The charge/discharge mechanism and electrochemical performance of CuV2O6 as a new anode material for Li-ion batteries
The charge/discharge mechanism and electrochemical performance of CuV2O6 as a new anode material for Li-ion batteries
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新型锂离子电池负极材料CuV2O6的充放电机理及电化学性能
DOI：
10.1039/c5cp03435c
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发表时间：
2015-01-01
影响因子：
3.3
通讯作者：
Zhang, Lulu
中科院分区：
文献类型：
--
作者：
Ma, Jianjun;Ni, Shibing;Zhang, Lulu
首次研究了CuV_2O_6作为锂离子电池负极的充放电机理，提出了CuV_2O_6在放电过程中的相变过程，即先形成LiV_2O_5和Cu_3V_2O_8，然后由Cu_3V_2O_8转变为Li_xV_2O_5和CuO，再由LiV_2O_5嵌入锂离子，最后由CuO还原为Cu。Cu 3V 2 O 8的相变伴随着非晶化过程，该过程在随后的放电和充电过程中得以维持。制备了以海藻酸钠为粘结剂的CuV 2 O 6/天然石墨电极，该电极具有上级电化学性能。在110 mA g（-1）的特定电流下，其分别提供725和453 mA h g（-1）的初始放电和充电容量，在200次循环后保持537和533 mA h g（-1）。
The charge/discharge mechanism of CuV2O6 as the anode for Li-ion batteries is studied for the first time, suggesting a phase transition in discharging, which initially involves the formation of LiV2O5 and Cu3V2O8, the subsequent transition from Cu3V2O8 to LixV2O5 and CuO, the insertion of lithium ions into LiV2O5, and later the reduction of CuO into Cu. The phase transition of Cu3V2O8 is accompanied by an amorphization process, which is maintained in the subsequent discharging and charging processes. The CuV2O6/natural graphite electrode with a sodium alginate binder is prepared, which shows superior electrochemical performance. At a specific current of 110 mA g(-1), it delivers initial discharge and charge capacities of 725 and 453 mA h g(-1), respectively, maintaining 537 and 533 mA h g(-1) after 200 cycles.