Layered carbon-based pseudocapacitive materials for lithium/sodium-ion capacitor with high energy-power densities and long cycle life  

作　　者：Mingxiang Hu Hongwei Zhang Ruitao Lv 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China [2]Key Laboratory of Advanced Materials(MOE),School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Progress in Natural Science:Materials International》2020年第1期20-27,共8页自然科学进展·国际材料（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.51722207).

摘　　要：Hybrid ion capacitors that combined high-power density of supercapacitor and high-energy density of battery are drawing attention to insufficient power densities of currently-used lithium-ion batteries(LIBs).Two kinds of layered carbon-based pseudocapacitive materials were used as both anode and cathode for lithium/sodium ion capacitors(LICs/NICs)with balanced energy/power properties.As-assembled NIC and LIC could deliver the energy densities of 125.7 Wh kg-1 and 119.6 Wh kg-1 at the power density of 7941.2 W kg-1 and 8823.5 W kg-1,respectively.The electrochemical properties of NICs were better than that of LICs when the current density was below 4 Ag-1,although the working voltage of LIC is higher than that of NICs,and the size of Na+is larger than that of Li+.Using an instantaneous potential technique,it is found that the increase of the capacity for anode material in low potential region will effectively enhance the electrochemical performance for the full device.

关 键 词：Sodium/lithium-ion capacitors High energy-power density Pseudocapacitive electrodes Layered materials 

分 类 号：TM53[电气工程—电器]