重点研究了室温固相法Co/Mn氢氧化物包覆Ni(OH)2的机理.采用XRD,SEM,TEM和EDS分析检测手段分析了未包覆与表面包覆材料的结构、形貌和表面成分.TEM实验结果表明,LiNiO2颗粒表面包覆了一薄层化合物;XPS实验结果表明,LiNiO2颗粒表面包覆了Co/Mn元素;SEM和EDS实验结果进一步表明,球形LiNiO2颗粒表面均匀包覆了Co/Mn化合物层.电化学性能测试结果表明,经Co/Mn包覆的LiNiO2正极材料显示了优越的循环性能.
Preparation of Co/Mn-coated LiNiO2 cathode materials by solid-state reaction at room temperature was described. The mechanism of Co/Mn hydrate coated Ni(OH)2 by solid-state reaction at room temperature was investigated. The structure, morphology and surface composition of the uncoated and coated particles were studied with XRD, SEM, TEM and EDS. The TEM result shows a thin film is coated on the surface of LiNiO2 particles. XPS results show Co/Mn elements are coated on the surface of LiNiO2 particles. SEM and EDS results indicate that the coating of Co/Mn layer uniformly covers the surface of spherical LiNiO2 particles. The electrochemical performances results show LiNiO2 cathode materials have a good cycleability by the Co/Mn coating.
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