【作者】 蒋燕萍； 谢键； 余红明； 邬春阳； 曹高劭； 赵新兵；

【Author】 JIANG Yan-ping,XIE Jian,YU Hong-ming,WU Chun-ming, CAO Gao-shao,ZHAO Xin-bing (Department of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China )

【机构】 浙江大学材料科学与工程系；

【摘要】 采用喷雾干燥结合后续热处理法获得3V电极材料Li₄Mn₅O₁₂。X射线衍射（XRD）显示产物为结晶良好的立方尖晶石相,扫描电镜（SEM）、透射电镜（TEM）显示所得材料为纳米颗粒,且具有立方体状规则形貌。通过激光粒度分布测试表明该方法制得的晶粒尺寸分布均匀,平均尺寸为27.3nm。电化学测试发现0.5C首次放电容量为158.7mAhg^-1（为理论容量的97.4%）,100个循环之后降为117.9mAhg^-1,通过电化学测试我们认为材料中存在少量的Mn²⁺是导致材料性能下降的主要原因。更多还原

【Abstract】 3V spinel Li₄Mn₅O₁₂ was prepared by spray drying combined with high-temperature heat treatment. X-ray diffraction（XRD） shows that the product is a well-crystallized single-phase spinel Li₄Mn₅O₁₂.Scanning electron microscope（SEM） and transmission electron microscope（TEM） show that the material is in nanoscale with a cube-shaped morphology.Laser particle size distribution test shows that the obtained material has an average size of 27.3nm with a narrow size distribution of 20-50 nm.Electrochemical tests show that the material delivers a first discharge capacity of 158.7mAh g^-1 at 0.5C,97.4%of its theoretical capacity.After cycled 100 times,the capacity is reduced to 117.9mAh g^-1.It is believed that a small amount of Mn³⁺ is responsible for the degradation of the material during cycling.更多还原