Fluorine-doped lithium-ion solid electrolyte and preparation method thereof

A solid electrolyte, lithium ion technology, used in circuits, electrical components, secondary batteries, etc., can solve the problem of low lithium ion conductivity, and achieve the effect of improving the migration speed

Active Publication Date: 2016-11-16
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the conductivity of lithium ions is too low, the invention provides a kind of F-doped lithium ion solid electrolyte and its preparation method

Method used

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  • Fluorine-doped lithium-ion solid electrolyte and preparation method thereof
  • Fluorine-doped lithium-ion solid electrolyte and preparation method thereof
  • Fluorine-doped lithium-ion solid electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: In this technical scheme, Li 2 S: GeS 2 :P 2 S 5 : LiF is uniformly mixed according to the ratio of 4.95: 1.1: 0.95: 0.1 (molar ratio), the mixed raw materials are put into a ball mill jar, and under the protection of an argon atmosphere, ball mill at a speed of 500 rpm for 10 hours. The powder after ball milling is pressed into electrolyte sheets under a pressure of 200Mpa, and the electrolyte sheets are placed in a vacuum atmosphere tube furnace, heated to 600°C at a rate of 2°C / min in an argon atmosphere, and kept at 600°C 10h sintered into a dense solid electrolyte sample sheet. Such as figure 1 is composed of Li 10 Ge 1.1 P 1.9 S 11.9 f 0.1 , the AC impedance diagram of the solid electrolyte sheet under the electrochemical workstation, and the conductivity calculated from the diagram is 2.3×10 -2 S / cm.

Embodiment 2

[0022] Embodiment 2: Li 2 S: SnS 2 :P 2 S 5 : LiF is evenly mixed according to the ratio of 4.85: 1.1: 0.95: 0.2 (molar ratio), the mixed raw materials are put into a ball mill jar, and under the protection of an argon atmosphere, ball mill at a speed of 350 rpm for 24 hours. The powder after ball milling is pressed into electrolyte sheets under a pressure of 150Mpa, and the electrolyte sheets are placed in a vacuum atmosphere tube furnace, heated to 650°C at a rate of 3°C / min under an argon atmosphere, and kept at 650°C 8h sintered into a dense solid electrolyte sample sheet. Such as figure 2 is composed of Li 9.9 sn 1.1 P 1.9 S 11.8 f 0.2 , the AC impedance diagram of the solid electrolyte sheet under the electrochemical workstation, and the conductivity calculated from the diagram is 2.8×10 -2 S / cm.

Embodiment 3

[0023] Embodiment 3: with Li 2 S: SiS 2 :P 2 S 5 : LiF is evenly mixed according to the ratio of 4.75: 1.1: 0.95: 0.3 (molar ratio), the mixed raw materials are put into a ball mill jar, and under the protection of an argon atmosphere, ball mill at a speed of 300 rpm for 25 hours. The powder after ball milling is pressed into electrolyte sheets under a pressure of 100Mpa, and the electrolyte sheets are placed in a vacuum atmosphere tube furnace, heated to 550°C at a rate of 2°C / min in an argon atmosphere, and kept at 550°C 30h sintered into a dense solid electrolyte sample sheet. Such as image 3 is composed of Li 9.8 Si 1.1 P 1.9 S 11.7 f 0.3 , the AC impedance diagram of the solid electrolyte sheet under the electrochemical workstation, and the conductivity calculated from the diagram is 2.9×10 -2 S / cm.

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Abstract

The invention belongs to the field of manufacturing of lithium-ion electrolytes and particularly relates to a fluorine-doped lithium-ion solid electrolyte and a preparation method thereof. A stoichiometric equation of the lithium-ion solid electrolyte is Li<10+x-y>M<1+x>P<2-x>S<12-y>F<y>, wherein x=0.1-1.0; y=0.1-0.3; and M is Ge, Si or Sn. According to the prepared Li<10+x-y>M<1+x>P<2-x>S<12-y>F<y> lithium-ion solid electrolyte, S<2-> is replaced with partial F<-> to form a P-F<4> covalent bond; the bond energy of a P-F covalent bond is greater than that of a P-S covalent bond; the constraints of fluorine ions on lithium ions are weakened through reinforcement of the P-F bond; and the migration rate of the lithium ions is improved. The lithium ion conductivity of the Li<10+x-y>M<1+x>P<2-x>S<12-y>F<y> lithium-ion solid electrolyte reaches 2.0*10<-2>S / cm and more.

Description

technical field [0001] The invention belongs to the field of manufacturing lithium ion electrolytes, in particular to a fluorine-doped lithium ion solid electrolyte and a preparation method thereof. Background technique [0002] With the development of industrial society, the increase in energy consumption and the depletion of non-renewable resources, people's demand for new energy is becoming more and more urgent, and the requirements for energy storage technology are becoming more and more stringent. In today's society, lithium-ion batteries are a key energy storage system. They can be used as energy storage for hybrid vehicles, pure electric vehicles, and even wind and solar energy. Automotive power batteries have higher requirements for lithium-ion batteries, mainly requiring battery materials to have the characteristics of low price, good safety performance, high energy density, good charge and discharge rate performance, and long service life. However, most of the lit...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562Y02E60/10
Inventor 李文龙张洪刘欢王红飞杨利青王浩静
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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