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Achieving High-Performance 3D K+ -Pre-intercalated Ti3 C2 Tx MXene for Potassium-Ion Hybrid Capacitors via Regulating Electrolyte Solvation Structure.

Shuoqing ZhaoZhichao LiuGuanshun XieXin GuoZiqi GuoFei SongGuohao LiChi ChenXiuqiang XieNan ZhangBing SunShaojun GuoGuoxiu Wang
Published in: Angewandte Chemie (International ed. in English) (2021)
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 Tx 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 Tx electrode, which is beneficial for interfacial stability and reaction kinetics. As a proof of concept, 3D K+ -Ti3 C2 Tx //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.
Keyphrases
  • ionic liquid
  • ion batteries
  • reduced graphene oxide
  • gold nanoparticles
  • molecular dynamics simulations
  • wastewater treatment
  • solid state
  • tandem mass spectrometry