A kind of air stable sulfide sodium ion solid electrolyte and preparation method thereof

A solid electrolyte and sodium ion technology, applied in the direction of solid electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte, etc., can solve the problems of limiting the application of sulfide solid electrolyte, sensitivity, solid electrolyte failure, etc.
CN108390094BActive Publication Date: 2020-10-30HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2020-10-30

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Abstract

The invention discloses an air-stable sodium sulfide ion solid electrolyte and a preparation method thereof. The chemical formula of the sodium sulfide ion solid electrolyte is Na 4‑x sn 1‑x m x S 4‑y o y , wherein M is at least one of P, As, and Sb, 0.05≤x≤0.5, 0≤y≤0.5. Crystal structure of sulfide sodium ion solid electrolyte with I4 1 / acd space group, isolated [Sn / M] 4 Tetrahedra form the framework, and sodium ions fill the five unoccupied crystal sites. Sulfide sodium ion solid electrolytes are used to prepare all-solid-state batteries. The solid electrolyte material of the present invention has high ionic conductivity and is stable in the air, thereby solving the problem that the sulfide solid electrolyte in the prior art is very sensitive to air, and it is easy to generate sulfide hydrogen when exposed to the air, and at the same time cause the solid electrolyte to fail, limiting sulfide The application of solid electrolytes and the technical problems of increasing the cost of making batteries.
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Description

technical field

[0001] The invention belongs to the field of all-solid-state sodium-ion batteries, and more specifically relates to an air-stable sulfide sodium-ion solid electrolyte and a preparation method thereof. Background technique

[0002] At present, electrochemical energy storage technology is one of the most promising technologies for industrialization among many energy storage technologies due to its advantages of simplicity, high efficiency, and installation without site restrictions. Among them, lithium-ion batteries have high energy density, long cycle life, high working voltage, no memory effect, small self-discharge, relatively mature development, and are the most widely used electrochemical energy storage technology. It has a dominant advantage and is regarded as the main choice for large-scale energy storage power stations. However, the cost of lithium-ion batteries is relatively high, and the global resource reserves are limited, so it is impossible to me...

Claims

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