喷雾包覆对三元单晶正极材料高电压下高温电化学性能的影响  

Effect of Spray Coating on the High Temperature Electrochemical Performance of Single Crystal NMC532 Cathode Materials at High Voltage

作　　者：靳佳 魏进平 Jin Jia;Wei Jinping(Tianjin Guoan Mengguli New Materials Science and Technology Co.,Ltd.,Tianjin 301800,China;Tianjin Enterprise Key Laboratory of Key Materials and Technology for Solid State Batteries,Tianjin 300182,China;Institute of New Energy Materia/Chemistry,Nankai University,Tianjin 300350)

机构地区：[1]天津国安盟固利新材料科技股份有限公司,天津301800 [2]天津市固态电池关键材料与技术企业重点实验室,天津300182 [3]南开大学新能源材料化学研究所,天津300350

出　　处：《南开大学学报（自然科学版）》2022年第1期99-106,共8页Acta Scientiarum Naturalium Universitatis Nankaiensis

摘　　要：采用高温固相法制备三元单晶正极材料LiNi0.5Mn0.3Co0.2O2(NMC532),并采用碳酸锆铵对其进行表面喷雾包覆,通过XRD、场发射电子扫描显微镜、能量色散光谱仪、电池充放电、电化学阻抗和循环伏安测试研究了碳酸锆铵喷雾包覆对材料结构和电化学性能的影响.电化学性能测试表明,碳酸锆铵喷雾包覆可有效改善材料的高温循环性能,保持首圈库仑效率基本不变,但会牺牲材料的首圈放电比容量.相比于未喷雾包覆的三元单晶NMC532样品,喷雾包覆量为0.3%的NMC532样品,具有最优异的电化学性能,在55℃0.3C下的首次放电比容量为185.2 m Ah/g,库仑效率88.2%;在1.0C下经80次循环后容量保持率为95.5%.The NMC532 cathode material was prepared by a solid state calcination method,and the bare material was then spray coated by Ammonium zirconium carbonate(AZC).Influence of the amount of AZC on the structure and electrochemical properties of cathode material was investigated by X-ray diffraction(XRD),field emission scanning electron microscope(FE-SEM),energy dispersive spectroscopy mapping(EDS mapping),electrochemical impedance spectroscopy(EIS),cyclic voltammetry(CV)and electrochemical performance tests.EDS mapping characterization proved that the NMC532 particles were successively but inhomogeneously coated by a nanoscale coating layer.Spray coating of AZC effectively improved the high temperature cycling performance,maintained the coulombic efficiency,however sacrificed a little discharge capacity of the material.Compared with uncoated material,the material spray coated with 0.3%AZC showed better electrochemical performance,which exhibited initial discharge capacity of 185.2 m Ah/g at 0.3 C,coulombic efficiency of 88.2%,and specific capacity retention of 95.5%after 80 cycles at 1.0 C.

关 键 词：锂离子电池 NMC532 喷雾包覆 高电压 高温循环性能 

分 类 号：TM912[电气工程—电力电子与电力传动]