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<p>Developing battery materials with high specific energy and long cycle life is a crucial core technology that needs to be broken. High-nickel and high-voltage are the development trends of cathode materials, but the structural instability seriously deteriorate electrochemical performance. Herein, to solve the above problem and obtain structurally stable high-voltage nickel-rich cathode materials, a novel high-voltage spinel-structured cladding layer was designed by wet chemistry and coated on the surface of LiNi<sub>0.83</sub>Co<sub>0.11</sub>Mn<sub>0.06</sub>O<sub>2</sub> material. LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> with spinel structure possesses good structural compatibility with layered cathode materials and has efficient three-dimensional Li-ion diffusion paths, which can meet the needs of Li-ion diffusion kinetics. Meanwhile, LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> has a high operating voltage and a very stable thermodynamic structure in the charging state which can inhibit the corrosion and interfacial side reactions of the cathode material, thus stabilizing the crystal structure. The results show that 1 wt% LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub>-coated sample displayed the best electrochemical performance, with a discharge capacity of 203.7 mAh g<sup>−1</sup> at 1 C, the capacity retention of 77.71% after 200 cycles, and even after 300 cycles, the capacity retention still reached 64.36%.</p>

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Spinel-structured lithium nickel manganese oxide decorated LiNi0.83Co0.11Mn0.06O2 cathode material with stable structure and excellent performance for Li-ion batteries

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Xueyi Guo,
  • Haiyan Cai,
  • Gaoqiang Mao,
  • Wen Jiao,
  • Wanjing Yu,
  • Kui Meng,
  • Hui Tong,
  • Kaihua Xu,
  • Kun Zhang,
  • Yuping Zhang

摘要

Developing battery materials with high specific energy and long cycle life is a crucial core technology that needs to be broken. High-nickel and high-voltage are the development trends of cathode materials, but the structural instability seriously deteriorate electrochemical performance. Herein, to solve the above problem and obtain structurally stable high-voltage nickel-rich cathode materials, a novel high-voltage spinel-structured cladding layer was designed by wet chemistry and coated on the surface of LiNi0.83Co0.11Mn0.06O2 material. LiNi0.5Mn1.5O4 with spinel structure possesses good structural compatibility with layered cathode materials and has efficient three-dimensional Li-ion diffusion paths, which can meet the needs of Li-ion diffusion kinetics. Meanwhile, LiNi0.5Mn1.5O4 has a high operating voltage and a very stable thermodynamic structure in the charging state which can inhibit the corrosion and interfacial side reactions of the cathode material, thus stabilizing the crystal structure. The results show that 1 wt% LiNi0.5Mn1.5O4-coated sample displayed the best electrochemical performance, with a discharge capacity of 203.7 mAh g−1 at 1 C, the capacity retention of 77.71% after 200 cycles, and even after 300 cycles, the capacity retention still reached 64.36%.