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Facile synthesis of Co9S8 nanosheets for lithium ion batteries with enhanced rate capability and cycling stability

Abstract

Two-dimensional Co9S8 nanosheets with the thickness of ~10nm and lateral size of several hundred nanometers are facilely synthesized through a polyvinyl alcohol (PVA)-assisted precipitation process in an aqueous solution. The process is low energy consumption and easy for scale-up. Compared to the Co9S8 nanoparticles with diameter of 40 nm prepared through the same process without PVA, the Co9S8 nanosheets, employed as an anode material in lithium-ion batteries, exhibited enhanced rate capability and cycling stability due to their unique two-dimensional nanostuctures. When discharging/charging at 1.0 A g-1, the Co9S8 nanosheets can deliver reversible capacity as high as 746.8 mAh g-1 after 300 cycles, which is much higher than that of Co9S8 nanoparticles (63.6 mAh g-1), making the Co9S8 nanosheets as promising candidates for anode materials in high-energy and high-power lithium ion batteries.

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Publication details

The article was received on 28 May 2017, accepted on 13 Jul 2017 and first published on 14 Jul 2017


Article type: Paper
DOI: 10.1039/C7NJ01871A
Citation: New J. Chem., 2017, Accepted Manuscript
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    Facile synthesis of Co9S8 nanosheets for lithium ion batteries with enhanced rate capability and cycling stability

    P. Long, Z. Zhang, G. Peng, Q. Zhang, D. Liu, X. Xu and X. Yao, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01871A

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