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In Operando Mechanism Analysis on Nanocrystalline Silicon Anode Material for Reversible and Ultrafast Sodium Storage
Author(s) -
Zhang Lei,
Hu Xianluo,
Chen Chaoji,
Guo Haipeng,
Liu Xiaoxiao,
Xu Gengzhao,
Zhong Haijian,
Cheng Shuang,
Wu Peng,
Meng Jiashen,
Huang Yunhui,
Dou Shixue,
Liu Huakun
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201604708
Subject(s) - materials science , anode , silicon , nanocrystalline silicon , amorphous silicon , nanocrystalline material , amorphous solid , raman spectroscopy , electrochemistry , nanotechnology , ultrashort pulse , crystalline silicon , chemical engineering , optoelectronics , electrode , crystallography , optics , chemistry , laser , physics , engineering
The electrochemical mechanism of nanocrystalline silicon anode in sodium ion batteries is first studied via in operando Raman and in operando X‐ray diffraction. An irreversible structural conversion from crystalline silicon to amorphous silicon takes place during the initial cycles, leading to ultrafast reversible sodium insertion in the newly generated amorphous silicon. Furthermore, an optimized silicon/carbon composite has been developed to further improve its electrochemical performance.