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Co2+xTi1-xO4 Nano-Octahedrons as High Performance Anode for Lithium-ion Batteries

Abstract

Single crystal Co2+xTi1-xO4 nano-octahedrons enclosed by {111} planes with average edge length of 200 nm have been synthesized by a one-step hydrothermal approach using economical TiO2 as titanium source. The structured of Co2+xTi1-xO4 is actually an inverse spinel with Co amount excess solid solution. As anode materials for lithium-ion batteries (LIBs), the Co2+xTi1-xO4 electrodes were delivered a high specific capacity of over 766.5 mAh•g−1 at the current of 100 mA•g-1 after 60 cycles, as well as provided stable rate capability and lithium storage performance at high current density (680 mAh•g-1 after 400 cycles at 1000 mA•g-1). The excellent electrochemical performance is mainly derived from the atomic level combination of the two active materials (the CoO and TiO2 matrix) with different lithium storage mechanism (conversion reaction and insertion/extraction) after initial discharge process. Especially, the nanostructured TiO2 matrix formed after the first cycle in the electrode would alleviate large volume changes and avoid rapid capacity fading, which could endows Co2+xTi1-xO4 electrodes excellent structural stability.

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Publication details

The article was received on 06 Feb 2017, accepted on 05 Apr 2017 and first published on 06 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA01152K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Co2+xTi1-xO4 Nano-Octahedrons as High Performance Anode for Lithium-ion Batteries

    Z. Xing, X. Ji, Y. Zhao, H. Ren, Y. Deng, Z. Ju and Q. Zhuang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA01152K

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