摘要
通过改进的共沉淀方法成功合成了层状LiNi0.5Mn0.5O2正极材料,并对其结构、形貌以及电化学性能进行了测试。粉末X射线衍射结果表明,合成的LiNi0.5Mn0.5O2材料为层状α-NaFeO2结构,Li+和Ni2+混排很少。扫描电子显微镜结果显示,LiNi0.5Mn0.5O2材料是由形貌规则、大小均匀的亚微米级粒子构筑,粒子粒径分布在200~400 nm。另外,材料表现出了优异的电化学性能:在0.1 C的倍率下,材料的首次放电比容量为206 mAh·g-1,循环60次后,放电比容量为198 mAh·g-1,容量保持率为94.7%。即使在5 C倍率下,材料仍有157 mAh·g-1的首次放电比容量和良好的循环性能。
Abstract： A layered LiNi05 Mn05 02 cathode was successfully synthesized by an improved co-precip- itation method. The structure, morphology and electrochemical performance were investigated. The X-ray diffraction result revealed that the LiNio.sMn0.5 02 sample is a well defined, layered c^-NaFeO2 structure with little interlayer disorder of Li ~ and Ni2 ＋. The SEM results showed that the LiNi0. 5 Mn0. s 02 sample was constructed from uniform, regular, sub-micrometer particles with sizes of 200 -400 nm. In addition, the LiNio.sMno. s 02 cathode exhibited an excellent electrochemical performance. At a rate of 0. 1 C, it de- livered the first discharge capacity of 206 mAh ~ g-1 After 60 cycles, the discharge capacity was 198 mAh ~ g-i, and the capacity retention was as high as 95.6%. Even at a high rate of 5 C, it can still deliver a discharge capacity of 157 mAh ~ g-1 with an excellent recyclable performance.
出处
《黑龙江大学自然科学学报》
CAS
北大核心
2014年第2期218-222,共5页
Journal of Natural Science of Heilongjiang University
基金
国家自然科学基金资助项目(21201060)
黑龙江省博士后资助经费项目(LBH-Z11037)
