Synthesis of Nanostructured LiNi_(1/3)Co_(1/3)Mn-(1/3)O-2 by AmmoniaEvaporation-Induced Synthesis and Its Electrochemical Properties as a Cathode Material for a High-Power Li-Ion Battery

采用氨蒸发诱导法成功制备出纳米结构lInI1/3CO1/3Mn1/3O2正极材料,借助X射线衍射(Xrd)分析、扫描电镜(SEM)、透射电镜(TEM)、高分辨率透射电镜(HrTEM)、能量分散谱(EdS)和比表面测试等表征手段及恒电流充放电测试研究了其晶体结构、微观形貌和电化学性能.研究表明该方法制备出的材料具有良好的α-nAfEO2层状结构,阳离子混排程度低.纳米片交错堆积而成核桃仁状形貌,片与片之间形成许多纳米孔,而且纳米片的侧面属于{010}活性面,能够提供较多的锂离子的脱嵌通道.在室温下及3.0-4.6 V充放电范围内,该材料在电流密度为0.5C、1C、3C、5C和10C时放电比容量分别为172.90、153.95、147.09、142.16和131.23MAH？g-1.说明其具有优异的电化学性能,非常有潜力用于动力汽车等高功率密度锂离子电池中.We report on an ammonia-evaporation-induced synthetic method for nanostructured LiNi1/3Co1/3Mn1/3O2 cathode material.Powder X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), high- resolution transmission electron microscopy(HRTEM), energy- dispersive X- ray spectroscopy(EDS), Brunauer-Emmett-Teller nitrogen sorption, and galvanostatic charge-discharge tests were applied to analyze the crystal structure, micromorphology, and electrochemical properties of nanostructured LiNi1/3Co1/3Mn1/3O2.The results show that it has a well-ordered layered α-NaFeO2 with little cation mixing.A walnutkernel- like morphology is formed by nanosheets, leading to a nanoporous material.The lateral plane of nanosheets are {010}-faceted, which could provide multiple channels for Li+-ion migration.The electrochemical properties of the lithium cells used this material as cathode are excellent: the specific discharge capacity at 0.5C,1C, 3C, 5C and 10 C is, respectively, up to 172.90, 153.95, 147.09, 142.16, and 131.23 mAh?g-1between 3.0and 4.6 V at room temperature.These excellent features will make the nanostructured LiNi1/3Co1/3Mn1/3O2 become a positive electrode material of potential interest for useful applications, such as in electric vehicles and hybrid electric vehicles.四川大学青年基金(2011SCU11081); 教育部高校博士学科点科研基金(20120181120103)资助项目~