• Effects of sonication power on electrochemical performance of ZrO$_2$-decorated LiMn$_2$O$_4$ cathode material for LIBs

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      https://www.ias.ac.in/article/fulltext/boms/044/0109

    • Keywords

       

      LiMn2O4 cathode; lithium-ion battery; ultrasonic sonication; sol–gel; surface decoration.

    • Abstract

       

      The LiMn$_2$O$_4$ (LMO) powder is decorated with ZrO$_2$ (denoted as Zr@LMO) particles by using sonicationassisted sol–gel method. Different sonication powers (10, 30 and 50%) are used to disperse ZrO$_2$ and the effects of ZrO$_2$ distribution at LiMn$_2$O$_4$'s electrochemical performance are analysed. Scanning electron microscopy and energy dispersive spectroscopy analyses have been made on laminated samples. For the structural analyses of particles, X-ray diffractometer is used. Electrochemical performances of electrodes are tested with galvanostatic measurements, cyclic voltammograms and electrochemical impedance spectroscopy. The ZrO$_2$ distribution ratio on the particle surfaces is improved by 10% with the increase of sonication power from 10 to 50%. Therefore, at 50% sonication power, lower charge transfer resistance and side reactions (Mn dissolution) are accomplished, which leads to 41 and 9% specific capacity increase compared to pure and the lowest sonication power, respectively. After 100 cycles at 0.1C, 93.2 mAh g$^{–1}$ specific discharge capacity and 73.4% capacity retention are attained for ZrO$_2$-decorated LMO at 50% sonication power. Furthermore, at 2C rate, the specific discharge capacity of the decorated sample at 50% sonication power is 59% higher than the pure LMO.

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    • Author Affiliations

       

      MEHMET EMRE CETINTASOGLU1 OZGUL KELES2

      1. Department of Chemical Oceanography, Institute of Marine Sciences and Management, Istanbul University, Istanbul 34134, Turkey
      2. Department of Metallurgical and Materials Engineering, Istanbul Technical University, Istanbul 34469, Turkey
    • Dates

       
  • Bulletin of Materials Science | News

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