标题:Rechargeable potassium-ion batteries enabled by potassium-iodine conversion chemistry
作者:Lu, Ke ;Zhang, Hong ;Ye, Fangliang ;Luo, Wei ;Ma, Houyi ;Huang, Yunhui
作者机构:[Lu, Ke ;Zhang, Hong ;Ma, Houyi ] Key Laboratory for Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineer 更多
通讯作者:Luo, Wei
通讯作者地址:[Luo, W] Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji UniversityChina;
来源:Energy Storage Materials
出版年:2019
卷:16
页码:1-5
DOI:10.1016/j.ensm.2018.04.018
关键词:Conversion chemistry; Porous carbon scaffold; Potassium ion storage; Potassium-iodine batteries; Solid-liquid-solid phase transition
摘要:Potassium-ion batteries (KIBs) have emerged as attractive alternatives to dominative lithium-ion batteries for grid-level electricity storage due to lower potential of K+/K redox couple in non-aqueous electrolyte and abundant potassium resource. The current intercalation cathodes used in KIBs provide limited active sites in their frameworks while conversion chemistry offers the feasibility for much improved potassium-ion storage capability. We for the first time demonstrate a rechargeable potassium-iodine (K-I2) battery enabled by a two-electron K-I2 conversion reaction. With the help of in-situ Raman and ex-situ X-ray photoelectron spectroscopy, we confirm that the highly reversible conversion among I2, KI3 and KI involves solid-liquid-solid phase transitions and the formation of soluble KI3 intermediate enables the fast reaction kinetics. The K-I2 battery delivers a reversible capacity of 156 mA h/g and a small capacity decay of 0.058% per cycle over 500 cycles. © 2018
收录类别:EI;SCOPUS
Scopus被引频次:5
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85045613644&doi=10.1016%2fj.ensm.2018.04.018&partnerID=40&md5=3d6914994e64a5b50ed788a787d3413d
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