A kind of nano tin-molybdenum disulfide composite negative electrode material and its preparation method and application

A technology of molybdenum disulfide and negative electrode materials, applied in the direction of negative electrodes, active material electrodes, battery electrodes, etc., to achieve the effects of small capacity loss rate, improved cycle stability, and high energy density

Active Publication Date: 2022-05-20
包头市石墨烯材料研究院有限责任公司
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Problems solved by technology

[0004] Purpose of the invention: In view of the volume expansion problem of Sn-based in the prior art, to further improve the cycle stability of Sn-based electrodes, the present invention provides a nano-tin-molybdenum disulfide composite negative electrode material and its preparation method and application

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  • A kind of nano tin-molybdenum disulfide composite negative electrode material and its preparation method and application
  • A kind of nano tin-molybdenum disulfide composite negative electrode material and its preparation method and application
  • A kind of nano tin-molybdenum disulfide composite negative electrode material and its preparation method and application

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Embodiment 1

[0025] 1, the preparation method of tin-molybdenum disulfide compound is as follows:

[0026] The volume ratio of ethanol: deionized water is 1:3 to prepare the mixed solution, then add SnCl 4 -5H 2 O solid, made into SnCl with a concentration of 100g / L 4 -5H 2 O solution. Pour 30 mg molybdenum disulfide into SnCl 4 -5H 2 O solution, ultrasonic vibration for 30min, the total concentration of molybdenum disulfide in the total system is 30g / L. Then put it into a vacuum drying oven after suction filtration, and dry it at 100°C for 1 to 10 hours to obtain SnCl 4 Impregnated molybdenum disulfide composite.

[0027] The resulting SnCl 4 The impregnated molybdenum disulfide composite was put into a tubular calciner for hydrogen reduction, and the temperature was raised to 350°C at 5°C / min, and kept for 1 hour. During the hydrogen reduction process, 20 sccm of H was introduced throughout the process. 2 And 10sccm of Ar mixed gas, cooled to room temperature with the furnace, ...

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Abstract

The invention discloses a nano tin-molybdenum disulfide composite negative electrode material, a preparation method and an application thereof. In the material prepared by the invention, the molybdenum disulfide has a lamellar structure, and the tin is dispersed and distributed on the molybdenum disulfide sheet in the form of particles, and the particle diameter of the tin particles is 8-15nm. The preparation method includes: using SnCl 4 After impregnating the molybdenum disulfide with the solution, the tin-molybdenum disulfide composite negative electrode material is prepared by hydrogenation reduction. The invention utilizes the layered structure of the molybdenum disulfide to buffer the volume change of the tin material during the lithium intercalation process, offset part of the internal stress, and improve the cycle stability of the tin-based electrode. Compared with commercial tin powder, the cycle capacity retention rate of the tin-molybdenum disulfide composite electrode prepared in the present invention is significantly improved, and the capacity drop is small during high-current discharge, the plateau effect is not obvious, and the capacity loss rate is small after rate discharge. .

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a high-capacity, long-life and low-cost nanometer tin-molybdenum disulfide composite electrode material and its preparation method and application. Background technique [0002] The superior performance of lithium-ion batteries makes them have broad application prospects in portable electronic devices, electric vehicles, and aerospace. [0003] At present, the commercial negative electrode materials are still mainly graphite carbon-based carbon materials, and their maximum theoretical specific capacity is only 372mAh / g, which restricts the further improvement of lithium battery capacity. Tin is considered as the most promising electrode material with a theoretical capacity as high as 994mAh / g (Li 4.4 Sn alloy), which is about three times the theoretical specific capacity of carbon anode materials, and using it as the anode of lithium-ion batteries can greatly increas...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M10/0525
CPCH01M4/366H01M4/387H01M4/485H01M10/0525H01M2004/027Y02E60/10
Inventor 马志鸿耿海龙胡博王宝英曲翊
Owner 包头市石墨烯材料研究院有限责任公司
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