Molybdenum disulfide-coated carbon nanofiber used as negative electrode material for lithium-ion battery and preparation method of molybdenum disulfide-coated carbon nanofiber

Abstract

The invention discloses a molybdenum disulfide-coated carbon nanofiber used as a negative electrode material for a lithium-ion battery and a preparation method of the molybdenum disulfide-coated carbon nanofiber. The molybdenum disulfide-coated carbon nanofiber is characterized in that the outer surface of a mesoporous carbon nanofiber is coated with a layer of molybdenum disulfide nanosheet; andduring preparation, a nanofiber containing ZIF-8 is firstly prepared by using an electrostatic spinning assembly method, a porous carbon nanofiber is formed after high-temperature carbonization of thefiber, and the surface of the carbon nanofiber is coated with a layer of flaky molybdenum disulfide through a hydrothermal method, thereby obtaining a target product used as a negative electrode material for a lithium-ion battery. The molybdenum disulfide-coated carbon nanofiber is the negative electrode material for the lithium-ion battery capable of being charged and discharged, the problems ofpoor stability and poor conductivity of the flaky molybdenum disulfide material in charging and discharging processes of the battery are effectively solved, the cycle performance and the rate capability of the battery are improved and the electron transport rate in the cycle process of the battery is improved; and the preparation method is simple, massive production can be achieved and the preparation method has a good application prospect.

Description

technical field [0001] The invention relates to a rechargeable and dischargeable lithium ion battery negative electrode material and a preparation method thereof, belonging to the field of electrochemical power sources. Background technique [0002] Facing the current increasingly pressing energy and environmental issues, the development of efficient and stable lithium secondary batteries has become a top priority. Lithium-ion batteries have the characteristics of high energy density, long cycle life, and environmental friendliness (Energy Environ. Sci., 2014, 7, 3320–3325), and are widely used in portable electronic products and power or energy storage batteries and other fields. At present, graphite anode materials for commercial lithium-ion batteries have low specific capacity and poor rate performance, and the theoretical specific capacity of commercial carbon is 372 mAh g -1 (Journal of Alloys and Compounds 673 (2016) 215-219), and there is a large safety hazard, so th...

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Problems solved by technology

[0005] In order to avoid the shortcomings of the above-mentioned prior art, the present invention provides a molybdenum disulfide-coated carbon nanofiber used as a negative electrode material for a lithium-ion battery and a preparation method thereof, aiming at solving the problems of the existing molybdenum disulfide Poor conductivity and volume expansion during battery charging and discharging to improve the cycle performance and rate performance of the battery and improve stability

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