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Unveiling the Effect of Surface and Bulk Structure on Electrochemical Properties of Disproportionated SiO x Anodes
Author(s) -
Long Zuxin,
Fu Rusheng,
Ji Jingjing,
Feng Zuyong,
Liu Zhaoping
Publication year - 2020
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.202000150
Subject(s) - materials science , anode , microstructure , overpotential , amorphous solid , electrochemistry , annealing (glass) , disproportionation , nanocrystalline material , chemical engineering , ion , silicon , nanotechnology , metallurgy , crystallography , chemistry , electrode , biochemistry , organic chemistry , engineering , catalysis
As a promising lithium‐ion battery anode materials, silicon suboxides (SiO x ) exhibit elusive microstructure with atomic‐scale disproportionation which reveals a strong relation to performance. Generally, the structure of SiO x could be tuned via high‐temperature treatment. In this work, disproportionated SiO x are prepared to systematically discuss the internal relationship among microstructure, physicochemical properties and electrochemical performance. After annealing, amorphous SiO 2 and nanocrystalline Si appear, and the SiO 2 accumulating on the surface results in large resistance and low Li‐ion diffusivity, which leads to large overpotential and poor performance. If mechanical milling is employed followed by annealing, the SiO 2 layer can be crushed, SiO x and Si with electrochemical activity are uncovered. Further research on the SiO x with diverse degrees of disproportionation indicates that proper amount of Si and SiO 2 determines the optimal electrochemical performance. This result gives an in‐depth understanding and probable guidance to the modification investigation of SiO x anode for Li‐ion batteries.