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共沉淀法合成了层状Li1+xNi0.8Co0.2O2(x=0和0.05),采用XRD和电化学方法对其进行了研究。与LiNi0.8Co0.2O2相比,Li1.05Ni0.8Co0.2O2有较高的放电容量和较差的循环性能。与LiNi0.8Co0.2O2放电容量微分曲线相似,Li1.05Ni0.8Co0.2O2在4.15 V存在负峰,随着循环次数的增加,4.15 V负峰峰位明显向左移。与LiNi0.8Co0.2O2放电容量微分曲线不同,层状结构Li1.05Ni0.8Co0.2O2的4.15 V负峰峰高随循环次数的增加而增高,循环过程促进了Li1.05Ni0.8Co0.2O2结构转变。
Layered Li1 + xNi0.8Co0.2O2 (x = 0 and 0.05) was synthesized by coprecipitation method and characterized by XRD and electrochemical methods. Compared with LiNi0.8Co0.2O2, Li1.05Ni0.8Co0.2O2 has higher discharge capacity and poor cycle performance. Similar to the discharge curve of LiNi0.8Co0.2O2, the Li1.05Ni0.8Co0.2O2 has a negative peak at 4.15 V, and the negative peak at 4.15 V shifts to the left significantly with the increase of the number of cycles. Different from the curve of discharge capacity of LiNi0.8Co0.2O2, the 4.15 V negative peak height of the layered structure Li1.05Ni0.8Co0.2O2 increases with the increase of the number of cycles, and the cycling process promotes the structural transformation of Li1.05Ni0.8Co0.2O2 .