Synthesis and Electrochemical Performance of Ti 4＋ Doped LiV 3O 8

溶胶凝胶法合成了层状的LiTiyV3-0.8yO8（y=0, 0.04, 0.06, 0.08）正极材料,这些材料因为掺杂Ti量的不同，而具有了不同的形貌特征（形状，粒径，比表面积）以及电化学性质（首次充放电容量， 循环容量等）。XRD，SEM, CV，及充放电测试对该正极材料的结构和电化学性能进行了表征，结果表明当y=0.04时，该正极材料拥有最高的首次放电容量（348.9mAhg-1）和最好的容量循环性能。

Synthesis and Electrochemical Performance of Ti4+ Doped LiV3O8

Layered LiTi_yV_3?0.8yO₈ cathode materials with y=0, 0.04, 0.06, 0.08 were prepared by a sol‐gel process following a calcination at 350°C in air for 16 h, and show differences in morphological properties (shape, particle size and specific surface area) and electrochemical properties (first charge profile, reversible capacity and rate capability). The LiTi_yV_3?0.8yO₈ powders were characterized by means of X‐ray diffraction (XRD), charge/discharge cycling, cyclic voltammetry (CV), and scanning electron microscopy (SEM). LiTi_yV_3?0.8yO₈ was crystallized to a well layered structure. Its initial specific discharge capacity was higher than that of pristine material. When y=0.04, the sample showed the highest initial discharge capacity of 348.9 mAh·g^?1 at a current density of 60 mA·g^?1 in the voltage range 1.8–4.0 V, and also higher discharge capacity and better cycle ability.