Achieving High‐Performance 3D K+‐Pre‐intercalated Ti3C2Tx MXene for Potassium‐Ion Hybrid Capacitors via Regulating Electrolyte Solvation Structure. Issue 50 (3rd November 2021)

• Record Type: Journal Article
• Authors: Zhao, Shuoqing; Liu, Zhichao; Xie, Guanshun; Guo, Xin; Guo, Ziqi; Song, Fei; Li, Guohao; Chen, Chi; Xie, Xiuqiang; Zhang, Nan; Sun, Bing; Guo, Shaojun; Wang, Guoxiu
• Is Part Of: Angewandte Chemie international edition. Volume 60:Issue 50(2021)
• Page Start: 26246
• Page End: 26253
• Publication Date: 2021-11-03
• Subjects: anode materials -- electrochemistry -- MXenes -- potassium storage -- solid electrolyte interphase; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202112090
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The development of high‐performance anode materials for potassium‐based energy storage devices with long‐term cyclability requires combined innovations from rational material design to electrolyte optimization. A three‐dimensional K + ‐pre‐intercalated Ti3 C2 T x MXene with enlarged interlayer distance was constructed for efficient electrochemical potassium‐ion storage. We found that the optimized solvation structure of the concentrated ether‐based electrolyte leads to the formation of a thin and inorganic‐rich solid electrolyte interphase (SEI) on the K + ‐pre‐intercalated Ti3 C2 T x electrode, which is beneficial for interfacial stability and reaction kinetics. As a proof of concept, 3D K + ‐Ti3 C2 T x //activated carbon (AC) potassium‐ion hybrid capacitors (PIHCs) were assembled, which exhibited promising electrochemical performances. These results highlight the significant roles of both rational structure design and electrolyte optimization for highly reactive MXene‐based anode materials in energy storage devices. Abstract : A 3D K + ‐pre‐intercalated Ti3 C2 T x ‐MXene with a thin and inorganic‐rich solid electrolyte interphase (SEI) layer formed on its surface was employed as an anode material for potassium‐ion hybrid capacitors with high power density and superior cycling stability. This work offers a new insight into design of MXene‐based anode material and the relationship between solvation structure and SEI formation.