Electrochemical Properties of Spherical, Porous LiMn<sub>2−</sub><i><sub>x</sub></i>Mg<i><sub>x</sub></i>O<sub>4</sub> Powders Prepared by Ultrasonic Spray Pyrolysis

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  • Electrochemical Properties of Spherical,Porous LiMn2-xMgxO4 Powders Prepared by Ultrasonic Spray Pyrolysis

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Abstract

<p>Spherical LiMn2−xMgxO4 powders were prepared by the ultrasonic spray pyrolysis. As-prepared particles had a porous microstructure and were nonagglomerated, which had an average diameter of about 1 µm with narrow size distribution. XRD showed that as-prepared powders were well crystallized to spinel structure with Fd3m space group. ICP analysis revealed that Mg ions were homogeneously doped to LiMn2O4. As-prepared powders were used as cathode active material for lithium secondary battery and its electrochemical properties were investigated between 3.5 and 4.3 V. The first charge/discharge capacity of LiMn2O4 was 145 and 141 mAh g−1 at 0.1 mA cm−2, respectively. The discharge capacity of LiMn2O4 decreased with increasing cycle number. The first charge/discharge capacity of LiMn2−xMgxO4 was less than that of LiMn2O4. However, the cycle performance of LiMn2−xMgxO4 was superior to that of LiMn2O4.</p>

Journal

  • Electrochemistry

    Electrochemistry 68 (3), 162-166, 2000-03-05

    The Electrochemical Society of Japan

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