α-CuV2O6 nanowires:: Hydrothermal synthesis and primary lithium battery application
α-CuV2O6 nanowires:: Hydrothermal synthesis and primary lithium battery application
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DOI：
10.1021/ja800109u
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发表时间：
2008-04-16
影响因子：
15
通讯作者：
Chen, Jun
中科院分区：
文献类型：
--
作者：
Ma, Hua;Zhang, Shaoyan;Chen, Jun
我们报告的合成，表征和电化学嵌锂的α-CuV 2 O 6纳米线，介线，和微米棒，通过一个简单的水热路线制备。所合成的α-CuV 2 O 6纳米线、中间线和微米棒的直径分别约为100 rim、400 nm和1 μ m。结果发现，通过简单地控制水热反应参数，如试剂浓度和停留时间，微米棒到纳米线的转变很容易实现通过“成熟分裂”机制。电化学测试表明，所制备的α-CuV 2 O 6纳米线和中间线具有较高的放电容量（20 mA/g和37 ℃时为447-514 mAh/g）和优异的高倍率性能。特别是，α-CuV 2 O 6纳米线表现出的容量远远高于那些α-CuV 2 O 6 mesowires，microrods，和散装颗粒。对电化学嵌锂的机理进行了讨论。根据锂嵌入到α-CuV 2 O 6纳米线中的Arrhenius图，计算出活化能在2.8V（低锂吸收）下为39.3kJ/mol，在2.3V（高锂吸收）下为35.7kJ/mol。该结果表明，α-CuV 2 O 6纳米线是用于长期植入式心律转复除颤器（ICD）的一次锂电池的有希望的阴极候选物。
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 rim, 400 nm, and 1 mu m, 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).