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Novel sulfide solid electrolyte and preparation method and application thereof

A solid electrolyte and sulfide technology, which is applied in the direction of sulfur compounds, chemical instruments and methods, lithium compounds, etc., can solve problems such as poor compatibility, battery capacity fading, and instability of sulfide electrolytes, and achieve high lithium negative electrode stability and air Stability, improvement of interface stability, effect of good air stability

Active Publication Date: 2021-03-16
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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  • Novel sulfide solid electrolyte and preparation method and application thereof
  • Novel sulfide solid electrolyte and preparation method and application thereof
  • Novel sulfide solid electrolyte and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0041] A certain proportion of Li 2 S, P 2 S 5 The precursor was mixed evenly in a glove set, placed in a 45mL zirconia ball mill jar, and 5 zirconia balls were added at the same time, sealed, and transferred to a ball mill. Ball mill at 370rpm for 60h. The ball-milled mixed powder was calcined at 270° C. for 4 h to obtain a sulfide solid electrolyte material without any doping.

Embodiment 2

[0043] will contain 2% LiNO 3 doping ratio of Li 2 S, P 2 S 5 The precursor was mixed evenly in a glove set, placed in a 45mL zirconia ball mill jar, and 5 zirconia balls were added at the same time, sealed, and transferred to a ball mill. Ball mill at 370rpm for 60h. The ball-milled mixed powder was calcined at 270°C and 290°C for 4 hours to obtain the final sulfide solid electrolyte material, and the optimal calcination temperature was selected.

Embodiment 3

[0045] In Example 2, the LiNO 3 The doping ratio was adjusted to 4%, except that, the same operation as in Example 2 was performed to obtain the sulfide solid electrolyte of Example 3 at the optimum calcination temperature.

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Abstract

The present invention discloses a novel sulfide solid electrolyte, and a preparation method and application thereof. The novel sulfide solid electrolyte comprises a compound having a nominal chemicalformula represented by the following general formula: Li3-0.02xP1-0.01xNxS4-0.04xO3x, wherein x=2, 4, 6, 8; the novel sulfide solid electrolyte has a PS43- / POS33- structure. According to the invention, a proper amount of LiNO3 is doped in the Li3PS4 glass electrolyte, and then a novel glass ceramic solid electrolyte with a PS43- / POS33- special structure is obtained through simple ball milling andcalcining methods, so that the stability of the sulfide solid electrolyte is improved. According to the sulfide solid electrolyte synthesized by the method, the interface stability of the sulfide solid electrolyte and a lithium metal negative electrode is improved, meanwhile, the air stability of the electrolyte is also improved, and a certain theoretical basis is laid for the practical application of an all-solid-state battery.

Description

technical field [0001] The patent of the invention belongs to the technical field of lithium batteries and all-solid-state batteries, and relates to a solid-state electrolyte for lithium batteries, in particular to a novel sulfide solid-state electrolyte and its preparation method and application. Background technique [0002] Lithium-ion batteries have dramatically changed the way we communicate and transport since they were first commercialized in 1991 due to 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 equipment. 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 lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(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