Preparation and performance of Co-doped Ni-rich cathode material LiNi0.9Mn0.1O2
By coprecipitation method and two-stage calcination process,the Ni-rich cathode material LiNi0.9Mn0.1O2 was prepared and the optimal final calcination temperature and the optimal Co doping content were investigated.The results show that the optimal calcination temperature is 740℃and the optimal Co doping content is 10%(mole fraction).The prepared cathode material LiNi0.8Co0.1Mn0.1O2 possesses the intrinsic layered structure.Its layered structure is more orderly and its mixing degree of Li+/Ni2+is the lowest.The electrochemical performances are also the best with the first discharge specific capacity of 250.92 mA·h/g at 0.1C current density,the capacity retention rate of 91.82%after 100 cycles and the specific capacity of 200.55 mA·h/g at 5C.Co doping can stabilize the layered structure,reduce the mixing degree of Li+/Ni2+and improve the electrochemical performances of Ni-rich cathode material.
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