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Design and synthesis of Janus-structured mutually-doped SnO2-Co3O4 hollow nanostructures as superior anode materials for lithium-ion batteries

Abstract

Janus-structured materials composed of mutually doped SnO2-Co3O4 hollow nanostructures were designed and synthesized for use as an efficient anode material for lithium-ion batteries. The Janus-structured powders consisting of Co-doped SnSe nanoplates and Sn-doped CoSex polyhedral structures were synthesized by a one-pot spray pyrolysis process. Similarly, structured SnO2-Co3O4 powders consisting of Co-doped SnO2 hollow nanoplates and Sn-doped Co3O4 hollow polyhedral structures were prepared by a nanoscale Kirkendall diffusion process. The doping of both materials in the hollow SnO2 nanoplate and Co3O4 polyhedral structure improved the reversible capacities and cycling performances of the Janus-structured SnO2-Co3O4 composite powders. This was achieved by minimizing the growth of metallic Sn and Co nanocrystals during cycling, improving the decomposition of Li2O, and facilitating the conversion of Sn to SnO2 during the delithiation process through a catalytic effect of metallic Co. The discharge capacity of the Janus-structured SnO2-Co3O4 hollow powders with Sn:Co ratio of 1:2 at a current density of 1 A g-1 for the 1000th cycle was 1058.7 mA h g-1. These Janus-structured mutually-doped SnO2-Co3O4 composite powders showed extraordinary cycling and rate performances for lithium ion storage.

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Publication details

The article was received on 21 Sep 2017, accepted on 14 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08335A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Design and synthesis of Janus-structured mutually-doped SnO2-Co3O4 hollow nanostructures as superior anode materials for lithium-ion batteries

    G. D. Park, J. Lee and Y. C. Kang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08335A

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