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Sulfide solid electrolyte material and preparation method thereof

A technology of solid electrolyte and sulfide, which is applied in the direction of cable/conductor manufacturing, circuits, electrical components, etc., and can solve the problems of complicated manufacturing methods, increased costs, and difficulty in industrial scale production

Inactive Publication Date: 2015-11-25
JIANGXI GANFENG BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the ionic conductivity of the sulfide-based dielectric material of the above-mentioned patent is relatively high, the manufacturing method is complicated, which greatly increases the cost, and it is not easy to carry out industrial scale production

Method used

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  • Sulfide solid electrolyte material and preparation method thereof
  • Sulfide solid electrolyte material and preparation method thereof
  • Sulfide solid electrolyte material and preparation method thereof

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preparation example Construction

[0038] The present invention also provides a preparation method of the sulfide solid electrolyte material shown in the above formula (I), comprising the following steps:

[0039] A) will Li 2 S, P 2 S 5 , M 2 S n Mix with an organic solvent to obtain a mixed solution; Li 2 S, P 2 S 5 with M 2 S n The molar ratio of x:y:z;

[0040] B) After the mixed solution is stirred-reacted, centrifuged, filtered and dried in sequence, the initial material is obtained;

[0041] C) heat-treating the initial material to obtain a sulfide solid electrolyte material represented by formula (I);

[0042] wxya 2 S·yP 2 S 5 · zM 2 S n (I);

[0043] Wherein, x+y+z=100%; M is one or more of Al, Ge, Ti and La; n is the valence of M. The x, y, and z are the same as those described above, and will not be repeated here.

[0044] The present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0045] In the process of preparing s...

Embodiment 1

[0057] Under the protection of argon atmosphere and at room temperature, Li with a purity of more than 99% 2 S, P 2 S 5 with GeS 2 After weighing according to the molar ratio of 5:1:1, put it into the reaction vessel under the condition that the water content is less than 100ppm, and then add acetonitrile (AN) according to the mass ratio of 300%. AN needs to be distilled multiple times with a rotary evaporator to make its water content less than 1%. Add AN and mix evenly to obtain the first primary material. After the first primary material is magnetically stirred at room temperature for 24 hours, a suspension with white precipitate is obtained, which is the second primary material; Centrifuge and separate for 10 minutes, then filter and wash at room temperature, repeat this step 3 times to obtain the fourth primary material; put the fourth primary material in an oven, dry at 100°C for 10 hours to obtain a white solid, that is, the fifth primary material; The initial mater...

Embodiment 2

[0065] Under the protection of argon atmosphere and room temperature, Li with a purity of more than 99% 2 S, P 2 S 5 with GeS 2 After weighing according to the molar ratio of 5:1:1, put it into a reaction vessel under the condition that the water content is less than 100ppm, and then add tetrahydrofuran (THF) according to the mass ratio of 300%. THF needs to be distilled multiple times with a rotary evaporator to make its water content less than 1%. After adding the THF solution, the first raw material is obtained, and after magnetically stirring the first raw material at room temperature for 24 hours, a suspension with white precipitate is obtained, which is the second raw material; Centrifuge and separate for 10 minutes, then filter and wash at room temperature, repeat this step 3 times to obtain the fourth primary material; put the fourth primary material in an oven, and dry it at 120°C for 10 hours to obtain a white solid, which is the fifth primary material; Put the f...

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Abstract

The invention provides a sulfide solid electrolyte material and a preparation method thereof. The preparation method comprises the following steps: mixing Li2S, P2S5 and M2Sn with an organic solvent to obtain a suspension liquid; sequentially stirring, dissolving, crystallizing, centrifuging, filtering and drying the suspension liquid; and then carrying out thermal treatment, so as to obtain the sulfide solid electrolyte material. Compared with the prior art, a compound containing Li, P, M and S is formed in an organic solution; the compound and a little of organic solvent form a crystalline state; the residual organic solvent in the suspension liquid is separated and volatilized in the centrifuging, separating and drying processes; meanwhile, most of crystalline-state solvent is also separated and volatilized; and nanopores are left by the residual solvent and the crystalline-state solvent in solid electrolyte in the volatilizing process. Due to the presence of the nanopores, the specific surface area of the sulfide solid electrolyte material is increased; and meanwhile, the material particles are relatively small, and easy to compact, therefore, the ionic conductivity of the sulfide solid electrolyte material is increased.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a sulfide solid electrolyte material and a preparation method thereof. Background technique [0002] Currently, lithium secondary batteries are widely used in daily life and become an indispensable part of society. Lithium secondary batteries have the advantages of large output power, high energy density, long service life, high average output voltage, small self-discharge, no memory effect, fast charge and discharge, excellent cycle performance and no environmental pollution. The preferred object of rechargeable power supply for electronic products is also considered to be the most competitive vehicle power battery. Lithium secondary batteries are classified into liquid lithium secondary batteries and solid lithium secondary batteries. Among them, a solid-state lithium secondary battery refers to a lithium secondary battery in which each unit of the battery inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01B13/00H01B1/06
CPCY02E60/10
Inventor 许晓雄黄冰心黄祯彭刚陈晓添
Owner JIANGXI GANFENG BATTERY TECH
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