V2O5 coral microspheres: High performance electrode material for Li-ion supercapacitor

• Published in: Materials letters 2024-04, Vol.360, p.135956, Article 135956
• Main Authors: Singh, Arun Kumar, Deepak, Nav, Shukla, Shobha, Saxena, Sumit
• Format: Article
• Language: English
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2024.135956

•Enhanced storage with coral microstructures.•Improved specific capacitance of 360 F/g.•Enhanced capacitance retention and cycle life for V2O5 nanostructures. Energy storage devices forms lifeline for most modern devices. The short life cycle and lower power density of batteries has prompted development of supercapacitors as potential alternatives. Li-ion supercapacitors, is an emerging class of energy storage devices. Natural abundance and availability of variable oxidation states make V2O5 an attractive electrode material. Here, we report synthesis of coral microspheres of V2O5 using low temperature solvothermal technique, as electrode material for Li-ion supercapacitor. The annealing temperature plays a cucial role in formation of microspherical aggregates, dictates their surface area and hence the energy storage performance. Samples annealed at 400 °C showed specific capacitance of ∼360 F/g at current density of 0.5 A/g. Our studies suggest that V2O5 based nanostructures holds significant potential for development of hybrid Li-ion supercapacitors.