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A Novel Method to Improve the Electrochemical Performance of LiMn_2O_4 Cathode Active Material by CaCO_3 Surface Coating

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Journal of Materials Science & Technology 2011年第5期27卷 415-420页

作者： halil sahan Hüseyin Gktepe Saban Patat Deparment of Chemistry Science of FacultyUniversity of Erciyes

Spinel LiMn204 was synthesized by glycine-nitrate method and coated with CaCO3 in order to enhance the electrochemical performance at room temperature （25℃） and 55℃. The uncoated and CaCO3-coated LiMn204 materials were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and electrochemical tests. XRD and SEM results indicated that CaCO3 particles encapsulated the surface of the LiMn204 without causing any structural change. The charge-discharge tests showed that the specific discharge capacity fade of pristine electrode at 25 and 55℃ were 25.5% and 52%, respectively. However, surface modified cathode shows 7.4% and 29.5% loss compared to initial specific discharge capacity at 70th cycle for 25 and 55~C, respectively. The improvement of electrochemical performance is attributed to suppression of Mn2＋ dissolution into electrolyte via CaCO3 layer.

关键词： LiMn204 CaC03 surface coating Cathode material Capacity fade Cycleability Lithium ion battery

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Synthesis and Electrochemical Properties of Carbon-Mixed LiEr_(0.02)Fe_(0.98)PO_4 Cathode Material for Lithium-ion Batteries

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Journal of Materials Science & Technology 2011年第9期27卷 861-864页

作者： Hüseyin Gktepe halil sahan Ahmet lgen Saban Patat Department of Chemistry M krkǒglu Vocational High School University of Erciyes Department of Chemistry Science of Faculty University of Erciyes

LiEr0.02Fe0.98PO4/C composite cathode was synthesized by a simple solution method with polyethylene glycol （PEG） as the reductive agent and carbon source. The effect of erbium doping on the electrochemical behavior of LiFePO4 was studied in this paper. The samples were characterized by X-ray powder diffraction and scanning electron microscopy and the electrochemical properties were investigated by the charge-discharge test. An initial discharge capacity of 149 mAh.g-1 was achieved for the LiEr0.02Fe0.98PO4/C composite cathode with a rate of 0.1 C. The electronic conductivity of Er doped LiFePO4/C was measured as 10-2 ***-1. The results indicated that erbium doping did not destroy the lattice structure of LiFePO4 and enlarge the lattice volume. These changes are beneficial to the improvement of the electrochemical performance of the LiFePO4 cathode.

关键词： LiFePO4 Cathode Erbium doping Lithium batteries

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