Enhanced lithium storage performance of V(2)O(5) with oxygen vacancy.

Enhanced lithium storage performance of V(2)O(5) with oxygen vacancy.
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氧空位增强V2O5的储锂性能

DOI:
10.1039/c8ra07326k
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发表时间:
2018-11-23
期刊:
影响因子:
3.9
通讯作者:
Li, Yanwei
Li, Yanwei
中科院分区:
化学3区
文献类型:
--
作者:
Sun, Yinlu;Xie, Zhiping;Li, Yanwei

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采用简单的溶胶-凝胶法和冷冻干燥技术,结合真空退火工艺制备了具有高V4+含量的正交相V2 O 5纳米片(V-V2 O 5)。XPS测试表明,V-V2 O 5样品中V4+的含量为7.4%,远高于空气中退火的V2 O 5样品中V4+的含量(4.7%)。与在空气中退火的V2 O 5相比,V-V2 O 5样品在作为锂离子电池正极活性材料进行评价时具有更好的循环稳定性、更高的储锂活性和更小的电化学反应电阻。例如,V-V2 O 5和V2 O 5电极在200 mA g−1下循环100次后的比容量分别为224.7和199.2 mA h g−1;在3 A g−1下循环200次后的比容量分别为150和136.7 mA h g−1。采用简单的溶胶-凝胶法和冷冻干燥技术,结合真空退火工艺制备了具有高V4+含量的正交相V2 O 5纳米片(V-V2 O 5)。
Orthorhombic phase V2O5 nanosheets with a high V4+ content (V-V2O5) have been fabricated via a facile sol–gel method and freeze-drying technology followed with a vacuum annealing process. XPS tests demonstrated that the content of V4+ in the as-prepared V-V2O5 sample was 7.4%, much higher than that (4.7%) in the V2O5 sample annealed in air. Compared with the V2O5 annealed in air, the V-V2O5 sample exhibited better cycling stability, higher lithium storage activity, and smaller electrochemical reaction resistance when evaluated as a cathode active material for lithium ion batteries. For example, the specific capacity of the V-V2O5 and V2O5 electrodes after 100 cycles at 200 mA g−1 are 224.7 and 199.2 mA h g−1, respectively; after 200 cycles at 3 A g−1 are 150 and 136.7 mA h g−1, respectively. Orthorhombic phase V2O5 nanosheets with a high V4+ content (V-V2O5) have been fabricated via a facile sol–gel method and freeze-drying technology followed with a vacuum annealing process.
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