Ma Hua, Zhang Shaoyan, Ji Weiqiang, Tao Zhanliang, Chen Jun
Key Laboratory of Energy-Material Chemistry (Tianjin) and Engineering Research Center of Energy Storage & Conversion (Ministry of Education), Chemistry College, Nankai University, Tianjin 300071, People's Republic of China.
J Am Chem Soc. 2008 Apr 16;130(15):5361-7. doi: 10.1021/ja800109u.
We report on the synthesis, characterization, and electrochemical lithium intercalation of alpha-CuV2O6 nanowires, mesowires, and microrods that were prepared through a facile hydrothermal route. The diameters of the as-synthesized alpha-CuV2O6 nanowires, mesowires, and microrods were about 100 nm, 400 nm, and 1 microm, respectively. It was found that by simply controlling the hydrothermal reaction parameters, such as the reagent concentration and the dwell time, the transformation of microrods to nanowires was readily achieved via a "ripening-splitting" mechanism. Electrochemical measurements revealed that the as-prepared alpha-CuV2O6 nanowires and mesowires displayed high discharge capacities (447-514 mAh/g at 20 mA/g and 37 degrees C) and excellent high-rate capability. In particular, the alpha-CuV2O6 nanowires showed capacities much higher than those of alpha-CuV2O6 mesowires, microrods, and bulk particles. The mechanisms for the electrochemical lithium intercalation into the alpha-CuV2O6 nanowires were also discussed. From the Arrhenius plot of lithium intercalation into alpha-CuV2O6 nanowires, the activation energies were calculated to be 39.3 kJ/mol at 2.8 V (low lithium uptake) and 35.7 kJ/mol at 2.3 V (high lithium uptake). This result indicates that the alpha-CuV2O6 nanowires are promising cathode candidates for primary lithium batteries used in long-term implantable cardioverter defibrillators (ICD).
我们报道了通过简便的水热法制备的α-CuV₂O₆纳米线、中观线和微棒的合成、表征及电化学锂嵌入性能。所合成的α-CuV₂O₆纳米线、中观线和微棒的直径分别约为100纳米、400纳米和1微米。研究发现，通过简单控制水热反应参数，如试剂浓度和停留时间，可经由“熟化-分裂”机制轻松实现微棒向纳米线的转变。电化学测量结果表明，所制备的α-CuV₂O₆纳米线和中观线展现出高放电容量（在20 mA/g和37℃下为447 - 514 mAh/g）以及优异的高倍率性能。特别地，α-CuV₂O₆纳米线的容量远高于α-CuV₂O₆中观线、微棒和块状颗粒。文中还讨论了α-CuV₂O₆纳米线电化学锂嵌入的机制。根据锂嵌入α-CuV₂O₆纳米线的阿仑尼乌斯曲线，计算得出在2.8 V（低锂摄取量）时的活化能为39.3 kJ/mol，在2.3 V（高锂摄取量）时为35.7 kJ/mol。这一结果表明，α-CuV₂O₆纳米线是用于长期植入式心脏复律除颤器（ICD）的一次锂电池的有前景的阴极候选材料。
