Journal
SOLID STATE IONICS
Volume 341, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2019.115050
Keywords
Potassium ion battery; Salt-concentrated electrolyte; Graphite; Ether-based electrolyte; Ion-solvent co-intercalation
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Funding
- Fundamental Research Funds for the Central Universities, China [ZYGX2016J044]
- Opening Project of State Key Laboratory of Advanced Chemical Power Sources [SKL-ACPS-C-12]
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Potassium ion batteries have emerged as promising energy storage devices. Searching for proper electrode materials is still a challenge. Graphite as an anode has been demonstrated a good potassium storage capability. Here, in this work, we study the effect of electrolytes (KFSI-DME) with different salt concentrations on the electrochemical performance of graphite. Electrolyte with a high salt concentration (7 mol kg(-1)) provides a desolvated K+ intercalation behavior, giving a high K storage capacity of similar to 232 mAh g(-1), a low insertion voltage at similar to 0.2 V K+/K, a high Coulombic efficiency, and a better cycling performance. In a dilute concentration electrolyte (3 mol kg(-1)), [K-DMEx](+) complexes co-insert into the graphite at an operational voltage above 0.5 V vs. K+/K with a specific discharge capacity of 187 mAh g(-1). Optimizing the electrolyte composition provides an effective way to improve the energy density including capacity and operational voltage as well as enhance cycling life of the graphite electrode.
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