摘要
采用溶胶凝胶法合成锂离子电池正极材料LiMn2O4、LiNi0.01Co0.01Mn1.98O4和LiNi0.01Co0.01Mn1.98O3.95F0.05。使用X射线衍射、扫描电子显微镜对合成材料的结构及物理性能进行了表征。将合成材料作为锂离子电池正极活性材料,用循环伏安、交流阻抗及充放电测试的电化学测试方法对材料进行了电化学的研究。结果表明,合成的LiNi0.01Co0.01Mn1.98O3.95F0.05材料的初始容量高于LiNi0.01Co0.01Mn1.98O4,而循环性能优于LiNi0.01Co0.01Mn1.98O4和LiMn2O4,显示了阴阳离子复合掺杂对于阳离子单一掺杂的优势。
The cathode materials, LiMn2O4, LiNi0.01Co0.01Mn1.98O4 and LiNi0.01Co0.01Mn1.98O3.95F0.05 for lithium ion batteries were synthesized by the sol-gel method. The synthesized materials were characterized with X-ray diffraction （XRD） and analytical scanning electron microscope （SEM）. The as-prepared powders were used as cathode materials for lithium-ion battery, whose discharge capacity and cycle voltammogram properties were examined. The results showed that LiNi0.01CO0.01Mn1.98O3.95F0.05 synthesized by the sol-gel method had higher initial capacity than LiNi0.01Co0.01Mn1.98O4 and better cyclic performance than that of LiNi0.01Co0.01Mn1.9804 and LiMn2O4, which revealed that cation and anion dual-doped LiMn2O4 could gain better electrochemical properties of LiMn2O4 than only the cation-doped LiMn2O4.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2007年第3期396-399,404,共5页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(No.20273047)
教育部博士点基金(No.20020056045)资助项目
