Preparation and Electrochemical Investigation of Na and Cl Co-Doped LiNi0.5Co0.2Mn0.3O2 Cathode Materials
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A(2023)
Abstract
LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode materials are susceptible to irreversible phase changes and surface side reactions between electrode materials and electrolyte during charging and discharging, which represent a severe danger to the safety and electrochemical performance of batteries. Li1.06-xNaxNi0.5Co0.2Mn0.3O2-yCly cathode materials co-doped with Na+ and Cl- were prepared by a simple co-precipitation method. The effects of crystal structure, morphology and electrochemical properties were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and charge-discharge performance tests. The results show that the doping of Na+ and Cl- reduces the mixing of cations and expands the diffusion channels of Li+. Currently, the doped 1%-NCM has a high charge-discharge capacity and the best cycling performance (187.56 mA h g(-1) at 1 C with the highest capacity retention at 76.29% after the first cycle). After 50 cycles, the specific capacity retention was 138.33 mA h g(-1), which increased the capacity retention by 18.58% compared with the unmodified material, indicating that the co-doping of anions and cations improved the Li+ de-embedding ability as well as the specific capacity.
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Key words
LiNi0.5Co0.2Mn0.3O2,lithium-ion battery,cathode material,doping,electrochemical
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