Abstract
The Li(Ni0.5Co0.2Mn0.3)1-xZnxO2 (NCMZ) cathode materials are prepared by high temperature solid-state reaction. The characterization of structure shows that Zn2+ entered into the lattice structure and replaced the transition metals. Electrochemical tests show Zn doping can improve discharge capacity and cycling retention of Li(Ni0.5Co0.2Mn0.3)O2 (NCM) by reducing polarization and voltage attenuation. The capacity of Li(Ni0.5Co0.2Mn0.3)0.95Zn0.05O2 (NCMZ0.5) at 5 C (1 C = 160 mAh/g) can reach 125.9 mAh/g, much higher than that of NCM (98 mAh/g). Under high-cutoff voltage (4.5 V), the capacity retention of NCMZ0.5 increased by 18.4% compared to NCM at 1 C after 100 cycles. The electrochemical properties of NCM/graphite have also been greatly improved by Zn doping.
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