Preparation method of three-dimensional MoS2@C composite porous fiber for lithium ion capacitor negative electrode material

Abstract

The invention relates to a preparation method of three-dimensional MoS2@C composite porous fiber for a lithium ion capacitor negative electrode material. The method comprises the following steps of (1) preparation of a reaction liquid, wherein through stirring, ultrasonic treatment and other modes, a three-dimensional porous carbon nanofiber matrix material is uniformly dispersed in distilled water, and a certain amount of ammonium molybdate and thiourea are added in proportion to prepare the reaction liquid; (2) hydro-thermal synthesis of the three-dimensional MoS2@C composite porous fiber, wherein the reaction liquid is transferred into a hydrothermal reaction kettle, the ammonium molybdate and the thiourea react to generate MoS2 with a flaky nano-flower ball structure, the MoS2 is uniformly filled and grows on a three-dimensional porous carbon nanofiber framework, and after repeated washing, absolute ethyl alcohol washing, suction filtration and vacuum drying are carried out, the three-dimensional MoS2@C composite porous fiber is obtained. The preparation method of the three-dimensional MoS2@C composite porous fiber for the lithium ion capacitor negative electrode material has the advantages that the three-dimensional porous carbon nanofiber framework effectively improves the electrical conductivity of the MoS2, the structural collapse caused by volume expansion in the cyclic process of the MoS2 is avoided, the preparation method is simple and convenient in operation, the controllability and repeatability are good, and the scale production is easy.

Description

technical field [0001] The invention relates to a three-dimensional MoS used as a lithium ion capacitor negative electrode material 2 The preparation method of @C composite porous fibers, especially to provide a simple, environmentally friendly and mass-producible MoS with sheet-like nano-curdling structure grown on a three-dimensional carbon nanofiber matrix with a through-hole structure 2 The preparation method, and the prepared composite fiber has the advantages of three-dimensional structure, large specific surface area, strong bonding ability between materials, and good stability. technical background [0002] Global warming and the increasing depletion of fossil fuels are forcing people to vigorously develop sustainable and renewable energy sources. As the most promising energy sources, solar energy and wind energy have attracted widespread attention. However, solar energy cannot work at night, and wind energy is also uncertain, so electrochemical energy storage devic...

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Problems solved by technology

Many scholars (Chaonan Wang, Dasen Ren, Ho Seok Park, Zegang Dong, YinyeYang, Qingwei Ren, XuYu. Electron-spun 2D MoS 2 -decorated carbon nanofibers aspseudocapacitive electrode material into lithium ion battery[J]. Journal of Alloys and Compounds, 2017, 728: 767-772. Chen Chen, Guoqing Li, Yao Lu, JiadengZhu, Mengjin Jiang, Yi Hu, Linyou Cao, Xiangwu Zhang .Chemical vapor depositedMoS 2 / electrospun carbon nanofiber composite as anode material for high-performance sodium-ion batteries[J]. Electrochimica Acta, 2016, 222: 1751-1760. Xiaoqin Xiong, Wei Luo, Xianluo Hu, Chaoji Chen, Long Qie, Dongfang Hou, Yunhui Huang. Flexible Membranes of MoS 2 / C Nanofibers by Electrospinning as Binder-Free Anodes for High-Performance Sodium-Ion Batteries [J]. Scientific Reports, 2015, 5: 9254.) has successfully used carbon nanofibers to load MoS 2 And applied in LIB, Na-ion battery, buffered MoS 2 volume change, which effectively enhances the electrochemical performance, but the carbon nanofibers have less pores and it is difficult to load a high content of MoS 2

Wang et al. (Rutao Wang, Shijie Wang, Dongdong Jin, Yabin Zhang, Yaojun Cai, Jianmin Ma, Li Zhang. Engineering layer structure of MoS 2 -graphene composites with robust and fast lithium storage for high-performance Li-ion capacitors[J].Energy Storage Materials, 2017, 9:195-205) designed and prepared MoS 2 / graphene composite material, and use it as a negative electrode to construct a lithium-ion capacitor with excellent electrochemical performance, but the cost of graphene is high and it is difficult to achieve large-scale production

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