LiNi_(0.85)Co_(0.15)O_2合成和结构与电化学性能关系

Synthesis, Structure and Electrochemical Behavior of LiNi_(0.85)Co_(0.15)O_2

介绍了一种以LiOH·H2 O ,Co2 O3 和Ni2 O3 为原料通过高温法合成LiNi0 .85Co0 .15O2 的方法 .通过XRD和电化学测试对制得的产物进行了表征 ,讨论了合成条件对产物结构的影响以及结构与电化学性能之间的关系 .实验结果表明 ,合成反应温度、Li/Ni/Co摩尔比对LiNi0 .85Co0 .15O2 的结构和电化学性能有较大的影响 ,合成出具有电化学活性的LiNi0 .85Co0 .15O2 需要严格控制反应条件 .本文合成出具有高度结晶层状结构的LiNi0 .85Co0 .15O2 ,Rietveld精化结果表明a =0 .2 874nm ,c=1.4 2 2 9nm ,最大晶胞体积V =0 .10 180nm3 ,其首次放电容量可达 197mA·h/g ,15次循环后 ,其放电容量仍在

LiNi0.85Co0.15O2 compounds were synthesized under various conditio ns by heating a mixture of lithium hydroxide (LiOH·H2O), nickel oxide (Ni2O 3) and cobalt oxide (Co2O3). The products of LiNi0.85~Co0.15~O 2 were characterized by XRD and electrochemical tests. Based on the experiment al results, the influence of synthetic conditions, including temperature and Li/Ni /Co molar ratio on the structure of the products, and the relationship between s tructure and electrochemical behavior are discussed. It is important to control synthetic conditions in order to obtain layered and highly crystallized product. By Rietveld refinement, the as-prepared product shows a=0.2874 nm, c=1 .4229 nm, and maximum cell volume V=0.10180 nm^3 and it also shows a high i nitial discharge capacity of 197 mA·h/g and retention of over 180 mA·h/g after 15 cycles.