采用溶胶-凝胶法制备低钴三元正极材料Li NiXCoYMn1-X-YO2(X=0.2,0.3,0.4,0.5,0.6;Y=0.1,0.2),通过X射线衍射(XRD)、扫描电镜(SEM)和电化学性能测试对样品的结构和性能进行了表征。结果表明,Li Ni0.4Co0.2Mn0.4O2层状结构良好,颗粒粒径...采用溶胶-凝胶法制备低钴三元正极材料Li NiXCoYMn1-X-YO2(X=0.2,0.3,0.4,0.5,0.6;Y=0.1,0.2),通过X射线衍射(XRD)、扫描电镜(SEM)和电化学性能测试对样品的结构和性能进行了表征。结果表明,Li Ni0.4Co0.2Mn0.4O2层状结构良好,颗粒粒径较小且分布均匀,该样品具有最好的电化学性能,首次放电比容量可达146.2 m Ah/g,循环20次后放电比容量可达111.7 m Ah/g。展开更多
Cathode materials Li[CoxNiyMn1-x-y]O2 for lithium secondary batteries have been prepared by a new route using layered double hydroxides （LDHs） as a precursor. The resulting layered phase with the α- NaFe02 structur...Cathode materials Li[CoxNiyMn1-x-y]O2 for lithium secondary batteries have been prepared by a new route using layered double hydroxides （LDHs） as a precursor. The resulting layered phase with the α- NaFe02 structure crystallizes in the rhombohedral system, with space group R-3m having an interlayer spacing close to 0.47 nm. X-ray photoelectron spectroscopy （XPS） was used to measure the oxidation states of Co, Ni and Mn. The effects of varying the Co[Ni[Mn ratio on both the structure and electrochemical properties of Li[CoxNiyMn1-x-y]O2 have been investigated by X-ray diffraction and electrochemical tests. The products demonstrated a rather stable cycling behavior, with a reversible capacity of 118 mAh/g for the layered material with Co/Ni/Mn = 1/1/1.展开更多
文摘采用溶胶-凝胶法制备低钴三元正极材料Li NiXCoYMn1-X-YO2(X=0.2,0.3,0.4,0.5,0.6;Y=0.1,0.2),通过X射线衍射(XRD)、扫描电镜(SEM)和电化学性能测试对样品的结构和性能进行了表征。结果表明,Li Ni0.4Co0.2Mn0.4O2层状结构良好,颗粒粒径较小且分布均匀,该样品具有最好的电化学性能,首次放电比容量可达146.2 m Ah/g,循环20次后放电比容量可达111.7 m Ah/g。
基金supported by the National Natural Science Foun-dation of China, the 111 Project (grant no.: B07004) the Natural Science Foundation for Young Teachers of Beijing University of Chemical Technology (grant no.: QN0723)
文摘Cathode materials Li[CoxNiyMn1-x-y]O2 for lithium secondary batteries have been prepared by a new route using layered double hydroxides （LDHs） as a precursor. The resulting layered phase with the α- NaFe02 structure crystallizes in the rhombohedral system, with space group R-3m having an interlayer spacing close to 0.47 nm. X-ray photoelectron spectroscopy （XPS） was used to measure the oxidation states of Co, Ni and Mn. The effects of varying the Co[Ni[Mn ratio on both the structure and electrochemical properties of Li[CoxNiyMn1-x-y]O2 have been investigated by X-ray diffraction and electrochemical tests. The products demonstrated a rather stable cycling behavior, with a reversible capacity of 118 mAh/g for the layered material with Co/Ni/Mn = 1/1/1.
