硅负极添加剂对锂离子电池的影响

选用乙炔黑(AB)、SuperP、VulcanXC-72和BP2000四种导电剂, 研究其物化性能及含量对硅电极电化学性能的影响; 探讨了粘合剂种类和用量对硅电极电化学性能的影响。采用场发射扫描电子显微镜对硅电极的形貌进行表征; 采用恒流充放电测试及循环伏安法对硅电极的电化学性能进行测试。结果表明, 导电剂SuperP具有良好的导电性、适中的比表面积(75.8 m²/g)和颗粒尺寸(39.2 nm), 有利于提高硅负极的循环性能及倍率循环性能。采用15wt%的导电剂 SuperP与15wt%的粘合剂CMC所制备的电极循环50次后可逆比容量保持在1143.8 mAh/g。

Effect of Silicon Anode Additives on Lithium Ion Batteries

Silicon anode of lithium ion batteries was fabricated with different binders and conductive additives (acetylene black, SuperP, VulcanXC-72, BP2000), and the electrochemical performance was investigated in detail. The effect of morphology and addition amount of conductive additives on the electrochemical performance of silicon electrode were investigated. Then, the appropriate type and content of binder in the silicon electrode was optimized. The morphology of silicon electrodes were characterized by scanning electron microscope(SEM). Electrochemical performances of the silicon electrodes were measured by constant current charge-discharge and cyclic voltammetry(CV). The results shows that SuperP hasuperPlectrical conducitivity and good electrical conductivity, a suitable surface area of 75.8 m²/g and average particle size of 39.24 nm, which can improve cycling performance and rate performance of the silicon electrode. With 15wt% SuperP and 15wt% CMC, the electrode exhibits a reversible capacity of 1143.8 mAh/g after 50 cycles.