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CTAB-assisted growth of self-supported Zn2GeO4 nanosheet network on a conductive foam as a binder-free electrode for long-life lithium-ion batteries

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Abstract

The Ge-based compounds show great potential as replacements for traditional graphite anode in lithium-ion batteries (LIBs). However, large volume changes and low conductivity of such materials result in a poor electrochemical cycling and rate performance. Herein, we fabricate a self-supported and three-dimensional (3D) sponge-like structure of interlinked Zn2GeO4 ultrathin nanosheets anchored vertically on a nickel foam (ZGO NSs@NF) via a simple hydrothermal process assisted by cetyltrimethyl ammonium bromide (CTAB). Such robust self-supported hybrid structures greatly improve the structural tolerance of the active materials and accommodate the volume variation that occurs during repeated electrochemical cycling. As expected, the self-supported ZGO NSs@NF composites demonstrate an excellent lithium storage with a high discharge capacity, a long cycling life, and a good rate capability when used as binder-free anodes for LIBs. A high reversible discharge capacity of 794 mA h g−1 is maintained after 500 cycles at 200 mA g−1, corresponding to 81% capacity retention of the second cycle. Further evaluation at a higher current density (2 A g−1) also delivers a reversible discharge capacity (537 mA h g−1) for this binder-free anode. This novel 3D structure of the self-supported ultrathin nanosheets on a conductive substrate, with its volume buffer effect and good interfacial contacts, can stimulate the progress of other energy-efficient technologies.

Graphical abstract: CTAB-assisted growth of self-supported Zn2GeO4 nanosheet network on a conductive foam as a binder-free electrode for long-life lithium-ion batteries

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Publication details

The article was received on 24 Jul 2017, accepted on 06 Nov 2017 and first published on 07 Nov 2017


Article type: Communication
DOI: 10.1039/C7NR05407F
Citation: Nanoscale, 2017, Advance Article
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    CTAB-assisted growth of self-supported Zn2GeO4 nanosheet network on a conductive foam as a binder-free electrode for long-life lithium-ion batteries

    G. Gao, Y. Xiang, S. Lu, B. Dong, S. Chen, L. Shi, Y. Wang, H. Wu, Z. Li, A. Abdelkader, K. Xi and S. Ding, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR05407F

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