PPy-encapsulated SnS2 Nanosheets Stabilized by Defects on a TiO2 Support as a Durable Anode Material for Lithium-Ion Batteries

Ling Wu; Jie Zheng; Liang Wang; Xunhui Xiong; Yanyan Shao; Gang Wang; Jeng-Han Wang; Shengkui Zhong; Minghong Wu

doi:10.1002/anie.201811784

PPy-encapsulated SnS₂ Nanosheets Stabilized by Defects on a TiO₂ Support as a Durable Anode Material for Lithium-Ion Batteries

Angew Chem Int Ed Engl. 2019 Jan 14;58(3):811-815. doi: 10.1002/anie.201811784. Epub 2018 Dec 17.

Authors

Ling Wu¹, Jie Zheng², Liang Wang³, Xunhui Xiong², Yanyan Shao⁴, Gang Wang², Jeng-Han Wang⁴, Shengkui Zhong¹, Minghong Wu³

Affiliations

¹ School of Iron and Steel, Soochow University, Suzhou, 215021, P. R. China.
² Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, P. R. China.
³ Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, P. R. China.
⁴ Department of Chemistry, National (Taiwan) Normal University, Taipei, 11677, Taiwan.

PMID: 30417513
DOI: 10.1002/anie.201811784

Abstract

Nanostructured-alloy-type anodes have received great interest for high-performance lithium-ion batteries (LIBs). However, these anodes experience huge volume fluctuations during repeated lithiation/delithiation and are easily pulverized and subsequently form aggregates. Herein, an efficient method to stabilize alloy-type anodes by creating defects on the surface of the metal oxide support is proposed. As a demonstration, PPy-encapsulated SnS₂ nanosheets supported on defect-rich TiO₂ nanotubes were produced and investigated as an anode material for LIBs. Both experimental results and theoretical calculations demonstrate that defect-rich TiO₂ provides more chemical adhesions to SnS₂ and discharge products, compared to defect-poor TiO₂ , and then effectively stabilizes the electrode structure. As a result, the composite exhibits an unprecedented cycle stability. This work paves the way to designing durable and active nanostructured-alloy-type anodes on oxide supports.

Keywords: SnS2 anode; TiO2 support; cycle stability; lithium-ion battery; oxygen defect.

Abstract

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