直流电弧等离子体下共蒸发无定型TiO<sub>2</sub>基纳米复合材料及储锂性能

doi:10.11896/cldb.22030288

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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.

Key words： arc plasma amorphous TiO₂ lithium ion battery anode materials electrochemical properties

Published: 10 October 2023 Online: 2023-09-28

CLC number:

TQ152

Fund:National Natural Science Foundation of China (52101392), the Natural Science Foundation of Shandong Province (ZR2020QD081), and Science and Technology Support Program for Youth Innovation in Universities of Shandong Province (2020KJA014).

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	YANG Wenfei
	ZHANG Yong
	FAN Wenjie
	WANG Andong
	DONG Xinglong

Cite this article:

YANG Wenfei,ZHANG Yong,FAN Wenjie, et al. Co-evaporation Synthesis in Arc Plasma of Amorphous TiO₂-based Nanocomposites with Stable Lithium Storage[J]. Materials Reports, 2023, 37(19): 22030288-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22030288 OR http://www.mater-rep.com/EN/Y2023/V37/I19/22030288

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