Composite solid electrolyte material, preparation method thereof, and all-solid-state lithium ion secondary battery containing electrolyte material

A solid electrolyte and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems such as the decrease of electrolyte ion conductivity, achieve high stability and overcome the effect of assembly operation

Inactive Publication Date: 2017-06-23
CHINA AUTOMOTIVE BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfur-based electrolytes are sensitive to water and will react with water to generate hydrogen sulfide gas. Even a small amount of water vapor contained in the air will directly react with sulfur-based electrolytes, resulting in a significant drop in the ionic conductivity of the electrolyte.
At the same time, this characteristic of chalcogenide electrolytes also greatly increases the process complexity of the battery assembly process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Li with a purity of more than 99.5% 2 S, P 2 S 5 and Li 2 O is weighed according to the molar ratio of 74:25:1, manually ground and mixed evenly in an environment with a water content of less than 200ppm, and then ball milled with a high-energy ball mill for 48 hours at a speed of 370rpm and a ball-to-material ratio of 20:1 to obtain the reaction Intermediate product, grind the intermediate product evenly and press it into tablets, heat the sheet-shaped intermediate product to 240 °C at a heating rate of 5 °C / min under an argon atmosphere, keep it warm for 4 hours, naturally cool it to room temperature under the protection of argon gas, and then take it out for sintering The product is ground evenly to obtain a ratio of 74Li 2 S·25P 2 S 5 · Li 2 O's glass-ceramic state electrolyte material.

[0027] 74Li 2 S·25P 2 S 5 · Li 2 The glass-ceramic electrolyte material of O is placed on the rotating substrate, and lithium titanate is used as the target material, pl...

Embodiment 2

[0030] Li with a purity of more than 99.5% 2 S, P 2 S 5 and LiI according to the molar ratio of 72:25:3, manually grind and mix evenly in an environment with a water content of less than 200ppm, and then use a high-energy ball mill for 24 hours to obtain For the reaction intermediate product, grind the intermediate product evenly and press it into tablets, heat the sheet-shaped intermediate product to 250 °C at a heating rate of 5 °C / min under an argon atmosphere, keep it warm for 2 hours, and take it out after naturally cooling to room temperature under the protection of argon gas The sintered product is ground evenly, and the obtained ratio is 72Li 2 S·25P 2 S 5 · 3LiI glass-ceramic electrolyte material.

[0031] 72Li 2 S·25P 2 S 5 3LiI glass-ceramic electrolyte material is placed on the rotating substrate, lithium niobate is used as the target material, placed in the radio frequency sputtering equipment, the equipment is evacuated and argon is introduced, and argon ...

Embodiment 3

[0033] Li with a purity of more than 99.5% 2 S, P 2 S 5 and GeS 2 After weighing according to the molar ratio of 75:23:2, manually grind and mix evenly in an environment with a water content of less than 200ppm, and then ball mill with a high-energy ball mill for 48 hours under the conditions of a rotation speed of 500rpm and a ball-to-material ratio of 10:1 to obtain the reaction medium. Grind the intermediate product evenly and press it into tablets. Heat the sheet-shaped intermediate product to 240°C at a heating rate of 2°C / min in an argon atmosphere, keep it warm for 4h, and take out the sintered product after naturally cooling to room temperature under the protection of argon gas. Grind evenly to obtain a ratio of 75Li 2 S·23P 2 S 5 2GeS 2 glass-ceramic state electrolyte material.

[0034] Will 75Li 2 S·23P 2 S 5 2GeS 2 The glass-ceramic electrolyte material is placed on a rotating base plate, and lithium tungstate is used as a target material, placed in a pul...

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Abstract

The invention discloses a composite solid electrolyte material, a preparation method thereof, and an all-solid-state lithium ion secondary battery containing the electrolyte material. The composite solid electrolyte material comprises a core and a surface coating which covers the surface of the core, the core is inorganic chalcogenide glass ceramic state electrolyte, and the surface coating is a lithium compound which does not react with air and moisture in air. The preparation method of the composite solid electrolyte material is as follows: firstly the inorganic chalcogenide glass ceramic state electrolyte core is prepared, and then a radio frequency sputtering method or pulse laser deposition is used for coating the lithium compound which does not react with air and moisture in air on the surface of the inorganic chalcogenide glass ceramic state electrolyte. The composite solid electrolyte material has high stability in air, and can be assembled into all-solid-state batteries in the environment of common battery plant, in order to overcome the problem that prior chalcogenide electrolyte must be assembled and operated in an anhydrous condition.

Description

technical field [0001] The invention relates to a composite solid electrolyte material, a preparation method thereof and an all-solid lithium ion secondary battery containing the electrolyte material, belonging to the technical field of lithium ion batteries. Background technique [0002] Today, with the rapid development of information technology and the increasing emphasis on environmental protection, the development of chemical power sources is facing greater challenges. Lithium-ion batteries have achieved rapid development due to their excellent characteristics such as high energy density, high output voltage, long service life, good cycle performance, low self-discharge rate, no memory effect, and environmental friendliness. The output and output value continue to increase. Rapidly expanding, it has been widely used in electronic products such as mobile phones, notebook computers, cameras, vehicles such as electric vehicles and electric bicycles, aerospace vehicles such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0068Y02E60/10
Inventor 杨容李久铭弓胜民赵尚骞张立王琳王建涛孙浩博卢世刚
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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