LiFePO_4/MWNTs/BC复合材料的制备及电化学性能

Synthesis and Electrochemical Performance of LiFePO_4/MWNTs/BC Composite

用直接烧制法制备了竹炭(BC)材料,并采用恒流充放电、循环伏安(CV)和塔菲尔曲线研究了后期掺BC对LiFePO4/MWNTs电化学性能的影响。结果表明,后期掺杂5wt%BC时,所得LiFePO4/MWNTs/BC样品具有最佳的电化学性能;在0.1 C倍率下的放电容量为117 mAh·g-1,但与LiFePO4/MWNTs材料相比,后期掺杂BC对LiFePO4/MWNTs的电化学性能改善不明显。

Bamboo charcoal （BC） was synthesized by direct calcination reaction. The effects of BC adding during the later stage on the behaviors of LiFePO4/MWNTs were investigated by galvanostatic current charge-discharge, cyclic voltammetry （CV） and Tafel curves. The results show that as-prepared LiFePO4/MWNTs/BC composite with BC 5wt% exhibits the best electrochemical performance. The initial discharge specific capacity is 117 mAh. g-1 at 0.1 C. Compared with the composite, the as-prepared LiFePO4/MWNTs/BC sample doped with BC during the later stage has little effects on the electrochemical properties of the composite.