Atomic Sn4+ Decorated into Vanadium Carbide MXene Interlayers for Superior Lithium Storage. Issue 4 (4th December 2018)

• Record Type: Journal Article
• Authors: Wang, Changda; Chen, Shuangming; Xie, Hui; Wei, Shiqiang; Wu, Chuanqiang; Song, Li
• Is Part Of: Advanced energy materials. Volume 9:Issue 4(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-12-04
• Subjects: atomic ion intercalation -- ex situ study -- layered materials -- Li‐ion storage -- operando spectroscopic study; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201802977
• Languages: English
• ISSNs: 1614-6832

Abstract

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 (V2 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 VOSn 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 V2 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 VOSn bonding. Abstract : Atomic Sn 4+ –decorated V2 C MXene with outstanding Li + storage properties is demonstrated. In combination with ex situ tests, operando X‐ray absorption fine structure and Raman measurements are used to explore the mechanism. The valence changes of vanadium, tin, and positive contribution of oxygen atoms are explored. The capacity and stability of the electrodes are also in situ observed and understood.