best17y-niobium-v-oxide-nb205-powder

A Novel Hybrid Supercapacitor Using a Graphite Cathode and a Niobium(V) Oxide Anode

A Novel Hybrid Supercapacitor Using a Graphite Cathode and a Niobium(V) Oxide Anode

Gum-Jae Park, D. Kalpana,† Arjun Kumar Thapa, Hiroyoshi Nakamura, Yun-Sung Lee,†,* and Masaki Yoshio*
Department of Applied Chemistry, Saga University, Saga 840-8502, Japan. *E-mail: yoshio@cc.saga-u.ac.jp
†Faculty of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Korea
*E-mail: leeys@chonnam.ac.kr

abstract
To meet the high current load requirement from the high energy density realized by metal oxide and high power
density graphite, we propose a novel hybrid supercapacitor consisting of Nb2O5 and KS6 graphite in 1.0 M
LiPF6-EC:DEC (1:2). This new system exhibits a sloping voltage profile from 2.7 to 3.5 V during charging and
presents a high operating voltage plateau between 1.5 and 3.5 V during discharging. The cell was tested at a current
density of 100 mA/g with a cut-off voltage between 3.0 and 1.0 V. This novel energy storage system delivers the
highest initial discharge capacity of 55 mAh/g and exhibits a good cycle performance.
Key Words: Novel energy storage system, Graphite, Niobium(V) oxide, Intercalation/de-intercalation

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