Regulating the interfacial chemistry enables fast-kinetics hard carbon anodes for potassium ion batteries

Zhenlu Yu, Qun Liu, Changsheng Chen, Ye Zhu, Biao Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)

Abstract

Whether carbon anodes could sustain the high-rate potassium ion batteries (PIBs) remains controversial, owing partly to the distinct electrode preparation protocols and electrolyte systems in reported works. Herein, we adopt a freestanding carbon nanofiber (CNF) film as a model system to explore the charge transfer kinetics in carbon anodes. Without the interference of binders and additives, we probe the effect of interfacial chemistry and boost the kinetics through a tetrahydrofuran-based electrolyte. The weak solvent-cation interaction promotes the rapid desolvation of potassium ions. More importantly, such an electrolyte also benefits the formation of a thin and uniform solid electrolyte interphase. Consequently, the CNFs anode exhibits fast kinetics evidenced by a capacity of 143 mAh g−1 at a large current density of 1.5 A g−1 (∼5.4C) and 200 mAh g−1 at a low temperature of 0 C, significantly outperforming the performance in classical carbonate electrolytes. This work demonstrates the critical roles of electrode/electrolyte interfaces in determining the stability and kinetics of PIBs.

Original languageEnglish
Article number232592
JournalJournal of Power Sources
Volume557
DOIs
Publication statusPublished - 15 Feb 2023

Keywords

  • Ether-based electrolyte
  • Kinetics
  • Potassium-ion batteries
  • Solid–electrolyte interphase
  • Weak solvation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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