摘要
采用高温固相浸渍法合成了多元复合掺杂的尖晶石锰酸锂正极材料LiCo_(0.02)La_(0.01)Mn_(1.97)O_(3.98)Cl_(0.02)。采用X衍射分析仪、扫描电镜、马尔文激光粒径分析仪、电化学工作站以及充放电分析仪等设备表征了材料的电化学性能与特性。XRD表明所合成的材料具有良好的尖晶石型结构特征,所掺杂是元素Co,La分别占据了元素Mn的位置,元素Cl占据了元素O的位置。合成材料LiCo_(0.02)La_(0.01)Mn_(1.97)O_(3.98)Cl_(0.02)比材料LiMn_2O_4有更好的电化学特性,150次循环后的比容量保持率在91.7%.
The cathode material LiCo_(0.02)La_(0.01) Mn_(1.97) O_(3.98) Cl_(0.02) multidoped spinel has been synthesized by solid-state method.The structure and electrochemical performance are characterized by XRD,SEM,particle size distribution analysis,cycling charge-discharge and electrochemical impedance spectroscopy.XRD patterns show that sample exhibits pure spinel phase.The substitution of Co,La for Mn and Cl for O in the LiMn_2O_4 stabilizes the structural integrity of the spinel host.The results of the charge-discharge curves showed that LiCo_(0.02)La_(0.01) Mn_(1.97)O_(3.98)Cl_(0.02) has better electrochemical performance than that un-doped material LiMn_2O_4.The cycle performance has been improved that the capacity of the electrode maintains 91.7%of the initial capacity at 150th cycle.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第S2期73-75,共3页
Acta Scientiarum Naturalium Universitatis Sunyatseni
关键词
锂离子电池
尖晶石锰酸锂
多元掺杂
电化学性能
Lithium-ion cells
lithium manganese oxide spinel
multidoped
electrochemical properties
