一种合成LiNiO2正极材料新工艺的研究

在空气气氛中,采用固相法与熔融盐法相结合的新工艺,制备出了锂离子蓄电池正极材料LiNiO2。对LiNO3-LiOH和Ni(OH)2混合粉体进行了差热-热重分析(DTA-TG)。通过对制备的LiNiO2进行X射线衍射(XRD)分析表明:制得的LiNiO2具有!-NaFeO2结构,且晶型完整。电性能测试表明:在0.5mA/cm2的充放电电流密度和2.7～4.2V的电压范围内,其放电比容量可达138.5mAh/g,库仑效率达82%。循环20次后,放电比容量仍达114.6mAh/g。研究表明采用此工艺,能制备出电化学性能良好的LiNiO2正极材料。

Investigation of LiNiO2 prepared by a novel method

Cathode material LiNiO2 for lithium ion battery was prepared employing a novel technology solid state reaction combined with molten salt method.In air atmosphere,the mixture powders of molten salt LiNO3,LiOH2O and Ni(OH)2 were analyzed by the method of DTA-TG.XRD results show the prepared LiNiO2 has perfect structure of -NaFeO2.Electrochemical property tests testify that for charge-discharge current density of 0.5 mA/cm2 and charge-discharge voltage of 2.7 V and 4.2 V,the initial discharge specific capacity of prepared LiNiO2 are 138.5 mAh/g.The coulomb efficiency is 82%.The discharge specific capacity remains 114.6 mAh/g after 20 cycles.It is indicated that the cathode material LiNiO2 with good electrochemical property can be prepared by this technology.