Unveiling BiVO4 nanorods as a novel anode material for high performance lithium ion capacitors : beyond intercalation strategies
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Jayaramulu, Kolleboyina (Palacky University)
Zboril, Radek (Palacky University)
Fischer, Roland A. (Technical University of Munich. Department of Inorganic and Metal-Organic Chemistry)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)

Data:	2018
Resum:	Energy storage is increasingly demanded in many new niches of applications from wearables to unmanned autonomous vehicles. However, current energy storage systems are unable to fulfill the power requirements (high energy at high power) needed for these novel applications. Recently, Li-ion capacitors (LICs) have been spotted as hybrid devices with the potential to display high energy and high power. Nevertheless, it is still a great challenge to achieve high performance LICs due to the unmatched kinetic properties and capacity between anode and cathode materials. Herein, we are presenting our first seminal report on the use of BiVO nanorods as a new anode material for LICs coupled with a partially reduced graphene oxide (PRGO) cathode. The BiVO nanorods show an excellent reversible capacity of 877 mA h g (ultrahigh volumetric capacity of 4560 mA h cm) at 1. 1 A g with a great capacity retention (in half-cell design), which is the highest value reported so far for metal vanadates. Later on, a LIC was constructed with BiVO as the anode and PRGO as the cathode electrode, delivering a high energy density of 152 W h kg and a maximum power density of 9. 6 kW kg compared to that for hard carbon and intercalation (such as LiTiO and LiVO) based anode materials. Additionally, the BiVO//PRGO LIC exhibits a good cyclability of 81% over 6000 cycles. Thus, this investigation opens up new opportunities to develop different LIC systems.
Ajuts:	Ministerio de Economía y Competitividad MAT2015-68394-R Ministerio de Economía y Competitividad SEV-2013-0295
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Cath-ode materials ; High energy densities ; Lithium-ion capacitors ; Maximum power density ; Reduced graphene oxides ; Reversible capacity ; Unmanned autonomous vehicles ; Volumetric capacity
Publicat a:	Journal of materials chemistry, Vol. 6, Issue 14 (April 2018) , p. 6096-6106, ISSN 2050-7496

DOI: 10.1039/c8ta00549d

Postprint 53 p, 3.2 MB

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