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나노 구조 물리 연구단
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Fast-Charging High-Energy Battery-Supercapacitor Hybrid: Anodic Reduced Graphene Oxide-Vanadium(IV) Oxide Sheet-on-Sheet Heterostructure

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Title
Fast-Charging High-Energy Battery-Supercapacitor Hybrid: Anodic Reduced Graphene Oxide-Vanadium(IV) Oxide Sheet-on-Sheet Heterostructure
Author(s)
Ramkrishna Sahoo; Tae Hoon Lee; Duy Tho Pham; Thi Hoai Thuong Luu; Young Hee Lee
Publication Date
2019-09
Journal
ACS NANO, v.13, no.9, pp.10776 - 10786
Publisher
AMER CHEMICAL SOC
Abstract
The battery-supercapacitor hybrid (BSH) device has potential applications in energy storage and can be a remedy for low-power batteries and low-energy supercapacitors. Although several studies have investigated electrode materials (particularly for a battery-type anode material) and design for BSHs, the energy density and power density are insufficient (far from the levels required for practical applications). Herein, a hierarchical vanadium(IV) oxide on reduced graphene oxide (rGO@VO2) heterostructure as an anode and activated carbon on carbon cloth (AC@CC) as a cathode are proposed for fabricating an advanced BSH. The mixed valency of V ions inside the as-prepared VO2 matrix (V3+ and V4+) facilitates redox reactions at a low potential, giving rise to rGO@VO2 as a typical anode with a working potential of 0.01-3 V (vs Li/Li+). The sheet-on-sheet heterostructured rGO@VO2 yields a high specific capacity of 1214 mAh g(-1) at 0.1 A g(-1) after 120 cycles, with a high rate capability and stability. The rGO@VO2//AC@CC BSH device exhibits a maximum gravimetric energy density of 126.7 Wh kg(-1) and a maximum gravimetric power density of similar to 10 000 W kg(-1) within a working voltage range of 1-4 V. Moreover, it exhibits fast charging times of 5 and 834 s with energy densities of 15.6 and 82 Wh kg(-1), respectively. © 2019 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/6430
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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