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Issue 14, 2018
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Cobalt-doped Zn2GeO4 nanorods assembled into hollow spheres as high-performance anode materials for lithium-ion batteries

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Abstract

In the search for high-performance anodes for next-generation lithium-ion batteries (LIBs), germanium-based compounds are recognized as one of the most promising candidates due to their extremely high theoretical capacity. In this study, a facile TEOA-assisted technology is presented to successfully fabricate Co-doped Zn2GeO4 hollow microspheres. The shell of the hollow microspheres is constructed by the self-assembly of uniform 1D single-crystalline nanorods with a length and diameter of about 2 μm and 100 nm, respectively. The reaction mechanism of the Co-doped Zn2GeO4 and the formation mechanism of the uniquely hollow structure were discussed. When used as an anode material for LIBs, the optimized Co-doped Zn2GeO4 hollow microspheres deliver a high discharge capacity of 1419 mA h g−1 and a high charge capacity of 1063 mA h g−1 for the first cycle, corresponding to a very high initial coulombic efficiency of 75%. A high capacity of 882 mA h g−1 at 1.0 A g−1 after 100 discharge–charge cycles was maintained and a capacity of 464 mA h g−1 can be retained even at a high current density of 5.0 A g−1. The remarkable electrochemical lithium storage performance can be a result of the synergistic effect of the hierarchical hollow structure and unique chemical composition. The hierarchical hollow structure allows for easy diffusion of electrolytes and shortens the pathway of Li+ transport during repeated Li+ extraction/insertion. Meanwhile, the Co doping can effectively improve charge transport for enhanced reaction kinetics.

Graphical abstract: Cobalt-doped Zn2GeO4 nanorods assembled into hollow spheres as high-performance anode materials for lithium-ion batteries

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Publication details

The article was received on 21 Jan 2018, accepted on 23 Feb 2018 and first published on 24 Feb 2018


Article type: Paper
DOI: 10.1039/C8TA00666K
Citation: J. Mater. Chem. A, 2018,6, 5926-5934
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    Cobalt-doped Zn2GeO4 nanorods assembled into hollow spheres as high-performance anode materials for lithium-ion batteries

    J. Lu, D. Li, L. Li, Y. Chai, M. Li, S. Yang and J. Liang, J. Mater. Chem. A, 2018, 6, 5926
    DOI: 10.1039/C8TA00666K

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