A Na3V2(PO4)3 cathode material for use in hybrid lithium ion batteries.
A Na3V2(PO4)3 cathode material for use in hybrid lithium ion batteries.
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DOI：
10.1039/c3cp52308j
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发表时间：
2013-08
期刊：
影响因子：
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通讯作者：
Weixin Song;Xiaobo Ji;Chengchi Pan;Yirong Zhu;Qi-yuan Chen;C. Banks
中科院分区：
文献类型：
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作者：
Weixin Song;Xiaobo Ji;Chengchi Pan;Yirong Zhu;Qi-yuan Chen;C. Banks
采用碳热还原法制备了NASICON结构的Na 3V 2（PO 4）3正极材料，并将其应用于含锂电解质和负极的混合离子电池中。首次研究了三维开放骨架Na_3V_2（PO_4）_3在这一复杂体系中的离子输运机制。放置时间对离子交换有很大影响，例如，1小时电池的比容量为128 mA h g（-1），而24小时电池的比容量为148 mA h g（-1），与现有文献报道的锂离子电池相比，其倍率和循环性能有所改善。在混合离子系统中，离子交换过程可能发生在菱形结构中的两个Na（2）位之间。NaLi_2V_2（PO_4）_3可以通过离子迁移产生，因为Na（1）位的Na（+）是固定的，三个Na（2）位可以用来容纳进入的碱金属离子; Li（x）Na（y）V_2（PO_4）_3可以在Na（2）位的空位被占据时产生，这取决于施加的电压范围。报告的方法和功率特性大于以前报告的。
A NASICON-structure Na3V2(PO4)3 cathode material prepared by carbothermal reduction method is employed in a hybrid-ion battery with Li-involved electrolyte and anode. The ion-transportation mechanism is firstly investigated in this complicated system for an open three-dimensional framework Na3V2(PO4)3. Ion-exchange is greatly influenced by the standing time, for example, the 1 hour battery presents a specific capacity of 128 mA h g(-1) while the 24 hour battery exhibits a value of 148 mA h g(-1) with improved rate and cycling performances over existing literature reported Li-ion batteries. In the hybrid-ion system, an ion-exchange process likely takes place between the two Na(2) sites in the rhombohedral structure. NaLi2V2(PO4)3 could be produced by ion-transportation since the Na(+) in the Na(1) site is stationary and the three Na(2) sites could be used to accommodate the incoming alkali ions; Li(x)Na(y)V2(PO4)3 would come out when the vacant site in Na(2) was occupied depending on the applied voltage range. The reported methodology and power characteristics are greater than those previously reported.