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首页> 外文期刊>Advanced energy materials >Modifying Li@Mn_6 Superstructure Units by Al Substitution to Enhance the Long-Cycle Performance of Co-Free Li-Rich Cathode
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Modifying Li@Mn_6 Superstructure Units by Al Substitution to Enhance the Long-Cycle Performance of Co-Free Li-Rich Cathode

机译：通过Al替代改变Li @ Mn_6上层结构单元，提高无共同的锂富芯阴极的长循环性能

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摘要

As one of the most promising cathodes for Li-ion batteries, Li-rich layered oxides suffer from low Coulombic efficiency, severe capacity fading, and voltage decay, which are related to the aggregated Li@Mn-6 superstructure units. Herein, a Co-free Li-rich oxide Li[Li1/4Mn1/2Ni1/6Al1/12]O-2 through Al substitution of Co in Li[Li1/4Mn1/2Ni1/6Co1/12]O-2, is designed. Combining the average structural refinement with the detailed local structural/chemical analysis, it is found that the introduced Al ions occupy the Mn sites in Li@Mn-6 superstructure units, which further induces the partial replacement of the central Li ions in Li@Mn-6 units by Ni2+. The modified superstructure units stabilize the anionic framework and suppress structural degradation during long-term cycling. A superior cyclability (a capacity retention of 91.4% after 500 cycles at 1 C) is achieved. This work not only deepens the understanding into the mechanism of Al substitution, but also provides a novel route to design high-performance Li-rich cathodes by modifying the local functional units.
机译：作为锂离子电池最有前途的阴极之一，富富氧化物含有低库仑效率，严重的容量衰落和电压衰减，与聚集的LI @ MN-6上部结构单元有关。在本文中，设计了一种通过Al In Li [Li1 / 4Mn1 / 2Ni1 / 6Co1 / 12] O-2的Al取代的无共吸的富含富氧化物Li [Li1 / 4Mn1 / 2Ni1 / 6Al1 / 12] O-2。将平均结构细化与详细的局部结构/化学分析相结合，发现介绍的AL离子占据LI @ MN-6上层建筑单元的MN位点，这进一步诱导了LI @ MN中的中央锂离子的部分替代-6单位通过Ni2 +。改性的上部结构单元稳定阴离子框架并在长期循环期间抑制结构降解。实现了优异的可循环性（在1℃下500次循环后91.4％的容量保持91.4％）。这项工作不仅深化了铝业替代机制的理解，还通过修改局部功能单元来提供一种新的设计高性能锂阴极的路线。

著录项

  • 来源
    《Advanced energy materials》 |2021年第37期|2101962.1-2101962.10|共10页
  • 作者

    Li Zhibo; Li Yiwei; Zhang Mingjian; Yin Zu-Wei; Yin Liang; Xu Shenyang; Zuo Changjian; Qi Rui; Xue Haoyu; Hu Jiangtao; Cao Bo; Chu Mihai; Zhao Wenguang; Ren Yang; Xie Lin; Ren Guoxi; Pan Feng;

  • 作者单位

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Argonne Natl Lab Adv Photon Source Xray Sci Div Lemont IL 60439 USA;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

    Argonne Natl Lab Adv Photon Source Xray Sci Div Lemont IL 60439 USA;

    Southern Univ Sci & Technol Dept Phys Shenzhen 518055 Peoples R China;

    Chinese Acad Sci Shanghai Inst Microsystem & Informat Technol State Key Lab Funct Mat Informat Shanghai 200050 Peoples R China;

    Peking Univ Shenzhen Grad Sch Sch Adv Mat Shenzhen 518055 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Al substitution; Co-free Li-rich cathodes; Li@Mn; (6) superstructure units; Li-ion batteries; local structural modification;

    机译：Al替换;无共同的锂阴极;李@ Mn;（6）上部结构单位;锂离子电池;局部结构修改;

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