In this paper, a potassium-deficient K0.66V3O8 with nanobelt morphology was synthesized by a facileand 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 nanobeltsshow a width of ~80 nm and a length of less than one micrometer. Cyclic voltammetry (CV) testindicates good reversible Li ion insertion/extraction behavior. When used as a cathode material for Li- -1 ion battery, the nanobelts exhibit a high initial discharge capacity of 268.9 mAh g during 1.5~4.0 V at-1 -1 15 mA g . After capacity fading in the first several cycles, it maintains the capacity of 180 mAh g .-1 -1 At 75 mA g , the K0.66V3O8 nanobelts still show the reversible capacity of 197.5 mAh g with thecapacity retention of 70.8% after 25 cycles.
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机译：本文通过一种简便而大规模的水热法合成了一种具有纳米带形态的缺钾K0.66V3O8，并研究了其作为锂离子电池正极材料的电化学性能。如扫描电子显微镜（SEM）所示，纳米带的宽度约为80纳米，长度小于1微米。循环伏安法（CV）表明良好的可逆锂离子插入/萃取行为。当用作Li -1离子电池的正极材料时，纳米带在-1 -1 15 mA g下1.5〜4.0 V时具有268.9 mAh g的高初始放电容量。在最初的几个循环中容量下降之后，它保持了180 mAh g的容量。-1-1在75 mA g时，K0.66V3O8纳米带仍显示出197.5 mAh g的可逆容量，在25个循环后的容量保持率为70.8％。 。
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