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Ion‐ and Electron‐Conductive Buffering Layer‐Modified Si Film for Use as a High‐Rate Long‐Term Lithium‐Ion Battery Anode
Author(s) -
Chen Qiulin,
Zheng Hongfei,
Yang Yifang,
Xie Qingshui,
Ma Yating,
Wang Laisen,
Peng DongLiang
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201801822
Subject(s) - anode , materials science , faraday efficiency , lithium (medication) , electrolyte , current density , composite number , electrochemistry , current collector , chemical engineering , ion , battery (electricity) , electrical conductor , layer (electronics) , nanotechnology , electrode , composite material , chemistry , organic chemistry , medicine , power (physics) , physics , engineering , quantum mechanics , endocrinology
The rational design of electrochemically and mechanically stable Si anodes is of great importance for the development of high energy density lithium‐ion batteries. In this study, patterned Si‐based (Si/ZnO/C) trilayer composite films were synthesized by magnetron sputtering with the assistance of a patterned mask. The electron‐conductive C layer at the top of the composite film is deposited to enhance the interfacial stability between active film and electrolyte. The ion‐ and electron‐conductive Li 2 O–Zn middle layer can be ingeniously introduced by means of the poor reversed conversion reaction between ZnO and Li + ions after the first cycle. The resultant Si/Li 2 O–Zn/C trilayer composite film delivers a high reversible capacity of 1536 mAh g −1 after 800 cycles at a current density of 1.0 A g −1 and a long high‐rate cycling stability (1400 mAh g −1 after 6000 cycles even at a high current density of 10.0 A g −1 ). Excellent rate capability and improved Coulombic efficiency are also achieved. The influences of the patterned structure and each modified layer on the electrochemical properties are analyzed systematically. This work offers a new and promising direction to enhance the lithium‐storage properties of Si‐based thin‐film anodes.