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Sulfide solid electrolyte and preparation method and application thereof

A technology of sulfide electrolyte and solid electrolyte, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., and can solve problems such as potential safety hazards

Pending Publication Date: 2022-04-29
SVOLT ENERGY TECH (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recent frequent occurrence of new energy vehicle safety accidents is mainly due to the fact that traditional lithium-ion batteries need to use flammable organic solvents as electrolytes, so there are great potential safety hazards, and traditional improvement methods cannot completely solve this problem

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
Comparison scheme
Effect test

Embodiment 1

[0050] Li 6.9 P.S. 5.9 Cl 0.1 -0.375Sr[Li 2 Al 2 o 2 N 2 ] Electrolyte preparation: take by weighing 3.4mol Li by molar ratio 2 S, 0.5mol P 2 S 5 , 0.1mol LiCl and 0.375mol Sr[Li 2 Al 2 o 2 N2 ] placed in a ball mill jar, sealed and ball milled for mixing, the ball to material ratio was 20:1, the ball mill speed was 660rpm, the ball mill time was 25h, and the precursor was obtained after ball milling. Under the protection of argon atmosphere, the precursor was subjected to high-temperature heat treatment in a muffle furnace. The heat treatment temperature was 500 °C, the temperature rise rate was 2 °C / min, and the holding time was 10 h. After natural cooling, the crude electrolyte product was obtained. After grinding and sieving, a sulfide solid electrolyte is obtained.

[0051] Performance Testing:

[0052] Voltage window test: under the protection of argon atmosphere, the Li 6.9 P.S. 5.9 Cl 0.1 -0.375Sr[Li 2 al 2 o 2 N 2 ] The electrolyte and the conducti...

Embodiment 2

[0058] The difference from Example 1 is that when preparing a sulfide solid electrolyte, 3.3mol Li was weighed in molar ratio 2 S, 0.5mol P 2 S 5 , 0.2mol LiCl and 0.35mol Sr[Li 2 al 2 o 2 N 2 ].

Embodiment 3

[0060] The difference from Example 1 is that when preparing a sulfide solid electrolyte, 3.2mol Li is weighed in molar ratio 2 S, 0.5mol P 2 S 5 , 0.3mol LiCl and 0.325mol Sr[Li 2 al 2 o 2 N 2 ].

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Abstract

The invention discloses a sulfide solid electrolyte and a preparation method and application thereof. According to the sulfide solid electrolyte, a sulfide electrolyte is doped with a nitrogen element and an oxygen element at the same time, the sulfide electrolyte comprises a lithium-phosphorus-sulfur type electrolyte, and the molar ratio of the total doping amount of the nitrogen element and the oxygen element to the phosphorus element is not smaller than 0.2. Therefore, the sulfide solid electrolyte not only has high ionic conductivity and high air stability, but also is high in energy density, relatively good in chemical stability and cycling stability, relatively low in preparation environment and condition requirements, and suitable for large-scale production; and the electrochemical window, the electrochemical performance, the energy density, the safety, the service life and other comprehensive performance of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a sulfide solid electrolyte and a preparation method and application thereof. Background technique [0002] Since the introduction of lithium-ion batteries, they have been widely used in various portable electronic products (such as notebook computers, mobile phones and digital cameras) and electric vehicles. However, recent frequent safety accidents of new energy vehicles are mainly due to the fact that traditional lithium-ion batteries need to use flammable organic solvents as electrolytes, so there are great potential safety hazards, and traditional improvement methods cannot completely solve this problem. In comparison, solid-state lithium-ion batteries using solid-state electrolytes have a safety advantage. Solid electrolytes can not only fundamentally solve the safety problem of lithium-ion batteries, but also are expected to greatly simplify the manufacturing and packag...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0562H01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 刘景超陈少杰周宇楠杨红新
Owner SVOLT ENERGY TECH (WUXI) CO LTD
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