Potassium Vanadate Nanobelt as a High-Capacity Cathode Material for Li-ion Battery

作者：Huang, Xiaobing^*; Dai, Bo; Xu, Guoqing; He, Xiaoyu; Zhou, Shibiao; Chen, Yuandao; Liu, Beiping

来源：International Journal of Electrochemical Science, 2014, 9(11): 6640-6647.

• Li-ion battery
• K0.67V3O8
• Nanobelt
• Hydrothermal method
• Electrochemical performance

In this paper, a potassium-deficient K0.66V3O8 with nanobelt morphology was synthesized by a facile and large-scale hydrothermal method and its electrochemical performance as cathode material for Li-ion battery was investigated. As indicated by the scanning electron microscopy (SEM), the nanobelts show a width of similar to 80 nm and a length of less than one micrometer. Cyclic voltammetry (CV) test indicates good reversible Li ion insertion/extraction behavior. When used as a cathode material for Li-ion battery, the nanobelts exhibit a high initial discharge capacity of 268.9 mAh g(-1) during 1.5 similar to 4.0 V at 15 mA g(-1). After capacity fading in the first several cycles, it maintains the capacity of 180 mAh g(-1). At 75 mA g(-1), the K0.66V3O8 nanobelts still show the reversible capacity of 197.5 mAh g(-1) with the capacity retention of 70.8% after 25 cycles.

• 出版日期2014-11
• 单位中南大学; 湖南文理学院