电化学
阴极
材料科学
纳米-
溶胶凝胶
化学工程
纳米技术
复合材料
化学
电极
物理化学
工程类
作者
Liying Liu,Guiyuan Chen,Bingtian Du,Yanyan Cui,Xi Ke,Jun Li,Zaiping Guo,Zhicong Shi,Haiyan Zhang,Shulei Chou
标识
DOI:10.1016/j.electacta.2017.09.165
摘要
Abstract Cathode materials LiMn 0.5 Fe 0.5 PO 4 /C and LiMnPO 4 /C were synthesized by a high-energy ball-milling assisted sol-gel method. The LiMn 0.5 Fe 0.5 PO 4 consists of nanorods and nanoparticles homogeneously wrapped with highly ordering carbon. The increased Neel-temperature and decreased effective magnetic moment of LiMn 0.5 Fe 0.5 PO 4 /C revealed the microstructure differences from LiMnPO 4 /C. Meanwhile, tiny amount of ferromagnetic impurities is detected in LiMn 0.5 Fe 0.5 PO 4 /C by magnetic tests. The synergetic effects of Fe substitution and carbon coating remarkably improve rate capacity and cyclic stability of LiMn 0.5 Fe 0.5 PO 4 /C. This solid solution delivers initial discharge capacities of 128.6 mAh g −1 and 116.3 mAh g −1 and capacity retentions of 93.5% and 90.3% after 100 cycles at 1C and 2C respectively, significantly better than LiMnPO 4 /C.
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