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Sulfide solid electrolyte, preparation method thereof and lithium ion battery

A solid electrolyte and sulfide technology, applied in the field of lithium ion batteries, can solve the problems of low ionic conductivity, poor stability of air and organic solvents, etc., and achieve the effects of simple preparation process, high stability and excellent lithium ion conductivity

Pending Publication Date: 2021-11-16
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a kind of sulfide solid electrolyte and preparation method thereof, lithium ion battery, to solve the problem of low ion conductivity and poor stability to air and organic solvents of sulfide solid electrolyte in the prior art question

Method used

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  • Sulfide solid electrolyte, preparation method thereof and lithium ion battery
  • Sulfide solid electrolyte, preparation method thereof and lithium ion battery
  • Sulfide solid electrolyte, preparation method thereof and lithium ion battery

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preparation example Construction

[0026] In another typical implementation of the present application, a method for preparing the aforementioned sulfide solid electrolyte is provided, the preparation method comprising: step S1, weighing Li source, S source, Sb source, I source, optional Si source, and mechanically grind the raw materials comprising Li source, S source, Sb source, I source, and optional Si source to obtain the first mixture; Step S2, in nitrogen , vacuum or inert gas atmosphere, the first mixture is sintered to obtain a sulfide solid electrolyte.

[0027] The first mixture obtained by mechanical grinding is more uniform, and diffusion is formed between the elements; the mixture is sintered in nitrogen, vacuum or inert gas atmosphere to make the binding energy of each element higher, and the structure of the obtained sulfide solid electrolyte It is more stable, and the above-mentioned sulfide solid electrolyte has better lithium ion conductivity at room temperature and higher stability to air an...

Embodiment 1

[0040] Will Li 2 S, SiS 2 , Sb 2 S 5 The raw materials of LiI are added to the high-energy ball mill according to the molar ratio of 14:3:1:5, and zirconia balls are added at the same time. The mass ratio of zirconia balls to raw materials is 10:1, and the milling speed is 300r / min. 24 hours of high-energy ball milling to obtain the first mixture. Then add sublimed sulfur powder to the first mixture according to the mass ratio of sublimated sulfur to the first mixture of 1:99 and perform high-energy ball milling again at a high-energy ball milling speed of 300r / min for 2h to obtain the second mixture. Then, the second mixture was sintered at 550° C. for 12 h under an argon atmosphere to obtain a sulfide solid electrolyte. Among them, the room temperature AC test impedance diagram of the sulfide solid electrolyte is shown in figure 1 , the corresponding relationship between the impedance of the sulfide solid electrolyte and its thickness and area is shown in Table 1.

[0...

Embodiment 2

[0044] Will Li 2 S, SiS 2 , Sb 2 S 5 The raw materials of LiI are added to the high-energy ball mill according to the molar ratio of 11:2:1:4, and zirconia grinding balls are added at the same time. The mass ratio of zirconia grinding balls to raw materials is 20:1, and the high-energy ball milling speed is 550r / min. 12 hours of high-energy ball milling to obtain the first mixture. Then, according to the mass ratio of iodine to the first mixture of 2:98, iodine tablets were added to the first mixture and high-energy ball milling was performed again, and the high-energy ball milling was performed at a high-energy ball milling speed of 300r / min for 2h to obtain the second mixture. Then, the second mixture was sintered at 450° C. for 6 h under vacuum to obtain a sulfide solid electrolyte.

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Abstract

The invention provides a sulfide solid electrolyte, a preparation method thereof and a lithium ion battery. The sulfide solid electrolyte has a general chemical formula of Li 6 + x Si x Sb 1-x S5I, wherein x is more than or equal to 0 and less than 1. The sulfide solid electrolyte has excellent lithium ion conductivity at room temperature and relatively high stability to air and organic solvents through a synergistic effect among the elements, the lithium ion conductivity can reach 10 <-4 >-10 <-2 > S.cm <-1 >, the reduction of the ion conductivity is less than or equal to 40% when the electrolyte is exposed for 4 hours at the dew point of a drying room at-40 DEG C, after the sulfide solid electrolyte is soaked in an organic solvent for 2 hours at room temperature and 80 DEG C, the ionic conductivity is reduced by less than or equal to 30%; and thus, an all-solid-state battery comprising the sulfide solid electrolyte has excellent electrochemical performance and safety performance; and the preparation process of the sulfide solid electrolyte is simple, adopt extensive and easily available raw materials and is relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a sulfide solid electrolyte, a preparation method thereof, and a lithium ion battery. Background technique [0002] Commercial lithium-ion batteries have been widely used in transportation, communications, portable electronic products and power tools, and are gradually developing into the field of large-scale energy storage. However, the organic electrolyte used in the current commercial lithium-ion batteries is easy to leak, easy to burn and explode, which brings great safety hazards. The all-solid-state battery that replaces the traditional organic liquid electrolyte with a safe inorganic solid electrolyte is one of the effective ways to solve the safety problem of lithium-ion batteries. At the same time, the solid electrolyte can replace the separator in the lithium battery, which can further simplify the structure of the battery, facilitate its production and u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M2300/0068Y02E60/10
Inventor 陈少杰姚霞银黄海强王磊李瑞杰曹晓菊
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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