一维Na2/3Ni1/3Co1/3Mn1/3O2正极材料的制备及其电化学性能研究  

Synthesis of one-dimensional NaNiCoMnO composite cathode material and study on its electrochemical performance

作　　者：符军瑞 黄小琴 陈飞 FU Jun-rui;HUANG Xiao-qin;CHEN Fei(School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009

出　　处：《现代化工》2020年第12期173-176,180,共5页Modern Chemical Industry

摘　　要：在水-乙醇溶液体系中通过温和的共沉淀反应成功制备了一维(Ni1/3Co1/3Mn1/3) C2O4微米棒前驱体,通过混入碳酸氢钠及后期高温烧结得到Na2/3Ni1/3Co1/3Mn1/3O2微米棒钠离子电池正极材料。通过XRD、FESEM、TEM及电化学测试等手段对材料的结构、形貌、组成以及电化学性能进行了分析表征。结果表明,Na2/3Ni1/3Co1/3Mn1/3O2微米棒正极材料表现出优异的循环性能和倍率性能,在0.1 C倍率下,经过115次充放电循环后的容量保持率为70.0%;而在纯水体系中通过共沉淀法制备的Na2/3Ni1/3Co1/3Mn1/3O2微米颗粒正极材料的容量保持率仅为39.4%;同时在高倍率下微米棒的放电比容量也有较大优势。A mild co-precipitation route in a water-ethanol solution system is successfully adopted to synthesize onedimensional( Ni1/3Co1/3Mn1/3) C2O4 micro-rod precursor,which is further mixed with Na HCO3 afterwards.After sintered in air under high temperature,one-dimensional Na2/3Ni1/3Co1/3Mn1/3O2 micro-rod cathode material for sodium ion battery is successfully synthesized.The structure,morphology,composition and electrochemical properties of the as-prepared materials are characterized by XRD,FESEM,TEM and electrochemical tests.The results show that Na2/3Ni1/3Co1/3Mn1/3O2 micro-rod cathode material exhibits more stable cycle performance and discharge capacity at high rate,the capacity retention of Na2/3Ni1/3Co1/3Mn1/3O2microd is 70.0% after 115 cycles at 0.1 C while that of Na2/3Ni1/3Co1/3Mn1/3O2 microparticle is only 39.4%.

关 键 词：钠离子电池 共沉淀 正极材料 电化学 

分 类 号：TM912.9[电气工程—电力电子与电力传动]