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Flexible All Inorganic Nanowire Bilayer Mesh as a High-Performance Lithium-Ion Battery Anode

Abstract

We report flexible binder-free inorganic nanowire bilayer mesh as a lithium-ion battery anode that provides high practical areal, gravimetric and volumetric capacities. The configuration of binder-free inorganic nanowire bilayer mesh anode is solely composed of two layers of nanowire fabric with one layer of germanium nanowires and the other of copper nanowires. This nanowires electrode exhibits a high specific capacity of 1153 mA h g-1 when cycled at 0.1 C, good rate-capability (359 mA h g-1 at the charge current density of 20 A g-1, 20 C), long-term cycling life of 1000 cycles and 1300 cycles when operated at 1 C and 10 C (discharge rate was fixed at 1 C), respectively. Tightly tangled bilayer Ge/Cu nanowire mesh not only provides strong structure to prevent the detachment of active materials, but also gives better electrical conduction due to the two layers of nanowires winding into each other instead of a clean boundary. Moreover, the loading of Ge nanowires on a 1 cm2 Cu nanowire mesh is tunable within a wide range from 0.5 to 6 mg, corresponding to high areal capacities from 0.5 to 6 mA h cm-2 and volumetric capacity from 217 to 539 mA h cm-3, which is nearly twice as high as that of commercial graphite anodes with one side coating (255 mA h cm-3) and 10 times higher than reported germanium flexible electrodes made with CNFs. A full cell battery with a capacity of 60 mA h composed of a Ge/Cu fabric anode and Li(Ni0.5Co0.3Mn0.2)O2 cathode was assembled to power up a power tool and LEDs arrays, giving a proof-of-concept example to implement nanowire mesh structure into a current battery system.

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Publication details

The article was received on 24 Aug 2017, accepted on 03 Oct 2017 and first published on 06 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07472G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Flexible All Inorganic Nanowire Bilayer Mesh as a High-Performance Lithium-Ion Battery Anode

    W. Chang, T. Kao, Y. Lin and H. Tuan, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07472G

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