摘要
采用溶胶-凝胶法合成制备了分子式为Li1.05Co0.05VxMn1.95-xO4(x=0.02、0.05、0.08)的固溶体样品。利用XRD、SEM对材料进行结构形态表征,并以合成的材料为正极材料进行循环伏安(CV)和恒电流充放电测试,结果显示:固溶体Li1.05Co0.05VxMn1.95-xO4具有较好的尖晶石结构,且颗粒分布均匀,晶面光滑。电化学测试结果显示:其具有较好的充放电性能和良好的循环性能,在室温0.5 C充放电倍率下,Li1.05Co0.05V0.05Mn1.9O4材料的初始放电比容量为110.7 mAh/g,且50次循环后,容量保持率为94.6%。
The solid solution Li1.05Co0.05VxMn1.95-xO4（x=0.02,0.05,0.08） were synthesized by sol-gel method.The chemical characterization of the materials was examined by X-ray diffraction and scanning electron microscopy（SEM）.Their electrochemical properties were investigated by cyclic voltammetry（CV） and galvanostatic charge-discharge tests.Results indicated that the materials as the same with LiMn2O4 exhibited a cubic spinel structure narrower particle distribution and smooth surface morphology.Electrochemical testing results showed that the materials possessed good charge and discharge property and excellent cycle performance.The initial discharge capacity of Li1.05Co0.05V0.05Mn1.9O4 reached 110.7 mAh/g and its discharge capacity remained 94.6% after running for 50 cycles at room temperature.
出处
《广州化工》
CAS
2012年第6期71-72,76,共3页
GuangZhou Chemical Industry
