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Composite solid electrolyte and preparation method and application thereof

A solid electrolyte, quality technology, applied in the direction of non-aqueous electrolyte batteries, circuits, electrical components, etc., can solve the problems of cumbersome solid electrolyte production process, insufficient lithium ion conductivity, long cycle, etc., to reduce low interface impedance, Excellent discharge performance and short production cycle

Pending Publication Date: 2022-04-01
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the above solutions of composite solid electrolytes, the conductivity of lithium ions is not high enough, there is still room for improvement, and the production process of solid electrolytes is cumbersome and the cycle is long.

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  • Composite solid electrolyte and preparation method and application thereof

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preparation example Construction

[0025] The invention proposes a method for preparing a composite solid electrolyte, which includes: mixing fluorine-containing polymers, lithium salts, nano-ceramic materials, organic alkali metal compounds, and organic solvents in a mass ratio of 100:1 to 200:1 to 100:0.001 to 10: 100-10000, perform high-energy dispersion treatment at a rate of 500-50000rpm, apply the slurry after high-energy dispersion treatment to form a film, and vacuum dry at 60-100°C for 12-72 hours to form a composite solid electrolyte.

[0026] Among them, the organoalkali metal compound is preferably organic alkali metal lithium; during the high-energy dispersion process, the C-F bond of the fluoropolymer is removed from the -F under the catalysis of the organoalkali metal lithium to form a localized double bond rich in π electrons Structured polymer and nano-lithium fluoride, in-situ modification of the surface layer of nano-ceramic materials by nano-lithium fluoride, and in-situ modification of nano-...

Embodiment 1

[0038] Add 675g of N-methylpyrrolidone and 25g of lithium bistrifluoromethanesulfonimide to a 1.5L stirring tank, mechanically stir at 500rpm for 15min, then slowly add 75g of polyvinylidene fluoride, and stir at room temperature for 12 hours at 1500rpm, Then add 5.2g nano-ceramic material Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 (LLZTO) Stirring was continued for 6 hours, resulting in a beige suspension. Then, 1ml of 10wt% lithium methoxide solution was added dropwise under stirring at 2000rpm, and finally a highly dispersed orange suspension, ie NMP suspension B of PVDF-LTFSI-LLZTO, was obtained. Take 7ml of the suspension with a syringe, and cast a coating film of 50cm in a glass disc 2 , 80 ℃ dynamic vacuum drying for 16 hours, punch out a diaphragm with a diameter of 16mm, test the AC impedance spectrum and calculate the lithium ion conductivity to be 3.0x10 -4 S / cm. It can be seen that the composite solid electrolyte has higher lithium ion conductivity.

Embodiment 2

[0040] Add 675g of N-methylpyrrolidone and 25g of lithium bistrifluoromethanesulfonimide into a 1.5L stirring tank, mechanically stir at 500rpm for 15min, then slowly add 75g of polyvinylidene fluoride, and stir at room temperature for 12 hours at 1500rpm, Then add 5.2g nano-ceramic material Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 (LLZTO) continued to stir for 6 hours to obtain a beige suspension, then added dropwise 2ml of 10wt% lithium methoxide solution under stirring at 2000rpm, and finally obtained a highly dispersed tan suspension, that is, the NMP suspension of PVDF-LTFSI-LLZTO c. Take 7ml of the suspension with a syringe, and cast a film of 50cm in a glass or PTFE disc 2 , 80°C dynamic vacuum drying for 16 hours, punch out a diaphragm with a diameter of 16mm, test the AC impedance spectrum and calculate the lithium ion conductivity to be 2.6x10 -4 S / cm.

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Abstract

The invention relates to a composite solid electrolyte and a preparation method and application thereof, and the method comprises the following steps: carrying out high-energy dispersion treatment on a fluorine-containing polymer, a lithium salt, a nano ceramic material, an organic alkali metal compound and an organic solvent according to a mass ratio of 100: (1-200): (1-100): (0.001-10): (100-10000) at a rate of 500-50000 rpm, coating the slurry subjected to the high-energy dispersion treatment to prepare a film, and carrying out vacuum drying at 60-100 DEG C for 12-72 hours to obtain the composite solid electrolyte. And forming the composite solid electrolyte. The fluorine-containing polymer is fluorine-containing polymer, the organic alkali metal compound is organic alkali metal lithium,-F is removed from a C-F bond of the fluorine-containing polymer under the catalytic action of the organic alkali metal lithium in the high-energy dispersion treatment process, a polymer and nano lithium fluoride which are locally rich in pi electron double bond structures are generated, and a surface layer of the nano ceramic material is modified in situ through the nano lithium fluoride. Meanwhile, the polymer rich in the pi electron double bond structure, the lithium salt and the nano lithium fluoride in-situ modified nano ceramic material are synergistically coupled, so that the lithium ion conductivity of the composite solid electrolyte is improved, the generation of an interface phase is inhibited, and the low interface impedance is reduced.

Description

technical field [0001] The invention relates to the field of new energy technologies, in particular to a composite solid electrolyte and its preparation method and application. Background technique [0002] Improvements in energy density have been largely driven by overall battery technology advancements over the past 150 years, from lead-acid batteries in the 1850s, nickel-cadmium batteries in the 1890s, and nickel-metal hydride batteries in the 1960s to today's lithium-ion batteries. In the current era of lithium-ion batteries, the global electric vehicle market is growing rapidly, and people's demand for higher energy density, safer battery performance and longer driving range of electric vehicles is constantly increasing. [0003] With the frequent occurrence of thermal runaway accidents in portable electronic products and electric vehicles, safer lithium-ion batteries are urgently needed. All-solid-state lithium-ion batteries were born under such demand background. ...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/052
CPCY02E60/10
Inventor 苑克国葛志浩何华俊马德正
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD