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<p>A solvent-free strategy combining dry ball milling and calcination is developed to fabricate an Al-Y co-doped ZrO<sub>2</sub> (Al-YSZ) coating on LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> (NCM811) cathodes. Structural characterizations confirm Al-YSZ induces NCM811 lattice expansion (unit cell volume + 0.00026 nm<sup>3</sup>) and reduces cation mixing (<i>I</i><sub>(003)</sub>/<i>I</i><sub>(104)</sub> = 1.621). TEM shows a ~ 50&#xa0;nm coating with intimate matrix contact. Electrochemically, it delivers 218.9 mAh/g at 0.1 C (21.7% higher than pristine), retains 161.5 mAh/g after 200 cycles at 1 C, and exhibits superior stability under 4.5&#xa0;V (137.3 mAh/g after 200 cycles), 45&#xa0;℃ (64.5% retention), and 5 C (86.0% retention). Mechanisms involve enhanced interfacial stability, optimized Li<sup>+</sup> kinetics (diffusion coefficient 2.21 × 10<sup>−12</sup> cm<sup>2</sup>/s after cycling), and mitigated structural degradation. This scalable green strategy advances high-nickel cathode optimization.</p>

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Performance optimization of Al–Y co-doped ZrO2-coated LiNi0.8Co0.1Mn0.1O2 cathode material for lithium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Xiaoru Zhang,
  • Laima Luo,
  • Jing Song,
  • Mingming Han,
  • Hongqian Sun,
  • Lei Cao,
  • Yucheng Wu

摘要

A solvent-free strategy combining dry ball milling and calcination is developed to fabricate an Al-Y co-doped ZrO2 (Al-YSZ) coating on LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes. Structural characterizations confirm Al-YSZ induces NCM811 lattice expansion (unit cell volume + 0.00026 nm3) and reduces cation mixing (I(003)/I(104) = 1.621). TEM shows a ~ 50 nm coating with intimate matrix contact. Electrochemically, it delivers 218.9 mAh/g at 0.1 C (21.7% higher than pristine), retains 161.5 mAh/g after 200 cycles at 1 C, and exhibits superior stability under 4.5 V (137.3 mAh/g after 200 cycles), 45 ℃ (64.5% retention), and 5 C (86.0% retention). Mechanisms involve enhanced interfacial stability, optimized Li+ kinetics (diffusion coefficient 2.21 × 10−12 cm2/s after cycling), and mitigated structural degradation. This scalable green strategy advances high-nickel cathode optimization.