期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 71, 页码 19045-19052出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201804313
关键词
anodization; batteries; binder-free; conversion reaction metal oxide; lithium-ion batteries; TiO2 nanotubes
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2015R1A4A1042434]
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy of the Korean government [20174030201500]
This paper presents an investigation of anodic TiO2 nanotube arrays (TNAs), with a Co3O4/CuO coating, for lithium-ion batteries (LIBs). The coated TNAs are investigated using various analytical techniques, with the results clearly suggesting that the molar ratio of Co3O4/CuO in the TiO2 nanotubes substantially influences its battery performance. In particular, a cobalt/copper molar ratio of 2:1 on the TNAs (Co2Cu1@TNAs) features the best LIBs anode performance, exhibiting high reversible capacity and enhanced cycling stability. Noticeably, Co2Cu1@TNAs achieve excellent rate capability even after quite a high current density of 20.0 A g(-1) (approximate to 25 C, where C corresponds to complete discharge in 1 h) and superior volumetric reversible capacity of approximate to 3330 mA h(-1) cm(-3). This value is approximately seven times higher than those of a graphite-based anode. This outstanding performance is attributed to the synergistic effects of Co2Cu1@TNAs: 1) the structural advantage of TNAs, with their large amount of free space to accommodate the large volume expansion during Li+ insertion/extraction and 2) the optimized ratio of Co3O4 and CuO in the composite for improved capacity. In addition, no binder or conductive agent is used, which is partly responsible for the overall improved volumetric capacity and electrochemical performance.
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