Preparation and Electrochemical Performance Analysis of TiO_2/TiC@S Cathode Material for Lithium-sulfur Batteries

Yeli Yan ； Haodong Yin ； Fanghao Li ； Zhibin Wang ； Peibo Shi

《World Scientific Research Journal》 8卷7期 (2022/07) Pp. 234-241

https://doi.org/10.6911/WSRJ.202207_8(7).0034

摘要

In order to solve the problems of volume change and poor conductivity of sulfur electrode during charging and discharging of lithium‐sulfur batteries, a solution method was proposed to prepare TiO_2/TiC@S composite electrode materials by sol‐gel and hot-melt methods. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analyzer (TGA) and other characterization techniques were used to study and analyze the microscopic morphology, synthesis, and sulfur loading content of the prepared materials. At the same time, the adsorption capacity of LiPSs was studied by UV‐Vis absorption spectroscopy, and the electrochemical properties of the materials were tested by constant current charge-discharge and cyclic voltammetry curves. The results show that the surface of TiO_2/TiC@S composites is loose and porous, the particles are evenly distributed, and the sulfur is effectively combined with the matrix material, which can effectively ensure the conductivity of the electrode material. The high adsorption capacity of TiO_2/TiC composites for LiPSs can effectively reduce the ＂shuttle effect＂ of lithium‐sulfur batteries and improve the discharge specific capacity and cycle performance of the batteries. At 0.2 C, the initial capacity is as high as 847.90 mAh．g^(‐1)) (1 C=1675 mAh．g^(‐1)), and it remains at 411.51 mAh．g^(‐1)) after 500 cycles, and its capacity retention rate reaches 48.53%, showing that Good long cycle performance.

關鍵字

Lithium‐sulfur batteries ； TiO_2/TiC ； Positive electrode material ； Titanium carbide ； Titanium dioxide

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