perform high-speed shear stirring at 20000rpm, pulse Formula mixing, mixing for 1 min, resting for 1 min, and after mixing for 10 min, the mixed powder was hot-rolled at 120°C to form a film to obtain an electrolyte membrane with a thickness of 60 um.

[0051] The optical photograph of described electrolyte membrane sees figure 1 and figure 2 .

Embodiment 2

[0053] Premix 1g of polyvinylidene fluoride-hexafluoropropylene copolymer and 2g of lithium hexafluorophosphate under the condition of 10000rpm, pulse mixing, mix for 2min, stop for 0.5min, add 7g of polytetrafluoroethylene after mixing for 5min, at 20000rpm Perform high-speed shear stirring, pulse mixing, mix for 5 minutes, stop for 1 minute, and after mixing for 15 minutes, heat the mixed powder to form a film at 150°C to obtain an electrolyte membrane with a thickness of 30um.

Embodiment 3

[0055] Premix 2g of polyvinylidene fluoride-hexafluoropropylene copolymer and 2g of lithium bistrifluoromethanesulfonate imide under the condition of 10000rpm, pulse mixing, mix for 2min, stop for 1min, mix for 5min, then add 6g poly Tetrafluoroethylene, under the condition of 20000rpm, high-speed shear stirring, pulse mixing, mixing for 1min, resting for 1min, after mixing for 10min, the mixed powder was hot-rolled at 150°C to form a film to obtain an electrolyte membrane with a thickness of 50um .

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Abstract

The invention discloses a composite electrolyte diaphragm, a preparation method thereof and a battery, and the method comprises the following steps: 1) taking fiberable polymer powder and lithium saltas a material main body, shearing and mixing at a high speed which is greater than or equal to 1000 rpm to obtain a mixture; 2) carrying out hot-pressing treatment on the mixture to a preset thickness to obtain the electrolyte membrane. The composite electrolyte membrane is prepared by adopting a dry method, the obtained fibrous polymer is used as a composite electrolyte membrane support body, the composite electrolyte membrane has the advantages of good thermal stability, good chemical stability and high strength, the heat resistance of the membrane can be effectively improved, and the puncture strength and the tensile strength are enhanced, so the safety performance of a battery at high temperature is improved, and the ability to block lithium dendrites is improved. The added lithium salt can be used as a pore-forming agent, and a part of the lithium salt can be dissolved in an electrolyte, so the porosity of the diaphragm is improved, and the liquid absorption rate and wettabilityof the diaphragm are improved.

Description

technical field [0001] The invention relates to the technical field of batteries, and relates to a composite electrolyte diaphragm, a preparation method thereof and a battery. Background technique [0002] With the rapid development of new energy vehicles, the requirements for energy density and safety performance of vehicle energy storage devices are constantly increasing. Lithium-ion batteries, which have the advantages of high specific energy, high specific power, good cycle performance, and no environmental pollution, are considered to be the best choice. It is estimated that by 2025, the energy density of power batteries will reach more than 500Wh / kg. With the continuous improvement of power battery energy density, its safety performance is also facing more severe tests. In addition, in recent years, a large number of electronic products have been popularized. Lithium batteries as their power sources have attracted more and more attention because of their advantages s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/0565
CPCH01M10/0525H01M10/0565H01M2300/0088H01M2300/0082Y02E60/10
Inventor 马忠龙郑晓醒秦士林赵晓宁蔡挺威
Owner SVOLT ENERGY TECHNOLOGY CO LTD