A new approach to improve the electrochemical performance of Li-rich cathode material by precursor pretreatment
作者： Meng Wang , Min Luo , Yunbo Chen , Lin Chen , Shuo Yan
DOI: 10.1016/J.JALLCOM.2016.12.054
关键词: Faraday efficiency 、 Diffusion 、 Electrochemistry 、 Dielectric spectroscopy 、 Magazine 、 Materials science 、 Chemical engineering 、 Nanotechnology 、 Field emission microscopy 、 Mother liquor 、 Lithium-ion battery
摘要: Abstract The layered Li-rich 0.5Li2MnO3·0.5LiNi1/3Mn1/3Co1/3O2 cathode material was synthesized via a co-precipitation method. carbonate precursor pretreated in the mother liquor for various time and effects on electrochemical performance were studied. Field emission scanning electron microscope (FESEM) X-ray diffraction (XRD) used to characterize micromorphology structure of material. Meanwhile, charge-discharge test impedance spectroscopy (EIS) employed study its performance. It found that an extended pretreatment can result relatively excellent hexagonal ordering low degree cation mixing. by aged liquid 12 h possessed initial discharge capacity 262.7 mAh g−1 with coulombic efficiency 82.1% at 0.1 C. And retention after 50 cycles 1.0 C 76.9%. EIS showed had lowest charge transfer resistance (32.02 Ω) highest diffusion coefficients D L i + (3.45 × 10−14 cm2 s−1).
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