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Solid electrolyte material, preparation method thereof and solid-state lithium battery

A technology of solid electrolyte and solid electrolyte layer, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, electrolyte, etc., can solve the problems of low ionic conductivity, insufficient matching of layered oxide cathode materials, insufficient support for lithium ion migration, etc. , to achieve the effect of improving ionic conductivity, broad application prospects, and improving electrochemical stability

Inactive Publication Date: 2020-11-06
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

[0004] However, the current chloride solid electrolyte with high voltage stability in this system has low ionic conductivity, which is not enough to support the migration of lithium ions in solid-state lithium batteries; while the bromide solid electrolyte material with high ionic conductivity, its The oxidation onset potential is 3.15V, which is not enough to match the current mainstream 4V-level layered oxide cathode materials
The above deficiencies limit the further development and application of this system material.

Method used

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  • Solid electrolyte material, preparation method thereof and solid-state lithium battery
  • Solid electrolyte material, preparation method thereof and solid-state lithium battery
  • Solid electrolyte material, preparation method thereof and solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Li 3 YCl 5.7 f 0.3 solid electrolyte material

[0042] Weigh anhydrous YCl at a molar ratio of 0.9:3:0.1 3 , LiCl and YF 3 , mixed evenly and placed in a sealed quartz tube, heated to 520°C for 12 hours under vacuum for solid phase sintering, ground and crushed after cooling. The resulting product is F - Anion-doped Li 3 YCl 5.7 f 0.3 solid electrolyte material.

Embodiment 2

[0043] Example 2: Li 3 YBr 5.7 f 0.3 solid electrolyte material

[0044] Weigh the anhydrous YBr respectively according to the molar ratio of 0.9:3:0.1 3 , LiBr and YF 3 , mixed evenly and placed in a sealed quartz tube, heated to 530°C for 10h under vacuum for solid-phase sintering, ground and crushed after cooling. The resulting product is F - Anion-doped Li 3 YBr 5.7 f 0.3 solid electrolyte material.

Embodiment 3

[0045] Example 3: Li 2.5 YBr 5.0 f 0.5 solid electrolyte material

[0046] Weigh anhydrous YBr respectively according to molar ratio 2.5:7.5:0.5 3 , LiBr and YF 3 , mixed evenly and placed in a sealed quartz tube, heated to 530°C for 10h under vacuum for solid-phase sintering, ground and crushed after cooling. The resulting product is F - Anion-doped Li 2.5 YBr 5.0 f 0.5 solid electrolyte material.

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Abstract

The invention provides a solid electrolyte material, a preparation method thereof and a solid-state lithium battery. The chemical formula of the solid electrolyte material is LiaMX<3+> a-yX'y, wherein1.5 < = a < = 4.5, 0 < y < = 3.0, M is one of rare earth elements La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y and Sc, X is one of Cl, Br and I, and X' is at least one of F, Cl and Br'. The invention provides a solid electrolyte material. By doping halogen anions, the electrochemical stability is effectively improved, the ionic conductivity is further effectively improved after cation doping, the material can be compatible with a commercial positive electrode material, the material can be applied to an all-solid-state lithium secondary battery, a battery with high safety andrelatively high chemical stability and electrochemical stability can be obtained, and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, and more specifically, to a solid electrolyte material, a preparation method thereof, and a solid lithium battery. Background technique [0002] In conventional lithium-ion batteries, the carrier used to transport lithium ions between the positive and negative electrodes is in a liquid state. This liquid electrolyte is generally composed of lithium salts, organic solvents and additives. Due to the low flash point and boiling point of organic solvents, their stable temperature range is relatively narrow, which makes them volatile, flammable and explosive at higher temperatures. In the presence of liquid electrolyte, the heat generated by the battery under conditions such as overcharge and discharge, abuse, etc. will cause the electrolyte to volatilize and burn, thereby causing the battery to catch fire and explode. The use of solid electrolytes instead of liquid electrolytes as the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/058H01M2200/00H01M2300/0091Y02E60/10Y02P70/50
Inventor 徐国峰余金秋杨容罗亮赵尚骞余天玮段羿王建涛
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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