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<p>Cation-disordered rocksalt (DRX) cathodes have emerged as promising candidates for next-generation energy storage due to their high theoretical capacity and reliance on earth-abundant elements. However, their practical implementation is severely limited by inherently sluggish electrical conductivity and restricted Li<sup>+</sup> diffusion. In this study, we propose a facile structural engineering strategy by incorporating few-layer Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene, prepared via ball-milling, as a multifunctional conductive additive for Li<sub>1.2</sub>Mn<sub>0.4</sub>Ti<sub>0.4</sub>O<sub>2</sub> DRX cathodes. By synergistically coupling 2D MXene nanosheets with conventional 0D carbon black, a robust hierarchical “point-to-surface” conductive network is successfully constructed. Systematic electrochemical characterizations reveal that optimal MXene integration not only serves as a physical protective barrier but also provides accessible sites for transient lithium-ion storage, thereby collectively accelerating Li<sup>+</sup>/electron transport and mitigating interfacial polarization. Consequently, the optimized composite electrode with 20% MXene additive delivers a remarkably high initial discharge capacity of 203.7 mAh g<sup>− 1</sup> at 0.1&#xa0;C, substantially outperforming the pristine electrode (165.2 mAh g<sup>− 1</sup>), alongside markedly superior rate capability and structural reversibility. This work provides critical mechanistic insights into MXene-mediated modifications and offers a sustainable pathway for the design of high-performance Mn-based DRX cathodes.</p>

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Ball-milled few-layer Ti3C2Tx MXene as a multifunctional additive for constructing robust conductive networks in Li1.2Mn0.4Ti0.4O2 rock-salt cathodes

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Yu Yan,
  • Xiaofei Sun,
  • Shiyu Yin,
  • Qing Chang,
  • Jie Huang,
  • Bei Wang,
  • Qinyuan Le,
  • Guodong Jiang

摘要

Cation-disordered rocksalt (DRX) cathodes have emerged as promising candidates for next-generation energy storage due to their high theoretical capacity and reliance on earth-abundant elements. However, their practical implementation is severely limited by inherently sluggish electrical conductivity and restricted Li+ diffusion. In this study, we propose a facile structural engineering strategy by incorporating few-layer Ti3C2Tx MXene, prepared via ball-milling, as a multifunctional conductive additive for Li1.2Mn0.4Ti0.4O2 DRX cathodes. By synergistically coupling 2D MXene nanosheets with conventional 0D carbon black, a robust hierarchical “point-to-surface” conductive network is successfully constructed. Systematic electrochemical characterizations reveal that optimal MXene integration not only serves as a physical protective barrier but also provides accessible sites for transient lithium-ion storage, thereby collectively accelerating Li+/electron transport and mitigating interfacial polarization. Consequently, the optimized composite electrode with 20% MXene additive delivers a remarkably high initial discharge capacity of 203.7 mAh g− 1 at 0.1 C, substantially outperforming the pristine electrode (165.2 mAh g− 1), alongside markedly superior rate capability and structural reversibility. This work provides critical mechanistic insights into MXene-mediated modifications and offers a sustainable pathway for the design of high-performance Mn-based DRX cathodes.