中南大学学报（自然科学版）2016，Vol.47Issue(12)：4000-4007,8.DOI:10.11817/j.issn.1672-7207.2016.12.006
LiAlO2包覆Li1.5Ni0.25Mn0.75O2.5正极材料及其电化学性能
Synthesis and property of LiAlO2 modified Li1.5Ni0.25Mn0.75O2.5 as cathode materials for Li-ion battery
摘要
Abstract
Li1.5Ni0.25Mn0.75O2.5 was synthesized by co-precipitation and high temperature solid state reaction, and the LiAlO2-coated Li1.5Ni0.25Mn0.75O2.5 was synthesized by solid-solution. The structure, surface morphology and electrochemical performance of the samples were characterized by X-ray diffraction (XRD), scanning electron microscope(SEM), transmission electron microscope(TEM), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge testing. The results show that the samples deliver theα-NaFeO2 layered structure. After coating with LiAlO2, the cyclic stability and rate capability of Li1.5Ni0.25Mn0.75O2.5 are improved effectively. The sample coated with 5%(mass fraction) LiAlO2 exhibits excellent properties. First discharge specific capacity is 254.64 mA∙h/g. The capacity retaining ratio is increased from 84.5%to 98.9%after 50 cycles. The discharge capacity of LiAlO2-coated Li1.5Ni0.25Mn0.75O2.5 is 58.29 mA∙h/g at 10C, while that of pristine is only about 15.27 mA∙h/g. The sample coated with 5%(mass fraction) LiAlO2 has the lowest charge transfer impedance.关键词
锂离子电池/正极材料/Li1.5Ni0.25Mn0.75O2.5/LiAlO2/表面包覆Key words
lithium-ion battery/cathode material/Li1.5Ni0.25Mn0.75O2.5/LiAlO2/surface coating分类
信息技术与安全科学引用本文复制引用
王起亮,王星奇,王天成,刘云建,苏明如,窦爱春,高彥涌,张志强..LiAlO2包覆Li1.5Ni0.25Mn0.75O2.5正极材料及其电化学性能[J].中南大学学报（自然科学版）,2016,47(12):4000-4007,8.基金项目
国家自然科学基金资助项目(51304081)；江苏省自然科学基金资助项目(BK20140581)；江苏省高等学校大学生实践创新训练计划项目(201410299010Z)(Project(51304081) supported by the National Natural Science Foundation of China （51304081）
Project(BK20140581) supported by the Natural Science Foundation of Jiangsu Province （BK20140581）
Project(201410299010Z) supported by the Practice Innovation Training Program for the Jiangsu College Students) （201410299010Z）
