Multi-wall carbon nanotube-induced nanobelt potassium vanadate composite as cathode for sodium-ion batteries. (20th October 2022)

• Record Type: Journal Article
• Authors: Ge, Guangxu; Zheng, Qiong; Li, Xianfeng
• Is Part Of: Electrochimica acta. Volume 430(2022)
• Publication Date: 2022-10-20
• Subjects: Potassium vanadate -- Sodium-ion batteries -- Carbon nanotubes -- Cathode materials; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2022.141128
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Sodium-ion battery is an ideal alternative to lithium-ion battery because of its resource-rich and cost-effective properties. Herein, potassium vanadate nanobelts composite (KV3 O8-x @CNTs·2.5H2 O) induced by the multi-wall carbon nanotube (MWCNT) is synthesized via a hydrothermal treatment process as a cathode material for sodium-ion battery. The carbon nanotubes serve as the nucleation centers and induce the growth of potassium vanadate, which effectively decreases the agglomeration of potassium vanadate nanobelts. Besides, the characteristic 3D interconnected network structure provides a continuous conductive path with more adsorption sites for sodium ions. Therefore, KV3 O8-x @CNTs·2.5H2 O exhibits high specific surface area and fast kinetics accordingly showing excellent electrochemical performance. The capacity can reach 138.9 mAh g −1 at 20 mA g −1 and keep a high retention rate of 85% at 2 A g −1 . Beneficial from the layered morphology, the composite exhibits a highly stable and reversible change during the repeated charge/discharge processes, and thence a high capacity retention rate of 81% after 240 cycles at 100 mA g −1 can be achieved. This work presents a facile approach for further exploration of vanadate-based cathode materials in the field of sodium-ion batteries.