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Fully solid-state lithium secondary battery electrolyte material, preparation method thereof and fully solid-state lithium secondary battery

A technology for lithium secondary batteries and electrolyte materials, which is applied in the field of all-solid-state lithium secondary batteries, can solve the problems that lithium ion conductivity is difficult to achieve, and the conductivity needs to be further improved, so as to improve electrochemical stability and electrochemical stability. Good, improve the effect of conductivity

Active Publication Date: 2012-07-04
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium ion conductivity of the above solid electrolyte materials is difficult to reach 10 at room temperature. -3 S cm -1 , its conductivity still needs to be further improved

Method used

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  • Fully solid-state lithium secondary battery electrolyte material, preparation method thereof and fully solid-state lithium secondary battery
  • Fully solid-state lithium secondary battery electrolyte material, preparation method thereof and fully solid-state lithium secondary battery
  • Fully solid-state lithium secondary battery electrolyte material, preparation method thereof and fully solid-state lithium secondary battery

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preparation example Construction

[0042] The invention provides a method for preparing an electrolyte material for an all-solid lithium secondary battery, comprising the following steps:

[0043] Will Li 2 S, the first sulfide, the second sulfide and the dopant are mixed and then heat-treated or ground to obtain an electrolyte material for an all-solid lithium secondary battery, the first sulfide being GeS and / or GeS 2 , the second sulfide is FeS, FeS 2 、SiS 2 ,P 2 S 5 , B 2 S 3 、CeS 2 and Al 2 S 3 One or more of them, the dopant is a lithium salt or an oxide that can form ortho acid.

[0044] The present invention uses Li 2 S, the first sulfide, the second sulfide and the dopant are used as raw materials to prepare an all-solid-state lithium secondary battery electrolyte material, which has good properties such as electrical conductivity and electrochemical stability.

[0045] In the present invention, the Li 2 S and the second sulfide can form glass ceramics, that is, a composite material in whic...

Embodiment 1

[0066] Under the protection of argon atmosphere, Li with a purity of more than 99% 2 S, GeS 2 ,P 2 S 5 with Li 3 PO 4 After weighing according to the molar ratio of 1:0.1:0.2:0.05, grind it under the condition that the water content is less than 100ppm, mix it evenly, put it into a quartz glass tube, vacuumize it to a vacuum degree of less than 100Pa, and melt it with a hydrogen-oxygen flame. Seal, heat the quartz glass tube containing the above mixture to 500 °C at a heating rate of 2 °C / min, keep it warm for 24 hours, cool it to room temperature with the furnace, open the tube under the condition of water content of 0.1 ppm and grind it evenly again, Then put it into the quartz glass tube again, evacuate until the vacuum degree is less than 100Pa, seal it with a hydrogen-oxygen flame, heat it to 500°C at a heating rate of 2°C / min, keep it for 24 hours, cool it to room temperature with the furnace, and grind it evenly. Obtain an all-solid-state lithium secondary battery ...

Embodiment 2

[0071] Under the protection of argon atmosphere, Li with a purity of more than 99% 2 S, GeS 2 ,P 2 S 5 with Li 3 TaO 4 After weighing according to the molar ratio of 1:0.08:0.23:0.1, grind it under the condition that the water content is less than 100ppm, mix it evenly, put it into a quartz glass tube, vacuumize it to a vacuum degree of less than 100Pa, and melt it with a hydrogen-oxygen flame. Seal, heat the quartz glass tube containing the above mixture to 650 °C at a heating rate of 2 °C / min, keep it warm for 12 hours, cool it to room temperature with the furnace, open the tube under the condition of water content of 0.1 ppm and grind it evenly again. Obtain an all-solid-state lithium secondary battery electrolyte material, that is, Li 3 TaO 4 Doped Li 2 S-GeS 2 -P 2 S 5 system.

[0072] According to the method of Example 1, the electrochemical performance of the all-solid-state lithium secondary battery electrolyte material obtained in this example was tested, a...

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Abstract

The invention provides a fully solid-state lithium secondary battery electrolyte material, which contains Li2S, a first sulfide, a second sulfide and a dopant, wherein the first sulfide is GeS and / or GeS2; the second sulfide is one or more of FeS, FeS2, SiS2, P2S5, B2S3, CeS2 and Al2S3; and the dopant is a lithium salt or an oxide capable of forming raw acid. According to the fully solid-state lithium secondary battery electrolyte material, the lithium ion conductivity of the fully solid-state lithium secondary battery electrolyte material at room temperature is increased by using the first sulfide, the second sulfide and the dopant. Experiments show that the lithium ion conductivity of the fully solid-state lithium secondary battery electrolyte material reaches up to 10<-3> S.cm<-1> at the room temperature, the conductivity is better, and the application is facilitated. In addition, the lithium ion conductivity of the fully solid-state lithium secondary battery electrolyte material has better electrochemical stability. The invention provides a preparation method of the lithium ion conductivity of the fully solid-state lithium secondary battery electrolyte material and a fully solid-state lithium secondary battery.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to an electrolyte material for an all-solid lithium secondary battery, a preparation method thereof, and an all-solid lithium secondary battery. Background technique [0002] Lithium secondary batteries have many advantages such as high energy density, large output power, high average output voltage, small self-discharge, no memory effect, fast charge and discharge, excellent cycle performance and no environmental pollution. The preferred object of the rechargeable power supply, also considered to be the most competitive vehicle power battery. Among them, all-solid-state lithium secondary batteries using solid-state electrolyte materials have good safety, so they are more in line with the current development direction of automotive power batteries. [0003] As one of the core components of all-solid-state lithium secondary batteries, solid-state electrolyte mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 许晓雄姚霞银刘兆平辛星武玺旺
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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