Self-assembly Nb2O5 microsphere with hollow and carbon coated structure as high rate capability lithium-ion electrode materials. (20th January 2020)

• Record Type: Journal Article
• Authors: Hu, Jiajun; Li, Jiajia; Wang, Kai; Xia, Hongyan
• Is Part Of: Electrochimica acta. Volume 331(2020)
• Publication Date: 2020-01-20
• Subjects: Li-ion batteries -- Rate performance -- Hollow Nb2O5 microsphere -- Carbon-coated Nb2O5 microsphere; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.135364
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Maintaining the high capacity of Li-ion batteries (LIBs) at the high rates is very important for electrode materials. Nb2 O5 material, having high power density, is a promising high performance electrode material. However, the poor electrical conductivity and the sluggish Li-ion diffusion kinetic hinder it as anode material for LIBs. In this work, hollow Nb2 O5 microsphere and carbon-coated Nb2 O5 microsphere are synthesized by the solvothermal method with subsequent heat treatment in air and argon, respectively. The electrochemical tests show that the hollow Nb2 O5 microsphere and the carbon-coated Nb2 O5 microsphere exhibit the high reversible capacities and high rate capability. Meanwhile, due to the high specific surface area and electrical conductivity, the carbon-coated Nb2 O5 microsphere shows better electrochemical performance than the hollow Nb2 O5 microsphere, and has high rate capability (193 mAh g −1 and 119 mAh g −1 at the current density of 0.1 A g −1 and 5 A g −1 ) with the retention of 63%. This kind of novel Nb2 O5 structure with high rate performance has potential as anode material for high-power LIBs.