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Sulfide solid electrolyte and preparation method and application thereof

A solid electrolyte and sulfide technology, applied in solid electrolytes, non-aqueous electrolytes, halide silicon compounds, etc., can solve the problems of low conductivity and poor stability, and achieve excellent lithium ion conductivity and excellent air stability.

Pending Publication Date: 2022-06-07
SVOLT ENERGY TECH (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The sulfide solid electrolyte provided by the above scheme has the problem of poor stability or low conductivity. Therefore, it is necessary to develop a sulfide solid electrolyte with good stability and high conductivity.

Method used

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  • Sulfide solid electrolyte and preparation method and application thereof
  • Sulfide solid electrolyte and preparation method and application thereof
  • Sulfide solid electrolyte and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This embodiment provides a sulfide solid state electrolyte, and the sulfide solid state electrolyte is prepared by the following method:

[0039] Will Li 2 S, SiS 2 , SiO 2 , Sb 2 S 5 , LiI was added to the roller mill at a molar ratio of 56:7:5:4:20, and zirconia balls were added at the same time. The mass ratio of balls and raw materials was 10:1. The precursor powder was obtained by mixing at 300rpm for 24h. After the mixing was completed, the product was sintered at 550 °C for 12 h under an argon atmosphere to obtain the final product Li 6.6 Si 0.6 Sb 0.4 S 4.5 O 0.5 I electrolyte, the electrochemical window of the electrolyte can reach 6V. The phase of the sulfide solid state electrolyte is a sulfite phase.

[0040] The X-ray diffraction spectrum of the sulfide solid electrolyte is as follows figure 1 shown.

[0041] The SEM image of the sulfide solid electrolyte is as follows Figure 2-3 shown.

Embodiment 2

[0043] This embodiment provides a sulfide solid state electrolyte, and the sulfide solid state electrolyte is prepared by the following method:

[0044] Will Li 2 S, SiS 2 , SiO 2 , Sb 2 S 5, LiI was added to the high-energy ball mill at a molar ratio of 56:9:3:4:20, and zirconia balls were added at the same time. The mass ratio of balls to raw materials was 20:1. The precursor powder was obtained by mixing at 550rpm for 12h. The product was sintered at 450 °C for 6 h under vacuum to obtain the final product Li 6.6 Si 0.6 Sb 0.4 S 4.7 O 0.3 I electrolyte, the electrochemical window of the electrolyte can reach 5V. The phase of the sulfide solid state electrolyte is a sulfite phase.

Embodiment 3

[0046] This embodiment provides a sulfide solid state electrolyte, and the sulfide solid state electrolyte is prepared by the following method:

[0047] Will Li 2 S, SiS 2 , SiO 2 , Sb 2 S 5 , LiI was added to the mortar according to the molar ratio of 56:5:7:4:20, and the precursor powder was obtained by hand grinding and mixing for 4h. The product was sintered at 500 °C for 12 h under nitrogen atmosphere to obtain the final product Li 6.6 Si 0.6 Sb 0.4 S 4.3 O 0.7 I electrolyte. The phase of the sulfide solid state electrolyte is a sulfite phase.

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Abstract

The invention provides a sulfide solid electrolyte and a preparation method and application thereof, the chemical formula of the sulfide solid electrolyte is Li Si Sb < c > S < 5-x > O < x > I, a is greater than or equal to 6 and less than or equal to 7, b is greater than or equal to 0.5 and less than or equal to 0.7, c is greater than or equal to 0.3 and less than or equal to 0.5, and 1lt is 0; xlt; 1, the phase of the sulfide solid electrolyte is an argyrodite phase, the stability of the sulfide solid electrolyte in an organic solvent and air can be improved by doping antimony and oxygen elements in the electrolyte, and meanwhile, the conductivity of the sulfide solid electrolyte is improved;

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a sulfide solid-state electrolyte and a preparation method and application thereof. Background technique [0002] All-solid-state batteries use non-flammable inorganic solid electrolytes to replace traditional organic electrolytes that are inflammable, explosive and leaky, and have inherently high safety characteristics. At the same time, metal anode materials can be introduced to further improve the energy density of batteries. Important development direction of specific energy battery. [0003] As a key part of all-solid-state batteries, sulfide solid electrolytes have high room temperature ionic conductivity and good interfacial contact with electrode materials, and are the most promising inorganic solid electrolytes. However, the sulfide solid electrolyte is unstable to organic solvents, which is not conducive to the development of electrolyte wet coating process...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525C01B33/08
CPCH01M10/0562H01M10/0525C01B33/08H01M2300/0068C01P2006/40C01P2004/61C01P2002/72C01P2004/03Y02E60/10
Inventor 陈少杰刘景超黄海强李瑞杰王磊
Owner SVOLT ENERGY TECH (WUXI) CO LTD
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