A Novel Method to Improve the Electrochemical Performance of LiMn2O4 Cathode Active Material by CaCO3 Surface Coating

Abstract

Abstract: Spinel LiMn₂O₄ was synthesized by glycine-nitrate method and coated with CaCO₃ in order to enhance the electrochemical performance at room temperature (25°C) and 55°C. The uncoated and CaCO₃-coated LiMn₂O₄ 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 LiMn₂O₄ without causing any structural change. The charge-discharge tests showed that the specific discharge capacity fade of pristine electrode at 25 and 55°C 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.

Key words: LiMn₂O₄, CaCO₃ surface coating, Cathode material, Capacity fade, Cycleability, Lithium ion battery

Halil Sahan, Huseyin Goktepe and Saban Patat. A Novel Method to Improve the Electrochemical Performance of LiMn₂O₄ Cathode Active Material by CaCO₃ Surface Coating[J]. J Mater Sci Technol, 2011, 27(5): 415-420.

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A Novel Method to Improve the Electrochemical Performance of LiMn₂O₄ Cathode Active Material by CaCO₃ Surface Coating

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