文献类型：期刊文献

英文题名：Hierarchical LiFe0.98MII0.02PO4/C (MII = Ni, Mn, Mg) composites via co-doping for lithium ion batteries

作者：Zhang, Xiaohong[1]; Xu, Xing[1]; Dong, Hui[1]; Xu, Yunlong[1]; Zhao, Chongjun[1]; Liu, Dong[2]; Zhang, Yang[3]; Chen, Jufeng[1]; Xie, Miao[1]

机构：[1] School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Department of Material Science and Engineering, University of Texas at Arlington, Arlington, TX, 76019, United States; [3] Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China

年份：2018

卷号：189

期号：3

外文期刊名：IOP Conference Series: Earth and Environmental Science

收录：EI(收录号：20184706120780)

语种：英文

外文关键词：Iron compounds - Phosphorus compounds - Spray pyrolysis - Crystal structure - Doping (additives) - Cyclic voltammetry - Electric discharges - Electrochemical impedance spectroscopy - Lithium-ion batteries - Scanning electron microscopy - Carbothermal reduction

摘要：Hierarchical LiFe0.98MII0.02PO4/C (MII = Ni, Mn, Mg) composites via co-doping with a variety of cations synthesized through carbothermal reduction assisted with spray pyrolysis are first studied. The physicochemical properties are characterized by X-ray diffraction (XRD), Elemental analyzer, Raman spectroscopy measurements, Field-emission scanning electron microscope (FE-SEM) and High-resolution transmission electron microscope (HR-TEM). The electrochemical performance is characterized via galvanostatic charge/discharge tests, Cyclic voltammetry (CV) test and Electrochemical impedance spectroscopy (EIS) measurement. The results show that successful co-doping with different substitution portfolios can stabilize the crystal structure. What's more, trace ions incorporated into LiFePO4 can also serve as catalyst for graphitization and crystal growth. Especially, among all the co-doped LiFe0.98MII0.02PO4/C (MII = Ni, Mn, Mg) composites, LiFe0.98Ni0.01Mn0.01PO4/C exhibits the most outstanding electrochemical activities. The LiFe0.98Ni0.01Mn0.01PO4/C composite displays a high discharge capacity of ～135 mAh/g at 1 C with the capacity retention close to 95% after 100 cycles. The much more excellent ratability and superior cyclability of LiFe0.98Ni0.01Mn0.01PO4/C might be ascribed to the synergistic effect of vicariant lithium phosphates, that is, LiFePO4, LiNiPO4 and LiMnPO4. ? Published under licence by IOP Publishing Ltd.