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High-stability inorganic sulfide solid electrolyte and preparation method thereof

An inorganic sulfide and electrolyte layer technology, applied in the field of lithium-ion batteries, can solve the problems of reduced structural ionic conductivity, restrictions on the application of all-solid-state lithium batteries, and instability of inorganic sulfide electrolytes, and achieves a simple and effective preparation method, good air Stability, air stabilization effect

Active Publication Date: 2021-09-07
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the reported inorganic sulfide electrolytes containing P element are all unstable under air conditions.
This type of sulfide electrolyte has an irreversible chemical reaction with oxygen, water vapor, carbon dioxide, etc. in the air atmosphere, resulting in structural changes and a decrease in ion conductivity, which seriously restricts its application in all-solid-state lithium batteries.

Method used

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  • High-stability inorganic sulfide solid electrolyte and preparation method thereof
  • High-stability inorganic sulfide solid electrolyte and preparation method thereof
  • High-stability inorganic sulfide solid electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In a glove box, according to Li 6.1 P 0.9 SN 0.1 S 4.9 O 0.1 Cl elements in the proportions of Li weighed 2 S, p 2 S 5 , LiCl, SnS 2 , Li 2 O, each of the above material is placed in a zirconia ball mill jar 50ml, was added 50g of 5mm diameter zirconia beads. The sealed mill pot placed on a ball mill, the set rotational speed of 400 rpm, milling 12h. After milling the sample was collected and sealed in a vacuum quartz tube calcined. Temperature-programmed calcination temperature controlled, heated from room temperature to 550 deg.] C over 100min, and held at this temperature for 16h, then cooled to control 4h 50 ℃, Li can be obtained 6.1 P 0.9 SN 0.1 S 4.9 O 0.1 Cl solid electrolyte material.

Embodiment 2～11

[0045] Except in accordance with Li 7+a-c (P 1-a M ' a ) (S 6-b-c M " b ) X c The proportion of the elements weighed Li 2 S, p 2 S 5 , M'S 2 , Li 2 M ", LiX, the other when the same synthesis conditions in Example 1. Note that, depending on the composition, the heat treatment temperature and time are different.

Embodiment 12

[0047] In a glove box, according to Li 5.6 P 0.9 SN 0.1 S 4.4 Se 0.1 CL 1.5 The proportion of the elements weighed Li 2 S, p 2 S 5 , LiCl, SnS 2 , Li 2 Se, each of the above material is placed in a zirconia ball mill jar 50ml, was added 50g of 5mm diameter zirconia beads. The sealed mill pot placed on a ball mill, the set rotational speed of 400 rpm, milling 10h. After milling the sample was collected and sealed in a vacuum quartz tube calcined. Temperature-programmed calcination temperature controlled, heated from room temperature to 480 deg.] C over 100min, and held at this temperature for 8h, then cooled to control 4h 50 ℃, Li can be obtained 5.6 P 0.9 SN 0.1 S 4.4 Se 0.1 CL 1.5 The solid electrolyte material.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a high-stability inorganic sulfide solid electrolyte and a preparation method thereof. The general formula of the inorganic sulfide electrolyte material is Li<7+a-c<> (P<1-a>M') (S<6-b-c>M'') X<c> (I), wherein M' is one or more of Sn, Si, Al, Ge and Zr, M'' is one or more of Se, O and N, X is one or more of F, Cl, Br and I, a is larger than or equal to 0.01 and smaller than 0.5, b is larger than or equal to 0.01 and smaller than 5, and c is larger than or equal to 0.1 and smaller than 2. According to the inorganic sulfide solid electrolyte material and the preparation method thereof, sulfide solid electrolytes of various different types of solid solution phase structures are obtained by adjusting the proportions of P and M', S and M'' and M'and M'' in the inorganic sulfide solid electrolyte material, the obtained inorganic sulfide solid electrolyte material has better air stability, the sulfide solid electrolyte material can be further used in a drying room, the production process of the solid battery is simplified, and the production cost is reduced.

Description

Technical field [0001] The present invention belongs to the field of lithium ion battery technology, particularly relates to a solid electrolyte of a high stability of the inorganic sulfide and a preparation method. Background technique [0002] Since the lithium ion secondary battery commercialization, due to its high energy density, long life and other advantages of rapid development. However, the current widespread use of lithium-ion batteries as the battery liquid phase, containing combustible organic electrolyte solution, there is a serious safety hazard. In recent years, in a liquid lithium-ion battery safety accidents occur frequently so that further use of the system is greatly restricted. A non-combustible inorganic solid electrolyte material of a lithium ion battery, the battery can be eliminated not only the process of using an organic electrolyte battery internal leakage and thermal runaway due to safety problems, and can be used at a high temperature, extreme low tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M2300/0068Y02E60/10
Inventor 柏祥涛杨容弓胜民赵尚骞王建涛
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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