A High Performance Lithium-Ion Capacitor with Both Electrodes Prepared from Sri Lanka Graphite Ore

Xiaoyu Gao; Changzhen Zhan; Xiaoliang Yu; Qinghua Liang; Ruitao Lv; Guosheng Gai; Wanci Shen; Feiyu Kang; Zheng-Hong Huang

doi:10.3390/ma10040414

A High Performance Lithium-Ion Capacitor with Both Electrodes Prepared from Sri Lanka Graphite Ore

Materials (Basel). 2017 Apr 14;10(4):414. doi: 10.3390/ma10040414.

Authors

Xiaoyu Gao¹, Changzhen Zhan², Xiaoliang Yu³, Qinghua Liang⁴, Ruitao Lv⁵, Guosheng Gai⁶, Wanci Shen⁷, Feiyu Kang⁸, Zheng-Hong Huang⁹

Affiliations

¹ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. xiaoyu_ustb@163.com.
² State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. zhanchangzhen@foxmail.com.
³ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. yuxiaoliang2412@hotmail.com.
⁴ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. lqingh506@163.com.
⁵ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. lvruitao@tsinghua.edu.cn.
⁶ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. gaigs@tsinghua.edu.cn.
⁷ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. shenwc@mail.tsinghua.edu.cn.
⁸ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. fykang@tsinghua.edu.cn.
⁹ State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. zhhuang@tsinghua.edu.cn.

Abstract

The natural Sri Lanka graphite (vein graphite) is widely-used as anode material for lithium-ion batteries (LIBs), due to its high crystallinity and low cost. In this work, graphitic porous carbon (GPC) and high-purity vein graphite (PVG) were prepared from Sri Lanka graphite ore by KOH activation, and high temperature purification, respectively. Furthermore, a lithium-ion capacitor (LIC) is fabricated with GPC as cathode, and PVG as anode. The assembled GPC//PVG LIC shows a notable electrochemical performance with a maximum energy density of 86 W·h·kg^-1 at 150 W·kg^-1, and 48 W·h·kg^-1 at a high-power density of 7.4 kW·kg^-1. This high-performance LIC based on PVG and GPC is believed to be promising for practical applications, due to its low-cost raw materials and industrially feasible production.

Keywords: KOH activation; Sri Lanka graphite; graphitic porous carbon; lithium-ion capacitor.