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<p>The utilization of Li-rich layered oxides (LLOs) as cathodes in high-energy Li-ion batteries is significantly hindered by serious voltage decay and capacity fading due to irreversible oxygen release and transition metal (TM) migration triggered by the lattice strain. Herein, B ions are effectively incorporated into the tetrahedral vacancies situated between TM slab and Li layer of LLOs. The robust B-O bond, along with the low Bader charge of oxygen within BO<sub>4</sub> tetrahedra, alleviates excessive oxidation of O anions while substantially reinforcing the oxygen framework. Consequently, the B-doped LLO sample exhibits only slight variation in lattice parameters, especially the <i>c</i>-axis, which can be characterized as exhibiting “zero-strain” as supported by in situ XRD data. As a result, the discharge capacity of the B-LLO sample maintains 210.66&#xa0;mAh·g<sup>−1</sup> after 300 cycles, with a retention ratio of 90.7%.</p> Graphical Abstract <p></p>

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Inhibiting lattice strain for highly stable and long-life Li-rich Mn-based layered cathodes

  • 期刊论文

  • 发表日期：

    2025年1月23日

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  • Wen-Zhao Huang,
  • Wei Wang,
  • Xiao-La Li,
  • Zi-Yang Liang,
  • Bo-Yang Zhang,
  • Chen-Yu Liu,
  • Qi Liu,
  • Zhan Lin,
  • Dong Luo

摘要

The utilization of Li-rich layered oxides (LLOs) as cathodes in high-energy Li-ion batteries is significantly hindered by serious voltage decay and capacity fading due to irreversible oxygen release and transition metal (TM) migration triggered by the lattice strain. Herein, B ions are effectively incorporated into the tetrahedral vacancies situated between TM slab and Li layer of LLOs. The robust B-O bond, along with the low Bader charge of oxygen within BO4 tetrahedra, alleviates excessive oxidation of O anions while substantially reinforcing the oxygen framework. Consequently, the B-doped LLO sample exhibits only slight variation in lattice parameters, especially the c-axis, which can be characterized as exhibiting “zero-strain” as supported by in situ XRD data. As a result, the discharge capacity of the B-LLO sample maintains 210.66 mAh·g−1 after 300 cycles, with a retention ratio of 90.7%.

Graphical Abstract