摘要
采用共沉淀法合成富锂锰基正极材料Li1.2Mn0.54Ni0.13Co0.13O2,以Al2O3对材料进行表面包覆改性。经X射线衍射(XRD)、扫描电子显微镜(SEM)和傅里叶变换红外光谱(FTIR)对所合成材料的结构和形貌进行表征,通过恒流充放电测试和交流阻抗测试研究材料的电化学性能。结果表明:表面包覆改性前后的材料均为α-NaFeO2层状构型;经过25次循环后,包覆Al2O3材料的放电比容量为240 mAh·g-1,容量保持率达95.1%;电荷迁移电阻减小150Ω,呈现更优的电化学性能。
Abstract： Lithium-rich manganese-based cathode material Li1.2Mn0.54Ni0.13Co0.13O2 was prepared by co-precipitation method and further coated with Al2O3. The structure and morphology of the prepared materials were characterized by X-ray diffraction （XRD） , scanning electron microscopy （SEM） and Fourier transform infrared spectroscopy （FTIR）. Galvanostatical charge-discharge tests and electrochemical impedance spectroscopy were employed to investigate the electrochemical properties of the prepared materials. XRD patterns indicate that both the pristine Lit. 2 Mn0.54 Ni0.13 Coo. 13 02 and the coated material take on layered structure of α-NaFeO2. After 25 cycles, the discharge specific capacity of the coated material was 240 mAh· g-1 ,the capacity retention was 95.1% ,and the charge transfer resistance reduced by 150Ω,leading to better electrochemical performance.
出处
《济南大学学报（自然科学版）》
CAS
北大核心
2014年第5期347-350,共4页
Journal of University of Jinan(Science and Technology)
基金
国家自然科学基金(51102114)
