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Sulfide solid electrolyte and preparation method and application thereof

A solid electrolyte and sulfide technology, applied in the field of lithium-ion batteries, can solve the problems of low conductivity and poor stability, and achieve excellent lithium-ion conductivity and excellent air stability

Pending Publication Date: 2022-05-27
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

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Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a sulfide solid state electrolyte, which is prepared by the following method:

[0037] Will Li 2 S, SiS 2 , Sb 2 S 5 , LiI, LiBr were added to the roller mill at a molar ratio of 28:6:4:7:3, 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 24 hours. After the mixing was completed, the product was sintered at 550 °C for 12 hours under an argon atmosphere to obtain the final product Li 6.6 Si 0.6 Sb 0.4 S 5 I 0.7 Br 0.3 , the sheet density of the sulfide solid electrolyte is 95%.

[0038] The X-ray diffraction spectrum of the sulfide solid electrolyte is as follows figure 1 As shown, in the X-ray diffraction pattern, the characteristic peak 2Theta values ​​of the sulfide solid electrolyte are 24.55°, 17.32°, 30.17°, 28.86°, 43.18°, 50.26°, 39.28° and 45.93° in sequence. Intensity I of the (111) plane of the LiI crystal phase I (...

Embodiment 2

[0040] This embodiment provides a sulfide solid state electrolyte, which is prepared by the following method:

[0041] Will Li 2 S, SiS 2 , Sb 2 S 5, LiI, LiBr were added to the high-energy ball mill at a molar ratio of 28:6:4:9:1, and zirconia balls were added at the same time. The mass ratio of balls to raw materials was 20:1, and the precursor powder was obtained by mixing at 550rpm for 12 hours. The product was sintered under vacuum at 450 °C for 6 hours to obtain the final product Li 6.6 Si 0.6 Sb 0.4 S 5 I 0.9 Br 0.1 , the sheet density of the sulfide solid electrolyte is 96%.

Embodiment 3

[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 , Sb 2 S 5 , LiI, and LiBr were added into a mortar at a molar ratio of 28:6:4:3:7, and the precursor powder was obtained by hand-milling and mixing for 4 hours. The product was sintered at 500 °C for 12 hours in a nitrogen atmosphere to obtain the final product Li 6.6 Si 0.6 Sb 0.4 S 5 I 0.3 Br 0.7 , the sheet density of the sulfide solid electrolyte is 93%.

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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 LiaSibSbcSdI (1-x) Brx, a is more than or equal to 6 and less than or equal to 7, b is more than or equal to 0.5 and less than or equal to 0.7, c is more than or equal to 0.3 and less than or equal to 0.5, d is more than or equal to 4.5 and less than or equal to 5.5, and 1lt is 0; xlt; the phase of the sulfide solid electrolyte comprises an argyrodite phase and a LiI crystal phase, the stability of the sulfide solid electrolyte in an organic solvent and air can be improved by doping antimony and bromine 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 have inherent high safety and high theoretical energy density, and are an important development direction for the next generation of large-scale energy storage devices. [0003] Solid-state electrolytes are a key part of all-solid-state batteries. Among them, sulfide solid electrolytes have the highest room temperature ionic conductivity, strong processability and good interfacial contact, and are the most promising inorganic solid electrolytes. However, sulfide solid electrolytes are easily decomposed in air and are unstable to organic solvents, limiting their further applications. [0004] CN113451638A discloses a sulfide solid state electrolyte membrane and a solid lithium ion battery. The sulfide solid state electrolyte membr...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525C04B35/547C04B35/622
CPCH01M10/0562H01M10/0525C04B35/547C04B35/622H01M2300/0068C04B2235/446C04B2235/444C04B2235/658C04B2235/6581C04B2235/656C04B2235/6567Y02E60/10
Inventor 陈少杰刘景超黄海强姚霞银李瑞杰王磊
Owner SVOLT ENERGY TECH (WUXI) CO LTD
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