Synthesis and performance of single-crystal material LiNi0.5Co0.2Mn0.3O2
Ternary cathode material LiNi0.5Co0.2Mn0.3O2(NCM523) is widely used in power batteries due to its high discharge capacity and good cycle stability as well as thermal stability.The formation of intergranular microcracks in traditional polycrystalline materials during the charge-discharge process can affect their electrochemical performance.A single-crystallization strategy is used to synthesize NCM523 cathode material with plate characteristics and microscale single-crystal,and the electrochemical performance is tested.The cathode material exhibits good cycle stability in different voltage ranges at 0.2 C rate.The initial specific discharge capacity,initial Coulombic efficiency and capacity retention after 100 cycles in 3.0-4.3 V are 161.4 mAh/g,86.5％ and 89.1％,respectively.When the voltage is 3.0-4.5 V,the values are 176.7 mAh/g,81.4％ and 87.3％,respectively.When cycled in 2.5-4.3 V,the material delivers specific discharge capacities of 152.4 mAh/g,140.4 mAh/g,123.2 mAh/g and 108.6 mAh/g at 0.5 C,1.0 C,2.0 C and 3.0 C rate,respectively,showing a good rate capability.
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