尖晶石
电化学
锂(药物)
阴极
材料科学
离子
无机化学
化学
冶金
电极
有机化学
医学
内分泌学
物理化学
作者
Yucheng Sun,Zhaoxiang Wang,Xuejie Huang,Liquan Chen
标识
DOI:10.1016/j.jpowsour.2004.01.020
摘要
A series of spinel-structured LiMn2−x−yNixCryO4 have been prepared and their electrochemical performances as 5-V cathode materials for lithium ion batteries are evaluated. The synthesis reactions for these materials are characterized by TG/DSC, XRD and SEM. TG/DSC measurements show that the chemical reactions for the final product are completed below 400 °C. XRD analysis indicates that spinel structure is formed at around 650 °C. However, SEM images show well-defined polyhedron crystalline particles do not appear until 800 °C. Electrochemical evaluation shows that LiMn1.4Ni0.4Cr0.2O4 prepared at 850 °C boasts the best electrochemical performance with an initial discharge capacity of 128 mA h/g and a capacity retention of more than 90% after 230 cycles between 3.5 and 4.98 V.
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