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Ultrathin solid electrolyte of lithium battery and preparation method thereof

A solid electrolyte, lithium battery technology, applied in solid electrolyte, electrolyte battery manufacturing, electrolyte and other directions, can solve the problems of complex synthesis method, affecting the performance of electrolyte lithium ion battery, difficult to control thickness and uniformity, etc., to reduce the macro thickness, The overall structure is uniform and dense, and the performance is excellent

Inactive Publication Date: 2019-04-30
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the LPS-based solid electrolyte for lithium-ion batteries in the prior art has the problems of complex synthesis methods, difficult control of thickness and uniformity, which affects the performance of the electrolyte and even lithium-ion batteries

Method used

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  • Ultrathin solid electrolyte of lithium battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Will Li 2 S and P 2 S 5 The powder was added into tetrahydrofuran (THF) solvent, Li 2 S, P 2 S 5 The molar ratio of THF to THF is 3:1:6. Under the condition of heating in a water bath at 66°C, vigorously stir the reaction at a speed of 680r / min for 24.5h. Dry at 16Pa for 19h to obtain white powder Li 3 P.S. 4 3THF; add 28kg of white powder into 72kg of anhydrous acetonitrile solvent, stir and react at a speed of 360r / min for 44min under heating in a water bath at a temperature of 86°C, until the solution turns blue completely; then immerse the polished silicon substrate in the solution , after standing still for 8.5h, the substrate was taken out, then hot-pressed for 7s at a temperature of 206°C and a pressure of 206MPa, and finally the substrate was peeled off to obtain an ultra-thin solid electrolyte for a lithium battery.

[0030] testing method:

[0031](1) Average thickness: the electrolyte membrane prepared by the present invention is cut into a sample of ...

Embodiment 2

[0035] Will Li 2 S and P 2 S 5 The powder was added into tetrahydrofuran (THF) solvent, Li 2 S, P 2 S 5 The molar ratio of THF to THF is 3:1:6, and the temperature is 62°C under the condition of water bath heating, and the reaction is vigorously stirred at a speed of 650r / min for 25h. After the reaction is completed, filter, and then the obtained white precipitate is at room temperature. Dry at 12Pa for 21h to obtain white powder Li 3 P.S. 4 3THF; add 25kg of white powder into 75kg of anhydrous acetonitrile solvent, stir and react at a speed of 320r / min for 48min under heating in a water bath at a temperature of 82°C, until the solution turns blue completely; then immerse the polished copper substrate in the solution After standing for 8 hours, the substrate was taken out, and then hot-pressed for 8 seconds at a temperature of 202°C and a pressure of 202 MPa, and finally the substrate was peeled off to obtain an ultra-thin solid electrolyte for a lithium battery.

[003...

Embodiment 3

[0038] Will Li 2 S and P 2 S 5 The powder was added into tetrahydrofuran (THF) solvent, Li 2 S, P 2 S 5 The molar ratio of THF to THF is 3:1:6, and the temperature is 68 °C under the condition of water bath heating, and the reaction is vigorously stirred at a speed of 760r / min for 24 hours. Dry at 18Pa for 19h to obtain white powder Li 3 P.S. 4 3THF; add 35kg of white powder into 65kg of anhydrous acetonitrile solvent, stir and react at a speed of 380r / min for 42min under heating in a water bath at a temperature of 88°C, until the solution turns blue completely; then immerse the polished nickel substrate in the solution , after standing for 9 hours, the substrate was taken out, then hot-pressed for 6 seconds at a temperature of 208°C and a pressure of 208 MPa, and finally the substrate was peeled off to obtain an ultra-thin solid electrolyte for a lithium battery.

[0039] The test method is consistent with Example 1, and the obtained data are shown in Table 1.

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Abstract

The invention belongs to the technical field of lithium batteries, and provides an ultrathin solid electrolyte of a lithium battery and a preparation method thereof. In the method, Li2S and P2S5 are added into tetrahydrofuran, the mixture is heated in a water both and stirred for a reaction, obtained white power is added into anhydrous acetonitrile, a water bath heating is carried out for a reaction until the solution completely turns blue, a polished substrate is immersed in the solution, taken out after standing and hot-pressed, and the substrate is peeled off to prepare the ultrathin solidelectrolyte of the lithium battery. Compared with a conventional method, the solid electrolyte prepared by the preparation method of the invention is formed by stacking nanosheets, is uniform and compact in overall structure, significantly reduces the macroscopic thickness of the electrolyte without affecting the mechanical and chemical properties of the electrolyte, and realizes an ultrathin structure. The preparation method is simple and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and provides an ultra-thin solid electrolyte for lithium batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on lithium ions to move between positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. It has high energy density, strong stability, no memory effect, and long cycle life, and has been widely used as a commercial high-efficiency energy storage device. [0003] The electrolyte is the intermediate component of the lithium-ion battery, which larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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