期刊
ENERGY STORAGE MATERIALS
卷 20, 期 -, 页码 373-379出版社
ELSEVIER
DOI: 10.1016/j.ensm.2018.10.023
关键词
Li+/K+ mixed superconcentrated aqueous electrolyte; High voltage; Wide operation temperature range; Hybrid aqueous supercapacitors; High energy density
资金
- National Natural Science Foundation of China [21622407, 21673008, 21875266]
- Shenzhen Science and Technology Research Grant [JCYJ20170412150450297]
Aqueous electrochemical energy storage devices are always limited in the inherited weaknesses of water, such as narrow operation temperature range and electrochemical stability window (ESW). Herein, we develop a lowcost aqueous hybrid electrochemical supercapacitor, assembled with LiMn2O4 (LMO) as the cathode and activated carbon (AC) as the anode in a novel economical Li+/K+ mixed superconcentrated (SC) aqueous electrolyte with a widened electrochemical stability window of 2.85 V, in which the hydrogen bonding between water molecules is inhibited via the confinement of water molecule by intense solvation. As a result, considering the advantages of this SC electrolyte in promoting the formation of intensive solid-electrolyte-interphase (SEI) analogue on AC anode and suppressing the structural destruction of LMO cathode, this supercapacitor demonstrates outstanding performances including improved working voltage (2.0-2.5 V), wide operation temperature range, high capacity (47.5 mA h g(-1) at 60 degrees C), superb capacity retention (similar to 100% at 10 A g(-1) even after 20,000 cycles at 2.0 V), and ultrahigh energy density (77.9Wh kg(-1) at 60 degrees C).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据