Affiliation:
1. Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China
2. School of Arts and Sciences Shanghai Dianji University Shanghai 201306 China
3. Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China
Abstract
AbstractTitanium selenide (TiSe2), a model transition metal chalcogenide material, typically relies on topotactic ion intercalation/deintercalation to achieve stable ion storage with minimal disruption of the transport pathways but has restricted capacity (<130 mAh g−1). Developing novel energy storage mechanisms beyond conventional intercalation to break capacity limits in TiSe2 cathodes is essential yet challenging. Herein, the ion storage properties of TiSe2 are revisited and an unusual thermodynamically stable twin topotactic/nontopotactic Cu2+ accommodation mechanism for aqueous batteries is unraveled. In situ synchrotron X‐ray diffraction and ex situ microscopy jointly demonstrated that topotactic intercalation sustained the ion transport framework, nontopotactic conversion involved localized multielectron reactions, and these two parallel reactions are miraculously intertwined in nanoscale space. Comprehensive experimental and theoretical results suggested that the twin‐reaction mechanism significantly improved the electron transfer ability, and the reserved intercalated TiSe2 structure anchored the reduced titanium monomers with high affinity and promoted efficient charge transfer to synergistically enhance the capacity and reversibility. Consequently, TiSe2 nanoflake cathodes delivered a never‐before‐achieved capacity of 275.9 mAh g−1 at 0.1 A g−1, 93.5% capacity retention over 1000 cycles, and endow hybrid batteries (TiSe2‐Cu||Zn) with a stable energy supply of 181.34 Wh kg−1 at 2339.81 W kg−1, offering a promising model for aqueous ion storage.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献