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Sulfur-based positive electrode material of all-solid-state battery and preparation method of sulfur-based positive electrode material

A technology for all-solid-state batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as poor interface contact and low electronic conductivity, and achieve improved diffusion kinetics, simple preparation methods, and low cost. low effect

Pending Publication Date: 2022-05-17
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low electronic conductivity of solid sulfur and poor interface contact between the active material and solid electrolyte inside the positive electrode of the all-solid-state battery, the present invention provides a sulfur-based positive electrode material for an all-solid-state battery and a preparation method thereof

Method used

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  • Sulfur-based positive electrode material of all-solid-state battery and preparation method of sulfur-based positive electrode material
  • Sulfur-based positive electrode material of all-solid-state battery and preparation method of sulfur-based positive electrode material
  • Sulfur-based positive electrode material of all-solid-state battery and preparation method of sulfur-based positive electrode material

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Embodiment 1

[0037] (1) Weigh 2g of polystyrene balls and add them into 60mL of nitric acid / sulfuric acid mixed solution for dispersion treatment. After centrifugal filtration, the precipitate and 2.5g of Na 2 S 2 o 4 Add 50ml of 2M NaOH solution for amination treatment. Wherein, the nitric acid / sulfuric acid mixed solution is obtained by mixing a nitric acid solution with a concentration of 2 mol / L and a sulfuric acid solution with a concentration of 2 mol / L at a volume ratio of 3:1.

[0038] (2) Mix elemental titanium, elemental aluminum, and titanium carbide at a molar ratio of 0.9:1:2.1, ball mill for 6 hours at a speed of 100r / min, and sinter the mixture at 1350°C under the protection of an argon atmosphere.

[0039] (3) Add the product obtained in step (2) into a solution formed by 1 g of lithium fluoride and 10 mL of 7M hydrochloric acid for chemical etching treatment, and react at 40° C. for 24 h.

[0040] (4) 350 mg of polystyrene spheres with a radius of 1 μm and amination tre...

Embodiment 2

[0048] (1) Weigh 3g of polystyrene balls and add them into 80mL of nitric acid / sulfuric acid mixed solution for dispersion treatment. After centrifugal filtration, the precipitate and 3.7g of Na 2 S 2 o 4 Add 70ml of 2M NaOH solution for amination treatment.

[0049] (2) Mix elemental titanium, elemental aluminum, and titanium carbide at a molar ratio of 0.9:1:2.1, ball mill for 6 hours at a speed of 200r / min, and sinter the mixture at 1400°C under the protection of an argon atmosphere.

[0050] (3) Add the product of step (2) into a solution formed by 1 g of lithium fluoride and 10 mL of 9M hydrochloric acid for chemical etching treatment, and react at 50° C. for 24 h.

[0051] (4) 250 mg of polystyrene spheres with a radius of 750 μm and amination treatment in step (1) and 50 mg of MXene nanosheets obtained in step (3) were sequentially added to deionized water to obtain a mixed solution.

[0052] (5) Adjust the pH value of the mixed solution obtained in step (4) to 4, an...

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Abstract

The invention discloses a sulfur-based positive electrode material of an all-solid-state battery and a preparation method of the sulfur-based positive electrode material, and belongs to the technical field of lithium ion batteries. According to the invention, the problems of low electronic conductivity of the existing solid sulfur and poor interface contact between the active substance in the positive electrode of the all-solid-state battery and the solid electrolyte are solved. The positive electrode material provided by the invention has a core-shell structure, the core-shell structure comprises an internal round core and an external shell layer, the internal round core is elemental sulfur, the external shell layer is Mxene with a chemical expression of Ti3C2Tx, and T is OH, Cl or F. The positive electrode material provided by the invention has good electronic conductivity and ionic conductivity, abundant functional groups on the surface of the shell layer can effectively enhance the adsorption and bonding effects between the positive electrode material and a solid electrolyte, good ion / electron dual channels can be formed in a positive electrode, and the electrochemical performance of a solid-state battery is improved. In addition, the positive electrode material provided by the invention is simple in preparation method, wide in raw material source and low in cost.

Description

technical field [0001] The invention relates to a sulfur-based cathode material for an all-solid-state battery and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] At present, commercialized lithium-ion batteries are mainly liquid lithium-ion batteries using organic electrolytes. This kind of battery has problems such as gas swelling, liquid leakage, and battery spontaneous combustion and explosion caused by lithium dendrites piercing through the diaphragm, thus restricting the development of lithium-ion batteries. Ion battery development. [0003] All-solid-state batteries are a new type of high-safety batteries that use solid-state electrolytes instead of traditional organic liquid electrolytes. They can not only fundamentally solve the safety problems of traditional liquid-state batteries, but also solid-state electrolytes have better mechanical properties and can be used to a greater extent. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 乔英杰张晓红王晓东王家钧谢颖周实
Owner HARBIN ENG UNIV
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