TY - JOUR
T1 - Advanced hybrid supercapacitor based on a mesoporous niobium pentoxide/carbon as high-performance anode
AU - Lim, Eunho
AU - Kim, Haegyeom
AU - Jo, Changshin
AU - Chun, Jinyoung
AU - Ku, Kyojin
AU - Kim, Seongseop
AU - Lee, Hyung Ik
AU - Nam, In Sik
AU - Yoon, Songhun
AU - Kang, Kisuk
AU - Lee, Jinwoo
N1 - Publisher Copyright:
© 2014 American Chemical Society.
PY - 2014/9/23
Y1 - 2014/9/23
N2 - Recently, hybrid supercapacitors (HSCs), which combine the use of battery and supercapacitor, have been extensively studied in order to satisfy increasing demands for large energy density and high power capability in energy-storage devices. For this purpose, the requirement for anode materials that provide enhanced charge storage sites (high capacity) and accommodate fast charge transport (high rate capability) has increased. Herein, therefore, a preparation of nanocomposite as anode material is presented and an advanced HSC using it is thoroughly analyzed. The HSC comprises a mesoporous Nb2O5/carbon (m-Nb2O5-C) nanocomposite anode synthesized by a simple one-pot method using a block copolymer assisted self-assembly and commercial activated carbon (MSP-20) cathode under organic electrolyte. The m-Nb2O5-C anode provides high specific capacity with outstanding rate performance and cyclability, mainly stemming from its enhanced pseudocapacitive behavior through introduction of a carbon-coated mesostructure within a voltage range from 3.0 to 1.1 V (vs Li/Li+). The HSC using the m-Nb2O5-C anode and MSP-20 cathode exhibits excellent energy and power densities (74 W h kg-1 and 18 510 W kg-1), with advanced cycle life (capacity retention: 7sim;90% at 1000 mA g-1 after 1000 cycles) within potential range from 1.0 to 3.5 V. In particular, we note that the highest power density (18 510 W kg-1) of HSC is achieved at 15 W h kg-1, which is the highest level among similar HSC systems previously reported. With further study, the HSCs developed in this work could be a next-generation energy-storage device, bridging the performance gap between conventional batteries and supercapacitors.
AB - Recently, hybrid supercapacitors (HSCs), which combine the use of battery and supercapacitor, have been extensively studied in order to satisfy increasing demands for large energy density and high power capability in energy-storage devices. For this purpose, the requirement for anode materials that provide enhanced charge storage sites (high capacity) and accommodate fast charge transport (high rate capability) has increased. Herein, therefore, a preparation of nanocomposite as anode material is presented and an advanced HSC using it is thoroughly analyzed. The HSC comprises a mesoporous Nb2O5/carbon (m-Nb2O5-C) nanocomposite anode synthesized by a simple one-pot method using a block copolymer assisted self-assembly and commercial activated carbon (MSP-20) cathode under organic electrolyte. The m-Nb2O5-C anode provides high specific capacity with outstanding rate performance and cyclability, mainly stemming from its enhanced pseudocapacitive behavior through introduction of a carbon-coated mesostructure within a voltage range from 3.0 to 1.1 V (vs Li/Li+). The HSC using the m-Nb2O5-C anode and MSP-20 cathode exhibits excellent energy and power densities (74 W h kg-1 and 18 510 W kg-1), with advanced cycle life (capacity retention: 7sim;90% at 1000 mA g-1 after 1000 cycles) within potential range from 1.0 to 3.5 V. In particular, we note that the highest power density (18 510 W kg-1) of HSC is achieved at 15 W h kg-1, which is the highest level among similar HSC systems previously reported. With further study, the HSCs developed in this work could be a next-generation energy-storage device, bridging the performance gap between conventional batteries and supercapacitors.
KW - block copolymer-assisted self-assembly
KW - hybrid supercapacitors
KW - mesoporous materials
KW - NbO
KW - pseudocapacitive properties
UR - http://www.scopus.com/inward/record.url?scp=84919896626&partnerID=8YFLogxK
U2 - 10.1021/nn501972w
DO - 10.1021/nn501972w
M3 - Article
AN - SCOPUS:84919896626
SN - 1936-0851
VL - 8
SP - 8968
EP - 8978
JO - ACS Nano
JF - ACS Nano
IS - 9
ER -