钛掺杂对LiNi_(0.75)Co_(0.25)O_2结构与性能的影响(英文)

Effect of Ti Doping on the Structure and Performance of LiNi_(0.75)Co_(0.25)O_(2)

应用溶胶-凝胶法合成LiNi(0.75-x)Co0.25TixO2(x=0,0.1,0.25)系列正极材料,其结构、形貌、粒度、电化学性能由TG、XRD、SEM和电池充放电测试表征研究表明,材料的电化学性能与钛掺杂量密切相关.在钴含量不变的情况下,随着Ti含量(x)的增加,材料由六方层状结构逐渐向立方结构转变,x=0.25时,出现了立方相与六方相共存.根据实验和理论计算结果简要讨论了钛掺杂对正极材料LiNi0.75Co0.25O2结构和电化学性能的影响.

In this study, a series of Co-doped compounds with the formula of LiNi（0.75-x）Co0.25TixO2 （x = 0,0.1 ,0.25 ）was synthesized by using sol-gel method. Their structure, particle size, electrochemical properties were studied by TG,XRD,SEM and electrochemical tests. It was shown that the structure of materials changed from a hexagonal layered structure to a cubic structure as the x value increased. In particular, a mixture of hexagonal and cubic structure was presented at x = 0.25. The electrochemical performance of the materials depended strongly on the amount of Ti doping. Possible effects on the structure and performance of LiNi（0.75-x） Co0.25TixO2 due to Ti doping are briefly discussed based upon the experiment and computational results.