Details

Autor(en) / Beteiligte

• Cao, Jun‐Ming
• Ma, Ming‐Yang
• Liu, Han‐Hao
• Yang, Jia‐Lin
• Liu, Yue
• Zhang, Kai‐Yang
• Butt, Faaz A.
• Gu, Zhen‐Yi
• Li, Kai
• Wu, Xing‐Long

Titel

Interfacial‐Confined Isochronous Conversion to Biphasic Selenide Heterostructure with Enhanced Adsorption Behaviors for Robust High‐Rate Na‐Ion Storage

Ist Teil von

• Small (Weinheim an der Bergstrasse, Germany), 2024-03, Vol.20 (11), p.e2311024-n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2024

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• Sodium‐ion batteries (SIBs) have gradually become one of the most promising energy storage techniques in the current era of post‐lithium‐ion batteries. For anodes, transitional metal selenides (TMSe) based materials are welcomed choices , owing to relatively higher specific capacities and enriched redox active sites. Nevertheless, current bottlenecks are blamed for their poor intrinsic electronic conductivities, and uncontrollable volume expansion during redox reactions. Given that, an interfacial‐confined isochronous conversion strategy is proposed, to prepare orthorhombic/cubic biphasic TMSe heterostructure, namely CuSe/Cu3VSe4, through using MXene as the precursor, followed by Cu/Se dual anchorage. As‐designed biphasic TMSe heterostructure endows unique hierarchical structure, which contains adequate insertion sites and diffusion spacing for Na ions, besides, the surficial pseudocapacitive storage behaviors can be also proceeded like 2D MXene. By further investigation on electronic structure, the theoretical calculations indicate that biphasic CuSe/Cu3VSe4 anode exhibits well‐enhanced properties, with smaller bandgap and thus greatly improves intrinsic poor conductivities. In addition, the dual redox centers can enhance the electrochemical Na ions storage abilities. As a result, the as‐designed biphasic TMSe anode can deliver a reversible specific capacity of 576.8 mAh g−1 at 0.1 A g−1, favorable Na affinity, and reduced diffusion barriers. This work discloses a synchronous solution toward demerits in conductivities and lifespan, which is inspiring for TMSe‐based anode development in SIBs systems. An interfacial‐confined isochronous conversion strategy is conducted to prepare a hierarchical biphasic selenide, by choosing metallic conductive V2CTx MXene as the precursor. As‐designed biphasic selenide exhibits excellent electronic conductivity and abundant active sites for Na ions. Besides, the carbonaceous matrix can serve as a stable buffer layer to alleviate the volume expansion of selenides during battery operation.