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Partic. vol. 30 pp. 144-150 (February 2017) doi: 10.1016/j.partic.2016.05.008
Preparation and electrochemical performance of carbon-coated LiFePO4/LiMnPO4-positive material for a Li-ion battery
Qiangqiang Tana, Bo Yana, b, Yuxing Xua, Yunfa Chena, Jun Yanga, *
Highlights
Abstract
Lithium iron phosphate (LiFePO4)/lithium manganese phosphate (LiMnPO4)-positive material was successfully prepared through ball milling and high-temperature sintering using manganese acetate, lithium hydroxide, ammonium dihydrogen phosphate, and ferrous oxalate as raw materials. The as-prepared samples were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, a constant current charge–discharge test, cyclic voltammetry, and electrochemical impedance spectroscopy. The effects of lithium iron phosphate coating were also discussed. Because of its special core–shell structure, the as-prepared LiMn0.7Fe0.3PO4–LiFePO4–C exhibits excellent electrochemical performance. The discharge capacity reached 136.6 mAh/g and the specific discharge energy reached 506.9 Wh/kg at a rate of 0.1 C.
Graphical abstract
Keywords
LiMn1−xFexPO4; Composite; Core–shell structure; Positive material; Li-ion battery