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Abstract <p>LiMn<sub>2</sub>O<sub>4</sub> precursors were prepared by chemical precipitation and the precursors were coated to prepare LiMn<sub>2</sub>O<sub>4</sub> composites. X-ray diffraction and scanning electron microscopy showed that LiMn<sub>2</sub>O<sub>4</sub> had been successfully combined with Al<sub>2</sub>O<sub>3</sub>. Electrode charge-discharge and electrochemical impedance tests showed that the cycle performance of LiMn<sub>2</sub>O<sub>4</sub>/Al<sub>2</sub>O<sub>3</sub> at high rate is the best. The initial discharge capacity of LiMn<sub>2</sub>O<sub>4</sub>/Al<sub>2</sub>O<sub>3</sub> reached 104.4 mA h g<sup>–1</sup>. After 100 cycles, the capacity retention rates of 1, 2, and 5 C were 78.9, 75.1, and 69.7%, respectively, compared with only 70.8, 62.6, and 52.8% for pristine LiMn<sub>2</sub>O<sub>4</sub>. The improved electrochemical performance was attributed to the nanoscale oxides hindering the reaction between the electrolyte and the electrode, which effectively improved the stability of the material during high current charging and discharging.</p>

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To Study the Effect of Al2O3 Nano-powder Coating As an Electrode Material in Lithium Batteries

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Shihang Dai,
  • Yao Liu,
  • Qinan Chen,
  • Lijing Dai

摘要

Abstract

LiMn2O4 precursors were prepared by chemical precipitation and the precursors were coated to prepare LiMn2O4 composites. X-ray diffraction and scanning electron microscopy showed that LiMn2O4 had been successfully combined with Al2O3. Electrode charge-discharge and electrochemical impedance tests showed that the cycle performance of LiMn2O4/Al2O3 at high rate is the best. The initial discharge capacity of LiMn2O4/Al2O3 reached 104.4 mA h g–1. After 100 cycles, the capacity retention rates of 1, 2, and 5 C were 78.9, 75.1, and 69.7%, respectively, compared with only 70.8, 62.6, and 52.8% for pristine LiMn2O4. The improved electrochemical performance was attributed to the nanoscale oxides hindering the reaction between the electrolyte and the electrode, which effectively improved the stability of the material during high current charging and discharging.