单晶材料LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)的合成与性能  

Synthesis and performance of single-crystal material LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)

作　　者：王洪波 刘燕 孙静静 刘园 朱智强 WANG Hongbo;LIU Yan;SUN Jingjing;LIU Yuan;ZHU Zhiqiang(School of Materials Science and Engineering,Henan Institute of Technology,Xinxiang,Henan 453000,China;College of Chemistry and Chemical Engineering,Hunan University,Changsha,Hunan 410082,China)

机构地区：[1]河南工学院材料科学与工程学院,河南新乡453000 [2]湖南大学化学化工学院,湖南长沙410082

出　　处：《电池》2024年第4期482-486,共5页Battery Bimonthly

摘　　要：三元正极材料LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)具有放电容量高、循环稳定性和热稳定性好的特点,在动力电池中应用广泛。传统多晶材料在充放电过程中会形成晶间微裂纹,影响电化学性能。采用单晶化策略,合成具有片状特征、微米单晶结构的NCM523正极材料,并进行电化学性能测试。在0.2 C倍率下,正极材料在不同电压区间的循环稳定性均较好:电压为3.0~4.3 V时,材料的首次放电比容量、首次库仑效率和100次循环容量保持率分别为161.4 mAh/g、86.5%和89.1%;电压为3.0~4.5 V时,分别为176.7 mAh/g、81.4%和87.3%。材料具有较好的倍率性能,在2.5~4.3 V循环,在0.5 C、1.0 C、2.0 C和3.0 C倍率下的放电比容量分别可达152.4 mAh/g、140.4 mAh/g、123.2 mAh/g和108.6 mAh/g。Ternary cathode material LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(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.

关 键 词：LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523) 单晶 三元材料 共沉淀 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]