期刊
SMALL
卷 14, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201704367
关键词
ferroelectricity; layered nanostructure; pseudocapacitance; sodium ion batteries; sodium storage
类别
资金
- National Natural Science Foundation of China and Guangdong Province [U1301244]
- National Natural Science Foundation of China [51573215, 21506260, 21706294]
- Guangdong Natural Science Foundation [2014A030313159, 2016A030313354]
- Guangdong Province Sci & Tech Bureau Key Strategic Project [2016B010114004]
- Guangzhou Scientific and Technological Planning Project [2014J4500002, 201607010042]
- Fundamental Research Funds for the Central Universities [171gjc37]
Sodium ion batteries (SIB) are considered promising alternative candidates for lithium ion batteries (LIB) because of the wide availability and low cost of sodium, therefore the development of alternative sodium storage materials with comparable performance to LIB is urgently desired. The sodium ions with larger sizes resist intercalation or alloying because of slow reaction kinetics. Most pseudocapacitive sodium storage materials are based on subtle nanomaterial engineering, which is difficult for large-scale production. Here, ferroelectric Sn2P2S6 with layered nanostructure is developed as sodium ion storage material. The ferroelectricity-enhanced pseudocapacitance of sodium ion in the interlayer spacing makes the electrochemical reaction easier and faster, endowing the Sn2P2S6 electrode with excellent rate capability and cycle stability. Furthermore, the facile solid state reaction synthesis and common electrode fabrication make the Sn2P2S6 that becomes a promising anode material of SIB.
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