Nanometer tin-molybdenum disulfide compound negative electrode material as well as preparation method and application thereof

A technology of molybdenum disulfide and negative electrode material, applied in the direction of negative electrode, active material electrode, battery electrode, etc., to achieve the effect of good cycle stability, high rate discharge capacity and high reversible capacity

Active Publication Date: 2019-04-02
包头市石墨烯材料研究院有限责任公司
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  • Application Information

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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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  • Nanometer tin-molybdenum disulfide compound negative electrode material as well as preparation method and application thereof
  • Nanometer tin-molybdenum disulfide compound negative electrode material as well as preparation method and application thereof
  • Nanometer tin-molybdenum disulfide compound negative electrode material as well as preparation method and application thereof

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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 nanometer tin-molybdenum disulfide compound negative electrode material as well as a preparation method and an application thereof. According to the prepared material, molybdenum disulfide is of a laminated structure, and tin is dispersedly distributed on a molybdenum disulfide sheet in a particle form, wherein the particle size of the tin particles is 8 -15 nm. The preparation method comprises the following steps of dipping molybdenum disulfide by using a SnCl4 solution, and preparing and obtaining the tin-molybdenum disulfide compound negative electrode material trough a hydrogenation reduction method. The layered structure of molybdenum disulfide is utilized, so that the volume change of the tin material in the lithium intercalation process is buffered, a partof internal stress is counteracted, and the cycling stability of a tin-based electrode is improved. The cycling capacity retention rate of the prepared tin-molybdenum disulfide compound electrode is obviously improved compared with that of commercial tin powder, the capacity reduction is relatively small when the large-current discharge is carried out, the platform effect is not obvious, and the capacity loss rate after the rate discharge is ended is low.

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...

Claims

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Application Information

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Patent Type & Authority Applications(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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