原位掺杂的高镍正极材料LiNi_(0.92)Co_(0.039)Mn_(0.038)Zr_(0.003)O_(2)的烧结工艺与性能

Sintering process and performance of in-situ doped Ni-rich cathode material LiNi_(0.92)Co_(0.039)Mn_(0.038)Zr_(0.003)O_(2)

采用共沉淀-固相烧结法成功制备了锆离子原位掺杂的高镍正极LiNi_(0.92)Co_(0.039)Mn_(0.038)Zr_(0.003)O_(2),通过X射线衍射(XRD)、扫描电镜(SEM)、电化学阻抗(EIS)、循环伏安(CV)和恒流充放电测试等探究了不同烧结温度、烧结时间以及锂配比对高镍正极材料的结构及电化学性能的影响。结果表明:当烧结温度为720℃、烧结时间为18 h、锂配比为1∶1.02时,烧结得到的材料具有最佳的电化学性能。在30℃、0.1 C的测试条件下,其首次放电比容量为234.5 mAh·g^(-1),首次库伦效率为89.9%;其在1 C倍率下循环100次后容量保持率为98.6%。

In-situ Zr^(4+)doped Ni-rich cathode LiNi_(0.92)Co_(0.039)Mn_(0.038)Zr_(0.003)O_(2) was successfully synthesized by a co-precipitant corresponding with a solid phase sintering process.The effects of different sintering temperature,sintering time and Li excess on microstructure and electrochemical performance of the Ni-rich cathode material were investigated by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),electrochemical impedance spectroscopy(EIS),cyclic voltammetry(CV)and galvanostatic charge-discharge tests.The results show that when the sintering temperature is 720℃,the sintering time is 18 h,and the lithium excess is 1∶1.02,the sintered material has the best electrochemical performance.Under the test conditions of 30℃and 0.1 C,the initial discharge specific capacity of the Ni-rich cathode material is 234.5 mAh·g^(-1),and the initial Coulombic efficiency is 89.9%.Its capacity retention rate is 98.6%after 100 cycles under 1 C at 30℃.