硝尿配合法合成掺杂尖晶石LiNi0.06Cr0.1Mn1.84O4及电化学性能研究  

Synthesis and characterization of LiNi0.06Cr0.1Mn1.84O4 powders prepared by metal-urea nitrate complexes precursors

作　　者：高媛[1] 赖琼钰[2] 胡向贵[2] 

机构地区：[1]重庆工商大学环境与生物工程学院,重庆400064 [2]四川大学化学学院,四川成都610064

出　　处：《功能材料》2007年第A04期1411-1414,共4页Journal of Functional Materials

摘　　要：以硝尿配合物为前驱物，合成协同掺杂尖晶石LiNi0.06Cr0.1Mn1.84O4正极材料，用XRD，SEM表征其结构与性能。结果表明，当煅烧温度为800℃烧结时间为7h时，所得产物粒度均匀，分布窄，平均粒度为60nm，呈球形颗粒。该材料具有良好的电化学性能，在4V附近首次充放电比容量为121mAh／g，循环15次之后达到最大放电比容量128mAh／g，循环50次后放电比容量仍能保持111mAh／g，容量损失率为7．5％。循环伏安曲线显示，材料具有良好的电化学可逆性与循环稳定性。LiNi0.06Cr0.1Mn1.84O4 powders were prepared by heating metal-urea nitrate complexes precursors. The influence of synthesis conditions on the structural and electrochemical properties of LiNi0.06Cr0.1Mn1.84O4 was investigated by X-ray diffraction, scanning electron microscopy and charge-discharge experiments. The powders were well crystallized. The powders were a narrow particle size distribution and regular morphology about 60 nm. Electrochemical performances indicated that LiNi0.06Cr0.1Mn1.84O4 delivered a high capacity of 121mAh/g at first, 111 mAh/g at 50^st cycle. The results show, there are two pairs of voltammetric wave （centered at 4V）, indicating materials an excellent reversibility.

关 键 词：锂离子电池 硝尿配合物 LiNi0.06Cr0.1Mn1.84O4 协同掺杂 

分 类 号：O614.111[理学—无机化学] O614.711[理学—化学]