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A new type of sulfide solid-state electrolyte and its preparation method and use

A solid electrolyte and sulfide technology, applied in the direction of sulfur compounds, chemical instruments and methods, lithium compounds, etc., can solve the problems of unstable sulfide electrolytes, easy chemical reactions, battery capacity decay, etc., to achieve excellent air stability, The effect of good air stability and high air stability

Active Publication Date: 2022-07-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the poor interface compatibility between the sulfide solid electrolyte and the metal lithium anode, chemical reactions are prone to occur, lithium dendrites, or even "dead lithium" and other phenomena appear, resulting in battery capacity decay, so it is difficult to directly apply the lithium anode to the sulfide all-solid state. battery
[0007] In addition, sulfide electrolytes are extremely unstable to air and water and produce toxic gases upon contact

Method used

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  • A new type of sulfide solid-state electrolyte and its preparation method and use
  • A new type of sulfide solid-state electrolyte and its preparation method and use
  • A new type of sulfide solid-state electrolyte and its preparation method and use

Examples

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Embodiment 1

[0041] A certain proportion of Li 2 S.P 2 S 5 The precursors were uniformly mixed in a hand suit, placed in a 45 mL zirconia ball mill jar, and 5 zirconia balls were added at the same time, sealed, and transferred to the ball mill. Ball milled at 370rpm for 60h. The ball-milled mixed powder was calcined at 270 °C for 4 h to obtain an undoped sulfide solid-state electrolyte material.

Embodiment 2

[0043] will contain 2% LiNO 3 Doping ratio of Li 2 S.P 2 S 5 The precursors were uniformly mixed in a hand suit, placed in a 45 mL zirconia ball mill jar, and 5 zirconia balls were added at the same time, sealed, and transferred to the ball mill. Ball milled at 370rpm for 60h. The ball-milled mixed powder was calcined at 270°C and 290°C for 4 h to obtain the final sulfide solid-state electrolyte material, and the optimum calcination temperature was screened.

Embodiment 3

[0045] In Example 2, LiNO 3 Except that the doping ratio was adjusted to 4%, the same operation as in Example 2 was carried out, and the sulfide solid state electrolyte of Example 3 was obtained at the optimum calcination temperature.

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Abstract

The present invention discloses a novel sulfide solid-state electrolyte, a preparation method and application thereof, and the novel sulfide solid-state electrolyte comprises a compound whose nominal chemical formula is the following general formula: Li 3‑0.02x P 1‑0.01x N x S 4‑0.04x O 3x , where x=2, 4, 6, 8; the new sulfide solid electrolyte has PS 4 3‑ / POS 3 3‑ structure. The present invention is in Li 3 PS 4 Doping an appropriate amount of LiNO into glass electrolytes 3 , and then a new type of PS with PS was obtained by a simple ball milling and calcination method. 4 3‑ / POS 3 3‑ The special structure of the glass-ceramic solid electrolyte can improve the stability of the sulfide solid electrolyte. The sulfide solid electrolyte synthesized by this method improves the interface stability between the sulfide solid electrolyte and the lithium metal anode, and also improves the air stability of the electrolyte, which lays a certain theoretical foundation for the practical application of all-solid-state batteries.

Description

technical field [0001] The patent of the invention belongs to the technical field of lithium batteries and all-solid-state batteries, relates to a solid-state electrolyte for lithium batteries, and in particular relates to a novel sulfide solid-state electrolyte and a preparation method and application thereof. Background technique [0002] Since their first commercialization in 1991, lithium-ion batteries have dramatically changed the way we communicate and transport because of their high energy density and long cycle life. At present, the traditional lithium-ion battery with graphite as the negative electrode is close to its energy density limit, and still cannot meet the urgent energy density requirements of electric vehicles and cutting-edge electronic devices. Therefore, there is an urgent need to develop new battery systems to surpass conventional Li-ion batteries. [0003] All-solid-state batteries use solid electrolytes instead of liquid electrolytes in traditional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M10/42C01D15/00C01B17/98
CPCH01M10/0562H01M10/0525H01M10/4235C01D15/00C01B17/98C01P2002/85C01P2002/72C01P2006/40Y02E60/10
Inventor 杨文尼亚·艾哈迈德陈人杰于佩雯
Owner BEIJING INSTITUTE OF TECHNOLOGYGY