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Co2+xTi1−xO4 nano-octahedra as high performance anodes for lithium-ion batteries

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Abstract

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

Graphical abstract: Co2+xTi1−xO4 nano-octahedra as high performance anodes for lithium-ion batteries

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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, Advance Article
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    Co2+xTi1−xO4 nano-octahedra as high performance anodes for lithium-ion batteries

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

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