插层(化学)
电解质
阳极
剥脱关节
石墨
材料科学
化学工程
钾
无机化学
离子
石墨烯
电极
纳米技术
有机化学
化学
复合材料
物理化学
冶金
工程类
作者
Dandan Wang,Lingjie Li,Zhonghua Zhang,Jing Liu,Xiaosong Guo,Changming Mao,Hongrui Peng,Zhenjiang Li,Guicun Li
出处
期刊:Small
[Wiley]
日期:2021-09-29
卷期号:17 (44)
被引量:20
标识
DOI:10.1002/smll.202103557
摘要
Mesocarbon microbeads (MCMB) are highly desirable as anode materials for rechargeable potassium ion batteries (PIBs) due to their commercially availability, high stability and low-cost. However, their charge storage and interfacial mechanisms are still unclear. In this work, the intercalation mechanisms and the solid-electrolyte-interphase (SEI) formation of the MCMB in four different electrolytes is comprehensively studied. The MCMB anodes exhibit superior rate and cycle performances via a naked K-ions sequentially staging intercalation mechanism, realizing the complete transformation from graphite to KC8 . Whereas a solvated K-ions co-intercalation mechanism of the MCMB occurs in ether-based electrolytes, which might induce graphite exfoliation and result in unsatisfied specific capacity and capacity decay. Nevertheless, this co-intercalation behavior could be effectively suppressed by a highly concentrated electrolytes. Interfacial analyses unveil the distinct SEI components, which vary with the electrolyte chemistries. These SEI components also varies from surface to bulk and especially attention should be paid to the accurate control of the concentration of the fluoroethylene carbonate additives. This work provides a panoramic understanding of the intercalation and interfacial mechanisms on the MCMB anodes for PIBs.
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