Preparation and electrochemical performance of Li₂Mn_0.5Fe_0.5SiO₄ cathode material with sol-gel method for lithium ion batteries

Abstract

Li₂Fe_0.5Mn_0.5SiO₄ material was synthesized by a citric acid-assisted sol-gel method. The influence of the stoichiometric ratio value of n(citric acid) to n(Fe²⁺-Mn²⁺) on the electrochemical properties of Li₂Fe_0.5Mn_0.5SiO₄ was studied. The final sample was identified as Li₂Fe_0.5Mn_0.5SiO₄ with a Pmn2₁ monoclinic structure by X-ray diffraction analysis. The crystal phases components and crystal phase structure of the Li₂Fe_0.5Mn_0.4SiO₄ material were improved as the increase of the stoichiometric ratio value of n(citric acid) to n(Fe²⁺-Mn²⁺). Field-emission scanning electron microscopy verified that the Li₂Fe_0.5Mn_0.5SiO₄ particles are agglomerates of Li₂Fe_0.5Mn_0.5SiO₄ primary particles with a geometric mean diameter of 220 nm. The Li₂Fe_0.5Mn_0.5SiO₄ sample was used as an electrode material for rechargeable lithium ion batteries, and the electrochemical measurements were carried out at room temperature. The Li₂Fe_0.5Mn_0.5SiO₄ electrode delivered a first discharge capacity of 230.1 mAh/g at the current density of 10 mA/g in first cycle and about 162 mAh/g after 20 cycles at the current density of 20 mA/g.

Keywords

lithium ion battery / Li₂Fe_0.5Mn_0.5SiO₄ / citric acid assisted sol-gel method / cathode

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