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<p>The research on Li–CO<sub>2</sub> batteries with substantial energy density is notable for its potential contribution to the carbon neutrality. A pivotal aspect of the study is the advancement of cost-effective and efficient cathode catalysts to improve Li–CO<sub>2</sub> battery performance. Herein, a unique hierarchical medium-entropy nitride (CoNiMnN@C) composite is prepared through the utilization of mixed metal solution construction of metal organic frameworks, aiming at developing cathode catalysts with superior dispersion ability of lithium carbonate and conductivity. As a result, the CoNiMnN@C based Li–CO<sub>2</sub> battery presents an exceptional discharge capacity of 23555&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup> due to the distinctive medium-entropy effect of CoNiMnN and the hierarchical structure that exposes numerous catalytic active sites. The battery also exhibits impressive durability across multiple cycles lasts 500&#xa0;h and maintains a low overpotential of 1.48&#xa0;V at a discharge/charge rate of 100&#xa0;mA&#xa0;g<sup>−1</sup>. This work extends the application of medium-entropy materials in Li–CO<sub>2</sub> batteries and provides unique ways to its design.</p>

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Unique hierarchically structured medium-entropy nitride for rechargeable Li–CO2 batteries with high capacity

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Hui Cheng,
  • Diyi Wang,
  • Zhoujie Mao,
  • Jiacheng Yi,
  • Yong Yang

摘要

The research on Li–CO2 batteries with substantial energy density is notable for its potential contribution to the carbon neutrality. A pivotal aspect of the study is the advancement of cost-effective and efficient cathode catalysts to improve Li–CO2 battery performance. Herein, a unique hierarchical medium-entropy nitride (CoNiMnN@C) composite is prepared through the utilization of mixed metal solution construction of metal organic frameworks, aiming at developing cathode catalysts with superior dispersion ability of lithium carbonate and conductivity. As a result, the CoNiMnN@C based Li–CO2 battery presents an exceptional discharge capacity of 23555 mA h g−1 due to the distinctive medium-entropy effect of CoNiMnN and the hierarchical structure that exposes numerous catalytic active sites. The battery also exhibits impressive durability across multiple cycles lasts 500 h and maintains a low overpotential of 1.48 V at a discharge/charge rate of 100 mA g−1. This work extends the application of medium-entropy materials in Li–CO2 batteries and provides unique ways to its design.