Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201802977
Keywords
atomic ion intercalation; ex situ study; layered materials; Li-ion storage; operando spectroscopic study
Categories
Funding
- National Key RAMP
- D Program of China [2017YFA0303500]
- NSFC [U1532112, 11574280, 11605201, 21727801]
- Fundamental Research Funds for the Central Universities [WK2310000074]
- Anhui Provincial Natural Science Foundation [1708085QB27]
- CAS Key Research Program of Frontier Sciences [QYZDB-SSW-SLH018]
- CAS Interdisciplinary Innovation Team
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University (111 project) [B12015]
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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 Sn4+-decorated vanadium carbide (V2C) 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 V2C@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.
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