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Atomic Sn 4+ Decorated into Vanadium Carbide MXene Interlayers for Superior Lithium Storage
Author(s) -
Wang Changda,
Chen Shuangming,
Xie Hui,
Wei Shiqiang,
Wu Chuanqiang,
Song Li
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201802977
Subject(s) - materials science , vanadium , intercalation (chemistry) , vanadium carbide , tin , lithium (medication) , energy storage , electrode , valence (chemistry) , carbide , ion , chemical engineering , nanotechnology , inorganic chemistry , chemistry , metallurgy , medicine , organic chemistry , quantum mechanics , engineering , endocrinology , power (physics) , physics
Abstract Ion intercalation is an important way to improve the energy storage performance of 2D materials. The dynamic energy storage process in such layered intercalations is important but still a challenge mainly due to the lack of effective operando methods. Herein, a unique atomic Sn 4+ –decorated vanadium carbide (V 2 C) MXene not only exhibiting highly enhanced lithium‐ion battery (LIB) performance, but also possessing outstanding rate and cyclic stability because of the expanded interlayer space and the formation of VOSn bonding is demonstrated. In combination with ex situ tests, an operando X‐ray absorption fine structure measurement is developed to explore the dynamic mechanism of V 2 C@Sn MXene electrodes in LIBs. The results clearly reveal the valence changes of vanadium (V), tin (Sn), and positive contribution of oxygen (O) atoms during the charging/discharging process, confirming their contribution for lithium storage capacity. The stability of intercalated MXene electrode is further in situ studied to prove the key role of VOSn bonding.