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Separable and recyclable sulfide-type solid electrolyte and its application

A solid electrolyte, separation and recovery technology, applied in the field of materials, can solve the problems of extremely poor air stability, increase difficulty, increase cost, etc., achieve the effects of reducing polarization overpotential, high ion conductivity, and improving cycle life

Active Publication Date: 2022-04-29
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In short, the extremely poor air stability of sulfide solid-state electrolytes affects the production, storage, and transportation of sulfide solid-state electrolyte materials, and the production and use of sulfide all-solid-state batteries.
The above-mentioned links need to be isolated from water and oxygen, and are carried out in a vacuum environment and an inert gas atmosphere, which severely limits the production of sulfide solid electrolytes, increases the difficulty of preparation and processing, and limits their large-scale application in all-solid-state lithium batteries. , Increase the cost of production and processing

Method used

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  • Separable and recyclable sulfide-type solid electrolyte and its application
  • Separable and recyclable sulfide-type solid electrolyte and its application
  • Separable and recyclable sulfide-type solid electrolyte and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0049] This example provides unmodified Li 4 SnS 4 The preparation process of the electrolyte material, which is also used as a comparison benchmark for the material properties of the separable and recoverable sulfide-type solid electrolyte proposed by the present invention in the subsequent embodiments.

[0050] This embodiment selects Li 2 S is Li source, SnS 2 As a Sn source, the air-stable (the water can be removed by heating after absorbing water after exposure to humid air / crystallization water to restore the original crystal structure) sulfide electrolyte Li by solid-phase method 4 SnS 4 ,Specific steps are as follows:

[0051] Will Li 2 S, SnS 2 The raw materials are weighed according to the design ratio and put into the ball milling jar, and the powder mass in each ball milling jar is 1g in total;

[0052] Two ball mill jars with raw materials are sealed, and placed in a planetary ball mill for ball milling for 40 hours;

[0053] After the ball milling is comp...

Embodiment 2

[0057] This example provides As-doped modified Li 4 SnS 4 Preparation process of electrolyte material.

[0058] In this embodiment, the commercially available and cheap Li 2 CO 3 is Li source, CS 2 as S source, SnO 2 is the Sn source, As 2 S 3 As a source of As, synthesize a sulfide electrolyte Li with high air stability (the water can be removed by heating / crystallization water to restore the original crystal structure after exposure to humid air and water absorption) and high ion conductivity 4-x sn 1-x As x S 4 (0<x≤30%), the specific steps are as follows:

[0059] Will Li 2 CO 3 , SnO 2 、As 2 S 3 The raw materials were weighed according to the designed ratio and ground in a mortar for 30 min, and the total powder mass was 1 g, which was placed in an alumina crucible.

[0060] Add 50mL-100mL of CS 2 Liquid, add to a scrubber bottle with a capacity of 100mL.

[0061] Put the crucible filled with raw materials into the center of the quartz tube of the tube f...

Embodiment 3

[0068] This example provides Sb-doped modified Li 4 SnS 4 Preparation process of electrolyte material.

[0069] In this embodiment, the commercially available and cheap Li 2 CO 3 is Li source, CS 2 as S source, SnO 2 is the Sn source, Sb 2 o 5 As a Sb source, synthesize a sulfide electrolyte Li with high air stability (the water can be removed by heating / crystallization water to restore the original crystal structure after exposure to humid air and water absorption) and high ion conductivity 4-x sn 1-x Sb x S 4 (0<x≤20%), the specific steps are as follows:

[0070] Will Li 2 CO 3 , SnO 2 , Sb 2 o 5 The raw materials were weighed according to the designed ratio and ground in a mortar for 30 minutes, and the total powder mass was 1 g, which was placed in an alumina crucible.

[0071] Add 50mL-100mL of CS 2 Liquid, add to a scrubber bottle with a capacity of 100mL.

[0072] Put the crucible filled with raw materials into the center of the quartz tube of the tube...

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Abstract

The invention relates to a separable and recoverable sulfide-type solid electrolyte and its application. The sulfide-type solid electrolyte is a P-free Sn-based sulfide with a general formula of Li a sn b A c S d Wherein A is an element for doping and replacing Sn, at least one selected from As, Sb, Bi, Si, W, Mo, and 0<a≤4, 0≤b≤1, 0≤c≤0.3, d=4; the sulfide-type solid electrolyte is dissolved in water, and the sulfide-type solid electrolyte after absorbing water is heat-treated, and the material crystal structure after heat treatment is the same as the material crystal structure of the original sulfide-type solid electrolyte Similarly, the decrease of ionic conductivity is less than 5%; the temperature of the heat treatment is 150°C-700°C.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a separable and recoverable sulfide-type solid electrolyte and its application. Background technique [0002] As a key technology to achieve high safety and high energy density batteries, all-solid-state batteries have attracted extensive attention from academia and industry. All-solid-state batteries use solid-state electrolytes with high thermal stability, density, and mechanical strength as ionic conductors to replace organic electrolytes and separators used in liquid lithium-ion batteries, which can effectively solve the flammability of organic electrolytes and the penetration of negative lithium dendrites. The diaphragm causes problems such as short circuit, which greatly improves the safety of the battery. In recent years, with the emergence of ultrafast solid-state ionic conductors, the long-range migration and transportation of lithium ions in the electrolyte is no lon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/052
CPCH01M10/0562H01M10/052H01M2300/0068Y02E60/10
Inventor 吴凡卢普顺李泓
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD