High energy density asymmetric quasi-solid-state supercapacitor based on porous vanadium nitride nanowire anode

Xihong Lu; Minghao Yu; Teng Zhai; Gongming Wang; Shilei Xie; Tianyu Liu; Chaolun Liang; Yexiang Tong; Yat Li

doi:10.1021/nl400760a

High energy density asymmetric quasi-solid-state supercapacitor based on porous vanadium nitride nanowire anode

Nano Lett. 2013 Jun 12;13(6):2628-33. doi: 10.1021/nl400760a. Epub 2013 May 3.

Authors

Xihong Lu¹, Minghao Yu, Teng Zhai, Gongming Wang, Shilei Xie, Tianyu Liu, Chaolun Liang, Yexiang Tong, Yat Li

Affiliation

¹ KLGHEI of Environment and Energy Chemistry, MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.

PMID: 23634667
DOI: 10.1021/nl400760a

Abstract

To push the energy density limit of asymmetric supercapacitors (ASCs), a new class of anode materials is needed. Vanadium nitride (VN) holds great promise as anode material for ASCs due to its large specific capacitance, high electrical conductivity, and wide operation windows in negative potential. However, its poor electrochemical stability severely limits its application in SCs. In this work, we demonstrated high energy density, stable, quasi-solid-state ASC device based on porous VN nanowire anode and VOx nanowire cathode for the first time. The VOx//VN-ASC device exhibited a stable electrochemical window of 1.8 V and excellent cycling stability with only 12.5% decrease of capacitance after 10,000 cycles. More importantly, the VOx//VN-ASC device achieved a high energy density of 0.61 mWh cm(-3) at current density of 0.5 mA cm(-2) and a high power density of 0.85 W cm(-3) at current density of 5 mA cm(-2). These values are substantially enhanced compared to most of the reported quasi/all-solid-state SC devices. This work constitutes the first demonstration of using VN nanowires as high energy anode, which could potentially improve the performance of energy storage devices.