College of Materials and Chemical Engineering, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China.
Phys Chem Chem Phys. 2015 Sep 7;17(33):21442-7. doi: 10.1039/c5cp03435c. Epub 2015 Jul 29.
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.
首次研究了作为锂离子电池阳极的 CuV2O6 的充放电机制，该机制表明在放电过程中存在一个相变，最初涉及 LiV2O5 和 Cu3V2O8 的形成，随后从 Cu3V2O8 到 LixV2O5 和 CuO 的转变，锂离子插入 LiV2O5 中，随后 CuO 还原为 Cu。Cu3V2O8 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 CuV2O6/天然石墨电极，该电极表现出优异的电化学性能。在 110 mA g(-1)的特定电流下，其初始放电和充电容量分别为 725 和 453 mA h g(-1)，200 次循环后仍保持 537 和 533 mA h g(-1)。
