期刊
APPLIED SURFACE SCIENCE
卷 547, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.149193
关键词
Fluoroethylene carbonate; Anode; Hard carbon; Electrolyte additive; Potassium ion batteries
类别
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2019R1A2C1084836, NRF-2020M3H4A1A0308425612, NRF-2018R1A4A1025169]
This study investigated the effects of fluoroethylene carbonate (FEC)-induced solid-electrolyte-interface (SEI) layers on carbon-based anode materials for potassium ion batteries (PIBs) and achieved a remarkable enhancement of cycling performance. By adding a small amount of FEC (0.2 wt%) in a carbonate-based electrolyte system, a well-balanced organic-inorganic hybrid SEI layer was formed, effectively blocking additional electrolyte decomposition and significantly improving Coulombic efficiency and capacity retention. Additionally, the FEC additive reduced the self-discharge rate, demonstrating its beneficial effect on cycling stabilities.
Potassium ion batteries (PIBs) are characterized by poor cycling stabilities and insufficient Coulombic efficiencies (CEs) due to the employment of conventional carbonate-based electrolyte systems that are normally used in lithium ion batteries. In this study, we investigated the effects of fluoroethylene carbonate (FEC)-induced solid-electrolyte-interface (SEI) layers on carbon-based anode materials for PIBs and achieved a remarkable enhancement of cycling performance by adding a small amount of FEC (0.2 wt%) in a carbonate-based electrolyte system. The 0.2 wt% FEC additive induced the formation of well-balanced organic-inorganic hybrid SEI layers, which effectively blocked additional electrolyte decomposition in consecutive discharge/charge cycles, causing a significant enhancement of CE and capacity retention. In addition, the FEC additive reduced the self-discharge rate from 2.2 to 1.5 mV h(-1), demonstrating its beneficial effect on cycling stabilities.
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