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Doped phosphorus-sulfur iodide solid electrolyte and preparation method and application thereof

A solid-state electrolyte and doping technology, which is applied in the manufacture of electrolyte batteries, phosphorus-sulfur/selenium/tellurium phosphorus compounds, electrolytes, etc., can solve problems such as the inability to meet lithium ion transmission, achieve improved ion conductivity, and easy access to raw materials , The effect of simple raw materials

Active Publication Date: 2020-05-01
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this structure, X - (X=Cl, Br, I) and S 2- Different degrees of positional disorder among them will highly affect their ionic conductivity, among which, the I with larger ionic radius - with S 2- There is almost no positional disorder among them, so compared to Li 6 P.S. 5 Cl and Li 6 P.S. 5 Br10 -3 Ionic conductivity on the order of S / cm, Li 6 P.S. 5 The conductivity of I is only 10 -8 -10 -7 Level, unable to meet the needs of lithium ion transmission

Method used

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  • Doped phosphorus-sulfur iodide solid electrolyte and preparation method and application thereof
  • Doped phosphorus-sulfur iodide solid electrolyte and preparation method and application thereof
  • Doped phosphorus-sulfur iodide solid electrolyte and preparation method and application thereof

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Embodiment 1

[0064] This embodiment provides a method for preparing a doped phosphorus-sulfur-iodide solid-state electrolyte, comprising the following steps:

[0065] (1) Weigh 0.478g, 0.500g, 0.670g, 0.092g and 0.048g of lithium sulfide, phosphorus pentasulfide, lithium iodide, tungsten powder and sulfur powder according to the molar ratio of 2.45:0.45:1:0.1:0.3 respectively, Ball milling in a ball mill tank protected by an air atmosphere, using 20 zirconia ball milling beads with a diameter of 12 mm, the ball milling speed is 350 rpm, the ball milling time is 18 hours, and the ball mill is cooled for 10 minutes every 30 minutes to obtain a solid electrolyte precursor;

[0066](2) Under an argon atmosphere, transfer the solid electrolyte precursor from the ball mill tank to a quartz tube, and then put it into a tube furnace for sintering. The heating rate is 2°C / min, and the sintering temperature is 550°C. After holding for 5 hours After natural cooling, it is ground into powder to obtain...

Embodiment 2

[0069] This embodiment provides a method for preparing a doped phosphorus-sulfur-iodide solid-state electrolyte, comprising the following steps:

[0070] (1) Weigh 0.468g, 50.444g, 0.670g, 0.184g and 0.096g of lithium sulfide, phosphorus pentasulfide, lithium iodide, tungsten powder and sulfur powder according to the molar ratio of 2.4:0.4:1:0.2:0.6 respectively, Ball milling in a ball mill tank protected by an air atmosphere, using 20 zirconia ball milling beads with a diameter of 12 mm, the ball milling speed is 400 rpm, the ball milling time is 15 hours, and the ball mill is cooled for 6 minutes every 35 minutes to obtain a solid electrolyte precursor;

[0071] (2) Under an argon atmosphere, transfer the solid electrolyte precursor from the ball mill tank to a quartz tube, and then put it into a tube furnace for sintering. The heating rate is 1°C / min, and the sintering temperature is 550°C. After holding for 5 hours After natural cooling, it is ground into powder to obtain ...

Embodiment 3

[0074] This embodiment provides a method for preparing a doped phosphorus-sulfur-iodide solid-state electrolyte, comprising the following steps:

[0075] (1) Lithium sulfide, phosphorus pentasulfide, lithium iodide, tungsten disulfide and sulfur powder are respectively weighed 0.458g, 50.3885g, 0.670g, 20.372g and 0.048g according to the molar ratio of 2.35:0.35:1:0.3:0.9, in Ball milling in a ball mill tank protected by an argon atmosphere, using 18 zirconia ball milling beads with a diameter of 12mm, the ball milling speed is 350rpm, the ball milling time is 18h, and the ball mill is cooled for 10 minutes every 30 minutes to obtain a solid electrolyte precursor;

[0076] (2) Under an argon atmosphere, transfer the solid electrolyte precursor from the ball mill tank to a quartz tube, and then put it into a tube furnace for sintering. The heating rate is 2°C / min, and the sintering temperature is 550°C. After holding for 2 hours After natural cooling, it is ground into powder t...

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Abstract

The invention relates to a doped phosphorus-sulfur iodide solid electrolyte and a preparation method and an application thereof. A general chemical formula of the solid electrolyte is Li<6-x>M<x>P<1-x>S<5>I, x is larger than 0 and smaller than 0.8, and M is tungsten and / or molybdenum. The method comprises steps of 1) mixing a lithium source, a phosphorus source, an iodine source, a sulfur source and an M source in an inert atmosphere, and performing ball milling to obtain a solid electrolyte precursor; and 2) sintering the solid electrolyte precursor obtained in the step 1) in the inert atmosphere or in vacuum to obtain the doped phosphorus-sulfur iodide solid electrolyte. The ionic conductivity of the solid electrolyte can reach 1.0*10<-3>S / cm or above, and an electrochemical stability window is wide; the preparation method is simple, the raw materials are easily available, the synthesis process is simple, and the synthesized electrolyte crystal structure is good; an all-solid-state battery assembled by the material has advantages of high energy density, good cycling stability and wide application prospect.

Description

technical field [0001] The invention relates to the technical field of solid-state electrolytes, in particular to a doped phosphorus-sulfur-iodide solid-state electrolyte and its preparation method and application. Background technique [0002] As a green and clean energy storage device, lithium-ion batteries are currently mainly marketed in the fields of mobile phones, digital cameras, and notebook computers. With the rapid development of science and technology, especially the rapid growth of the new energy automobile industry in recent years, the various requirements for lithium-ion batteries are getting higher and higher. In addition to high safety performance and high energy density, it must also have long service life and power. Features high density. However, when the traditional organic electrolyte is used in the battery, it may overheat due to battery overcharging, short circuit and other problems, which may cause safety hazards; therefore, the conductivity is compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M10/058
CPCH01M10/0562H01M10/0525H01M10/058H01M2300/008Y02E60/10Y02P70/50C01B17/22C01B25/14H01M4/139H01M4/366H01M4/62H01M10/0585H01B1/06H01M10/052C01P2002/52C01P2002/72C01P2006/40
Inventor 王国光石程王占洲蒋易晟夏阳张俊
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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