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Interlayer Expanded SnS 2 Anchored on Nitrogen‐Doped Graphene Nanosheets with Enhanced Potassium Storage
Author(s) -
Cao Liang,
Zhang Bao,
Ou Xing,
Wang Chunhui,
Peng Chunli,
Zhang Jiafeng
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900346
Subject(s) - materials science , anode , graphene , nanocrystal , nanostructure , nanotechnology , electrochemistry , energy storage , intercalation (chemistry) , doping , chemical engineering , lithium (medication) , electrode , ion , inorganic chemistry , optoelectronics , chemistry , medicine , power (physics) , physics , organic chemistry , quantum mechanics , endocrinology , engineering
Potassium‐ion batteries (PIBs) are promising candidates to substitute lithium‐ion batteries (LIBs) as large‐scale energy storage devices. However, developing suitable anode materials is still a great challenge that has limited the anticipated application of PIBs. Herein, the interlayer expanded SnS 2 nanocrystals anchored on nitrogen‐doped graphene nanosheets (SnS 2 @NC) are synthesized following a facile one‐step hydrothermal strategy. Relying on the exquisite nanostructure with larger interlayer spacing, the K + ions diffusion and charge transfer will be accelerated. In addition, the intense coupling interaction between nitrogen‐doped graphene nanosheets and SnS 2 can endow a sturdy nanostructure, avoiding the collapse and aggregation of SnS 2 nanocrystals upon cycling. Based on the above merits, the as‐prepared SnS 2 @NC anode exhibits improved electrochemical performanc (desirable rate capability of 206.7 mAh g −1 at 1000 mA g −1 and advanced cyclic property of 262.5 mAh g −1 , while after 100 cycles at 500 mA g −1 ). More importantly, multistep reactions of K + storage mechanism combining with intercalation, conversion and alloying reactions are clearly illustrated by combined in‐situ XRD measurement and ex‐situ TEM detection. This strategy of enhancing K + storage performances has a great potential for other electrode materials.