微波烧结法制备Li_(1+x)V_3O_8的电化学性能

The electrochemical characteristics of Li_(1+x)V_3O_8 synthesized by a microwave sintering method

以LiOH·H2O和NH4VO3为原料,用微波烧结法首次制得圆球形和棒状的Li1+xV3O8。充放电实验、循环伏安实验、XRD、FTIR和TEM等现代手段被用于研究微波对样品充放电性能的改善作用。结果表明,微波处理将导致样品的XRD衍射线出现明显的宽化现象,样品的形貌可能是影响样品电化学性能的重要因素。低温固相烧结并结合微波烧结制得的固相微波烧结样(Lw)的第一循环的容量达到323mAh/g,第40循环的容量186.6mAh/g,放电态存放1个月后的容量达到210mAh/g,表现出优秀的放电性能。

The mixture of LiOH·H2O and NH4VO3 were used to synthesize Li1+xV3O8 sample with a ball and a club-shaped by a microwave sintering method for the first time. The charge/discharge, cyclic voltammogram, XRD, FTIR and TEM were employed to study how the microwave improves the rechargeability and stored characteristics. Experimental result showed the XRD diffraction patterns become wide while samples sintered by microwave. A Lw sample, synthesized by the combination method of the solid phase and the microwave sintering at 480 ℃, possesses a capacity of 323 mAh/g at the 1 st cycle and 186.5 mAh/g at the 40 th cycle. After charged and discharged and stored the sample in the discharged state for a month, Lw sample still possesses a capacity of 210 mAh/g in the 1st cycle. Therefore, microwave can obviously improve the electrochemical characteristics of Li1+xV3O8 sample.