The Preparation And Electrochemistry Performance Of The Chalcogenide/Sisal Fiber Carbon Composite

Biomass carbon has several advantages, such as the plenty of natural porous to accommodate the lithium ion, rich resource, low cost, capable of regeneration, friendly to the environment, and favorable for scale-type industrial production, which make the biomass carbon a hot research to be applied in the anode material in lithium ion battery. The carbon anode material in this paper is derived from sisal fiber. However, the sisal fiber carbon without any treatment shows a initial capacity of 500mAh/g and a reversible capacity of 189mAh/g which is less than ideal. It can not satisfy the demand for the key materials of high energy density lithium ion battery. To solve this problem, this paper will try our best to improve the performance of the lithium storage by forming a composites.Considering the alterable valency of Mo, the multiple crystal phase structure of the molybdenum-based compounds, the higher theoretical specific capacity, the stable physics and chemistry performance, and the higher theoretical specific capacity, the cheap price and nontoxic property of the transitional metal sulfide, the MoSe2, MoS2, and MoO2 was selected as the reinforcing material in this paper. In order to synthesis the crystal without few defects, the green low-temperature hydrothermal method combine the calcination was utilized. The chalcogenide/sisal fiber carbon anode materials were successfully synthesized, at the meantime, the relationship between the various synthesis condition and the structure, the morphology and the electrochemistry performance of the obtained composites was also explored. And the optimization of synthetic condition were also determined. Result indicates that the synthetic MoSe2-MoO2@SFC composite shows a initial capacity of 724 mAh/g and a reversible capacity of 494 mAh/g over 30 cycle number at a current density of 50 mA/g. The MoS2@SFC obtained in the water solution pH range from 5 to 6 shows a initial capacity of 1312mAh/g and a rough stable reversible capacity of 646 mAh/g. The synthetic CuS@SFC composite shows a initial capacity of 903 mAh/g and a reversible capacity of 303 mAh/g over 30 cycle number. The composites effectively improved the cycle performance of the SFC.The meaning of this paper is to provide a theoretical foundation for the application of the biomass-derived carbon in anode material of lithium ion battery in future.