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<p>Due to environmental friendliness, low manufacturing cost, and high theoretical capacity, the spinel MgMn<sub>2</sub>O<sub>4</sub> have been a potentially promising cathode material for aqueous magnesium-ion batteries (AMIBs). However, the low electrical conductivity, poor ion diffusion kinetics, and terrible structural stability of MgMn<sub>2</sub>O<sub>4</sub> are the three major obstacles, which prevent their further application. In this work, MgMn<sub>1.5</sub>Ni<sub>0.5</sub>O<sub>4</sub> is coated by PPy film via electrochemical deposition of cyclic voltammetry. The thickness of PPy coating were affected by the cycle number. P-4 (4 cycles) displayed good rate capability with a high discharge-specific capacity of 273.3 mAh g<sup>−1</sup> at 50&#xa0;mA&#xa0;g<sup>−1</sup> and long cyclic life of 2000 laps with a capacity retention of 90.8% at 1000 mA&#xa0;g<sup>−1</sup>. Appropriate electrochemical deposition of PPy coating inhibits Mn-ion dissolution and improves the electrical conductivity, which enhances the ion diffusion and structure stability during the discharge/charge processes. Moreover, the mechanism of strong interactions between conducting PPy film and metal oxides revealed in this work will provide reasonable strategies to further extend the cycle lifespan of AMIBs.</p>

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Long-life MgMn1.5Ni0.5O4 cathode for aqueous magnesium-ion battery enabled by polypyrrole coating

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • Daile Zhang,
  • Jianghua Zhang,
  • Jingyi Kang

摘要

Due to environmental friendliness, low manufacturing cost, and high theoretical capacity, the spinel MgMn2O4 have been a potentially promising cathode material for aqueous magnesium-ion batteries (AMIBs). However, the low electrical conductivity, poor ion diffusion kinetics, and terrible structural stability of MgMn2O4 are the three major obstacles, which prevent their further application. In this work, MgMn1.5Ni0.5O4 is coated by PPy film via electrochemical deposition of cyclic voltammetry. The thickness of PPy coating were affected by the cycle number. P-4 (4 cycles) displayed good rate capability with a high discharge-specific capacity of 273.3 mAh g−1 at 50 mA g−1 and long cyclic life of 2000 laps with a capacity retention of 90.8% at 1000 mA g−1. Appropriate electrochemical deposition of PPy coating inhibits Mn-ion dissolution and improves the electrical conductivity, which enhances the ion diffusion and structure stability during the discharge/charge processes. Moreover, the mechanism of strong interactions between conducting PPy film and metal oxides revealed in this work will provide reasonable strategies to further extend the cycle lifespan of AMIBs.