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Ultrathin Phyllosilicate Nanosheets as Anode Material with Superior Rate Performance for Lithium Ion Batteries

Abstract

Phyllosilicate with SiO4 tetrahedra and metal cation-containing octahedral composed sheet structure is a promising anode material for lithium-ion batteries in terms of high abundance and three times the theoretical capacity of graphite. The main challenges associated with phyllosilicate anode are the structural degradation and the low rate capability caused by the low intrinsic electric conductivity and large strain upon cycling. Herein, we develop hybrid architectures by in-situ rooting nickel phyllosilicate within tubular carbon frameworks to form ultrathin phyllosilicate nanosheets, where the phyllosilicate is spatially incorporated within carbon rather than superficially coating on their outer surface. The carbon frameworks significantly enhance the electrical conductivity and steadily buffer volumetric strain of the ultrathin phyllosilicate nanosheets upon cycling. The tubular hybrid architectures can provide accessible electroactive sites and allows rapid electrons/ions transfer. When applied as lithium-ion batteries anode materials, the prepared hierarchical phyllosilicate/carbon hybrids deliver an exceptional rate capability (1017 mA h g−1 at 0.2 A g−1 and 540 mA h g−1 and 2.0 A g−1) and good cycling stability (585 mA h g−1 after 200 cycles at 1.0 A g−1), which outperform the previously reported nickel silicates materials. Full cell constructed with the nickel phyllosilicate anode and commercialized LiNi1/3Co1/3Mn1/3O2 cathode exhibits high reversible capacity in the voltage range of 0.2–4.0 V, demonstrating the great potential of phyllosilicate as anode materials.

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Publication details

The article was received on 06 Oct 2017, accepted on 12 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08817E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Ultrathin Phyllosilicate Nanosheets as Anode Material with Superior Rate Performance for Lithium Ion Batteries

    X. Zhang, W. Li, B. He, D. Yan, S. Xu, Y. Cao and A. Lu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08817E

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