Sulfide solid-state electrolyte modified by oxide and preparation method of sulfide solid-state electrolyte

A solid electrolyte and oxide technology, which is applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of high preparation temperature, low room temperature ionic conductivity of the electrolyte, and large energy consumption, so as to facilitate mass production , reduce release, reduce pollution effect

Inactive Publication Date: 2018-05-18
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These pairs of β-phase Li 3 P.S. 4 The modification uses ball milling and melting-cooling-recrystallization, the preparation temperature is high, the energy consumption is large, and the ion conductivity of the prepared electrolyte at room temperature is low

Method used

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  • Sulfide solid-state electrolyte modified by oxide and preparation method of sulfide solid-state electrolyte
  • Sulfide solid-state electrolyte modified by oxide and preparation method of sulfide solid-state electrolyte
  • Sulfide solid-state electrolyte modified by oxide and preparation method of sulfide solid-state electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In a glove box filled with inert gas, the Li 2 S, P 2 S 5 and Li 3 PO 4 The three kinds of powders are mixed in the ratio of 117:39:2 according to the amount of substance, and the total weight is 3 grams with a balance, and the target product component is Li 3 P.S. 3.9 o 0.1 , put into a centrifuge test tube, add tetrahydrofuran, and fully mix for 10 hours at room temperature with a magnetic stirring speed of 500 rpm, and the mixed solution is yellow-green;

[0033] Centrifuge the mixture for 20 minutes at a speed of 3000 rpm, then put the centrifuge tube into a glove box filled with inert gas, pour out the supernatant, add an appropriate amount of tetrahydrofuran solvent and centrifuge again; repeat the centrifugation 3 times, Until the supernatant changed from dark yellow-green to slightly yellow-green transparent.

[0034] In a glove box filled with inert gas, a vacuum pump is connected to the centrifuge tube to pre-evacuate the residual solvent and volatile p...

Embodiment 2

[0039] In a glove box filled with inert gas, the Li 2 S, P 2 S 5 and P 2 o 5 Three kinds of powders are mixed as 15:10:4 according to the ratio of the amount of substance, and it is 50 grams to weigh total weight with balance, and target product component is Li 3 P.S. 2 o 2 , put into a centrifuge test tube, add N-methylformamide, and use a magnetic stirrer with a rotation speed of 1000 rpm at room temperature to fully mix for 24 hours, and the mixed solution is yellow-green;

[0040] Centrifuge the mixture for 60 minutes at a speed of 5000 rpm, then put the centrifuge tube into a glove box filled with inert gas, pour out the supernatant, add an appropriate amount of N-methylformamide and centrifuge again; perform centrifugation repeatedly Operate 5 times until the supernatant turns from dark yellow-green to slightly yellow-green transparent.

[0041] In a glove box filled with inert gas, a vacuum pump is connected to the centrifuge tube, and the residual solvent and ga...

Embodiment 3

[0046] In a glove box filled with inert gas, the Li 2 S, P 2 S 5 and Li 2 O and P 2 o 5 Four powders (Li 2 O and P 2 o 5 That is, the combination of oxides to the solid-state electrolytic modification of sulfides) is mixed in a ratio of 6:23:15:2 according to the amount of substances, and the total weight is 49 grams with a balance, and the target product component is Li 3 P.S. 3.5 o 0.5 , put into a centrifuge test tube, add tetrahydrofuran solvent, and mix thoroughly with magnetic stirring at room temperature for 24 hours, the mixture is yellow-green;

[0047] Centrifuge the mixed solution for 60 minutes at a speed of 4000 rpm, then put the centrifuge tube into a glove box filled with inert gas, pour out the supernatant, add an appropriate amount of tetrahydrofuran solvent and centrifuge again; repeat the centrifugation 5 times, Until the supernatant changed from dark yellow-green to a slightly yellow-green transparent color.

[0048] In a glove box filled with in...

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Abstract

The invention relates to the technical field of a lithium ion battery, and relates to a sulfide solid-state electrolyte modified by an oxide and a preparation method of the sulfide solid-state electrolyte. The invention provides the sulfide solid-state electrolyte Li3PS4-xOx by which Beta-phase Li3PS4 is modified by an oxide comprising one or more of lithium-oxygen, phosphorus-oxygen and lithium-phosphorus-oxygen, x is more than 0 but less than 4, and an organic liquid-state solvent dispersion method of the oxide-modified sulfide solid-state electrolyte which is efficiently prepared at a low temperature. With a nanometer structure formed by oxide modification and organic liquid-state solvent dispersion, the room-temperature and high-conductivity Beta-phase Li3PS4 is stabilized, the room-temperature ion conductivity of the electrolyte is improved, the air stability of the electrolyte is remarkably improved, and the evolution of H2S gas is reduced. The preparation method of the sulfide solid-state electrolyte material, provided by the invention is simple and is easy to operate.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and relates to a sulfide solid electrolyte modified by oxides and a preparation method thereof. Background technique [0002] With the rapid development of portable electronic devices such as mobile communications, electronic instruments and electric tools, and the improvement of people's awareness of energy conservation and environmental protection, batteries that can be recharged and discharged many times have been widely used. Among them, lithium-ion batteries that appeared in the 1990s are currently the The world-recognized next-generation chemical power supply has been successfully commercialized and rapidly developed in the field of portable devices. However, the current commercialized lithium-ion batteries are limited by their theoretical capacity, and cannot further significantly improve their energy density and cycle life, which is far from meeting the needs of technologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562
CPCH01M10/0562H01M2300/0085Y02E60/10
Inventor 张晓锋刘伟明颜悦陈牧
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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