二氰基二硫纶·5-硝基邻菲咯啉合钴(Ⅱ)的电子光谱及理论研究

报道了配合物Co(mnt)(5 NO2 phen) 在几种溶剂中的电子光谱,用RHF SCF MO理论的PM3方法进行了几何构型优化,研究了配合物基态和激发态的电子结构.由ZINDO/S方法的组态相互作用(CI)计算给出了理论光谱,计算结果与实测谱吻合较好.研究发现配合物紫外区的吸收带本质上属于配体的πb→π* 跃迁,可见光区400~500 nm存在本质上属于配体5 NO2 phen到配体mnt2-的荷移跃迁.     

锂离子电池正极材料LiNi1-xCoxO2的合成及电化学性能研究

LiNi_1-xCo_xO₂ cathode materials for lithium ion batteries were synthesized by the co-precipitation and solid-state reaction methods with LiOH·H₂O, Ni(NO₃)₂·6H₂O and Co(NO₃)₂·6H₂O as raw materials. The materials were characterized by XRD, SEM and electrochemical tests. The results showed that synthesized cathode materials were with layered structure similar to α-NaFeO₂ and uniform morphology and nearly normal grain size distribution and better electrochemical performance when x was 0.18. The first charge and discharge capacity of the cathode material was 224.3 mAh·g^-1 and 194.2 mAh·g^-1, respectively. 88.5% of the first discharge capacity remained at the 20th cycle.