Solid electrolyte material for lithium battery and preparation method of solid electrolyte material

A solid electrolyte, lithium battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as lithium metal instability, to improve stability, overcome stability and high ion conductivity, increase kinetics Effect

Pending Publication Date: 2022-08-05
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Li has been reported in the literature 5.3 P.S. 4.3 ClBr 0.7 (5.2mS cm -1 ), Li 5.5 P.S. 4.5 Cl 1.5 (7.2mS cm -1 ) Although sulfide electrolytes with argentite crystal structure have high room temperature ionic conductivity, such materials are unstable to lithium metal; the newly reported Li 5.6 P.S. 4.6 I 1.4 Although the ionic conductivity at room temperature is relatively low (2.4mS cm -1 ), but stable to lithium metal

Method used

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  • Solid electrolyte material for lithium battery and preparation method of solid electrolyte material
  • Solid electrolyte material for lithium battery and preparation method of solid electrolyte material
  • Solid electrolyte material for lithium battery and preparation method of solid electrolyte material

Examples

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preparation example Construction

[0028] This embodiment also provides a method for preparing the solid electrolyte as described above, comprising: according to chemical formula (1) Li 5+x PS 4+x Cl 2-x-y-z Br y I z mixing a lithium source compound, a phosphorus source compound, a chlorine-containing compound, a bromine-containing compound, and an iodine-containing compound in a stoichiometric ratio to form a raw material mixture;

[0029] The raw material mixture is heat treated in an inert atmosphere or hydrogen sulfide atmosphere or under vacuum, and the heat treatment temperature is 350-570°C, most preferably 380-520°C. The compound for solid electrolyte has the advantages of high ionic conductivity and low production cost.

Embodiment approach

[0030] As an embodiment, the lithium source compound includes one or more of lithium sulfide, lithium polysulfide, lithium phosphide, lithium carbonate, and lithium metal element, preferably lithium sulfide.

[0031] As an embodiment, the phosphorus source compound includes at least one of phosphorus pentasulfide, phosphorus trisulfide, and elemental phosphorus, preferably phosphorus pentasulfide.

[0032] As an embodiment, the chlorine-containing compound includes PCl 3 , PCl 5 , P 2 Cl 4 , SCl 2 , S 2 Cl 2 At least one of them, preferably lithium chloride.

[0033] According to an embodiment of the present invention, the bromine-containing compound includes LiBr, PBr 3 , S 2 Br 2 At least one of them, preferably lithium bromide.

[0034] According to an embodiment of the present invention, the iodine-containing compound includes LiI, PI 3 , S 2 I 2 At least one of at least one, preferably lithium iodide.

[0035] In the present invention, through the co-doping ...

Embodiment 1

[0049] This example is Li 5.5 PS 4.5 Cl 0.8 Br 0.69 I 0.01 Electrolyte, the specific steps are as follows:

[0050] (1) Under the condition that the argon atmosphere, the water pressure and the oxygen partial pressure are all less than 1 ppm, the Li 2 S (Alfa 99.9%), P 2 S 5 (Alfa 99.9%), LiCl (Alfa 99.9%), LiBr (Alfa 99.9%), LiI (Alfa 99.9%) were weighed according to the molar ratio of 4:1:1.6:1.38:0.02, and mixed by low-speed ball milling at 100rpm for 1h to obtain mixture;

[0051] (2) The above mixture was then heat-treated at 520 °C for 10 h to obtain Li 5.5 PS 4.5 Cl 0.8 Br 0.69 I 0.01 electrolyte.

[0052] figure 1 SEM image of the prepared electrolyte powder. figure 2 Schematic diagram of solid electrolyte X-ray diffraction. The sulfide solid electrolyte powder prepared in this example has a characteristic peak between 17.4 and 17.9 degrees in the XRD diffraction pattern, and one characteristic peak between 25.0 and 25.4 degrees, and a characteristic p...

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Abstract

The invention provides a solid electrolyte for a lithium battery, the solid electrolyte comprises a sulfide with a cubic system argyrodite type crystal structure, and the sulfide has the following molecular formula: Li < 5 + x > PS < 4 + x > Cl < 2-x-y-z > Br < y > I < z >, wherein x, y and z satisfy 0 < x < 1, 0 < y < 1, 0.09 < z < = 0.11, x + y + z = 2, and the ratio (y/x) of the molar ratio of Br to the molar ratio of Cl is 0.02-8, and the solid electrolyte has high ionic conductivity and extremely high stability to lithium metal.

Description

technical field [0001] The invention belongs to the field of secondary lithium ion batteries, in particular to the field of all solid state batteries, and particularly relates to a solid electrolyte material for lithium ion batteries and a preparation method thereof. Background technique [0002] Compared with lead-acid and nickel-cadmium batteries, lithium-ion batteries have higher energy density, so they are widely used in portable electronic devices, such as mobile phones, cameras, notebook computers and other electronic products, as well as new energy electric vehicles and other fields. Most commercial lithium-ion batteries use organic, flammable liquid electrolytes, which are easy to burn and explode, thus posing safety hazards. When matched with a high-nickel ternary cathode, the oxidation of the electrolyte and the dissolution of transition metal ions also shorten the battery life. During cycling at high current density, Li dendrites tend to grow, pierce the separato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/10C01B25/14H01M10/0562H01M10/0525
CPCC01B25/10C01B25/14H01M10/0562H01M10/0525H01M2300/0068C01P2002/72C01P2006/40Y02P70/50
Inventor 王硕冯玉川李峥何泓材
Owner WUHAN UNIV OF TECH
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