Co-evaporation Synthesis in Arc Plasma of Amorphous TiO2-based Nanocomposites with Stable Lithium Storage
YANG Wenfei1,*, ZHANG Yong1, FAN Wenjie1, WANG Andong1, DONG Xinglong2
1 Naval Aviation University Qingdao Campus, Qingdao 266041, Shandong, China 2 Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
Abstract: TiO2 as an anode material for lithium ion batteries(LIBs) has received much attention due to its stable structure, safety and environmental benignity, as well as small volume expansion rate (≤4%) during cycling. However, the low theoretical specific capacity (335 mAh·g-1) and diffusion coefficient of lithium ions, which hinders its practical applications. According, the core-shell Cu@a.-TiO2 NPs are in situ synthesized by co-evaporation of the micron powder mixture of CuO and TiO2. The Cu core is oxidized into electrochemically active CuO phase that is used as the intermediate coating to obtain Cu@CuO@a.-TiO2 NCs. Testing results indicate that the Cu@CuO@a.-TiO2NCs electrode delivers an initial discharge specific capacity of 1 936.1 mAh·g-1. After 200 cycles, the discharge specific capacity can still maintain 882.3 mAh·g-1with a coulombic efficiency of 98.8%. The amorphous TiO2 shell provides abundant active sites to promote the diffusion and migration of lithium ions, and thus improve the transfer efficiency of charge; metallic Cu can enhance conductivity of electrode, and the interspace generated by its oxidation can accommodate volume variation, which improves the electrochemical performances of Cu@CuO@a.-TiO2 NCs electrode.
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2023, Vol. 37 
