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<p>LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> (LNMO) spinel stands as a promising candidate for next-generation cathode materials in lithium-ion batteries (LIBs), due to its high operating voltage and cobalt-free composition. However, its practical implementation is hindered by inherent structural instabilities, including manganese dissolution and surface side reactions triggered by electrolyte decomposition at high voltages. To overcome these limitations, we design a synergistic regulation strategy involving co-doping with high-valency molybdenum and tungsten. The incorporation of Mo<sup>6+</sup> and W<sup>6+</sup> facilitates the formation of a Li<sub>2</sub>WO<sub>4</sub> coating on the LNMO surface, effectively suppressing manganese dissolution and interfacial side reactions. This modification not only enhances the structural stability but also expands the lattice spacing, thereby facilitating efficient Li<sup>+</sup> storage and transport. As a result, the modified cathode delivers an initial discharge capacity of 122.3 mAh g<sup>–1</sup> at 1&#xa0;C and maintains a capacity retention of 95.1% after 200 cycles. This promising solution offers practical application prospects for LNMO cathode materials.</p>

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Synergistic Mo-W Co-doping for enhanced electrochemical performance of LiNi0.5Mn1.5O4 spinel cathodes

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Xuefeng Zhang,
  • Chuang Wang,
  • Zhuang Wu,
  • Fan Cheng,
  • Xuecong Wang,
  • Jialiang An,
  • Zhao Fang

摘要

LiNi0.5Mn1.5O4 (LNMO) spinel stands as a promising candidate for next-generation cathode materials in lithium-ion batteries (LIBs), due to its high operating voltage and cobalt-free composition. However, its practical implementation is hindered by inherent structural instabilities, including manganese dissolution and surface side reactions triggered by electrolyte decomposition at high voltages. To overcome these limitations, we design a synergistic regulation strategy involving co-doping with high-valency molybdenum and tungsten. The incorporation of Mo6+ and W6+ facilitates the formation of a Li2WO4 coating on the LNMO surface, effectively suppressing manganese dissolution and interfacial side reactions. This modification not only enhances the structural stability but also expands the lattice spacing, thereby facilitating efficient Li+ storage and transport. As a result, the modified cathode delivers an initial discharge capacity of 122.3 mAh g–1 at 1 C and maintains a capacity retention of 95.1% after 200 cycles. This promising solution offers practical application prospects for LNMO cathode materials.