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3D hierarchical rose-like Ni2P@rGO assembled from interconnected nanoflakes as anode for lithium ion batteries

机译：3D rgo rgo从互连的纳米薄片组装为锂离子电池的阳极

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摘要

In recent years, anode materials of transition metal phosphates (TMPs) for lithium ion batteries (LIBs) have drawn a vast amount of attention from researchers, due to their high theoretical capacity and comparatively low intercalation potentials vs. Li/Li+. However, in practice, their application remains constrained by poor electrical conductivity, and dramatic volume expansion and severe agglomeration during the lithium process, which leads to questionable kinetic issues and a prompt decline in capacity during cycling. Herein, through an elaborate design, we developed a novel three-dimensional (3D) hierarchical rose-like architecture self-assembled from two-dimensional (2D) Ni2P nanoflakes immobilized on reduced graphene oxide (rGO) via a combination of a hydrothermal process and phosphating treatment. Such a design provides unique superiority for Ni2P-based anode materials for LIBs. Paraphrasing, the 3D hierarchical structure of Ni2P distributes the stress on the anode material while cycling and provides more lithium storage space. The rGO not only enhances the conductivity of materials, but also serves as a flexible framework which immobilizes Ni2P so that it prevents it from pulverization. Therefore, the synergistic effect between them guarantees the integrity of the material structure after a long-term cycling Li+ intercalation and deintercalation process. When it acted as anode material for LIBs, the as-obtained 3D rose-like Ni2P@rGO electrode exhibited a noticeable electrochemical performance, which delivers a discharge capacity of 330.5 mA h g(-1) at a current density of 100 mA g(-1) after 100 cycles and retains 200.5 mA h g(-1) at 1000 mA g(-1).
机译：近年来，由于其高理论能力和相对低的插入电位与Li / Li +，锂离子电池（LIBS）的过渡金属磷酸盐（LIBPS）的阳极材料（Libs）绘制了大量的重视。然而，在实践中，它们的申请仍然受到耐锂导电性差的差，并且在锂方法期间的剧烈体积膨胀和严重的聚集，这导致循环期间能量的动力问题和迅速下降。在此，通过精心设计，我们开发了一种从二维（2D）Ni2P纳米薄片上自组装的新型三维（3D）等级玫瑰架构，其通过水热过程的组合在还原的氧化石氧化物（RGO）上固定在还原的氧化物（RGO）上。磷化处理。这种设计为LIBS提供了基于NI2P的阳极材料的独特优势。改写该了Ni2P的三维分层结构分布上，同时循环所述阳极材料中的应力，并提供更多的锂存储空间。 RGO不仅提高了材料的电导率，还用作柔性框架，其固定Ni2P，使其防止其粉碎。因此，它们之间的协同效应可确保在长期循环Li +嵌入和蜕膜过程之后的材料结构的完整性。当它作为LIBS的阳极材料时，所获得的3D升升Ni2P @ Rgo电极表现出明显的电化学性能，其在电流密度为100 mA G（ - ）的排出容量为330.5 mA Hg（-1）（ - 1）100次循环后，在1000mA g（-1）时保留200.5 mA Hg（-1）。

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  • 来源
    《RSC Advances》 |2020年第7期|共10页
  • 作者

    Cai Gan; Wu Zhenguo; Luo Tao; Zhong Yanjun; Guo Xiaodong; Zhang Zhiye; Wang Xinlong; Zhong Benhe;

  • 作者单位

    Sichuan Univ Sch Chem Engn Engn Res Ctr Comprehens Utilizat &

    Clean Proc Pho Minist Educ Chengdu 610065 Peoples R China;

    Sichuan Univ Sch Chem Engn Engn Res Ctr Comprehens Utilizat &

    Clean Proc Pho Minist Educ Chengdu 610065 Peoples R China;

    Sichuan Univ Sch Chem Engn Engn Res Ctr Comprehens Utilizat &

    Clean Proc Pho Minist Educ Chengdu 610065 Peoples R China;

    Sichuan Univ Sch Chem Engn Engn Res Ctr Comprehens Utilizat &

    Clean Proc Pho Minist Educ Chengdu 610065 Peoples R China;

    Sichuan Univ Sch Chem Engn Engn Res Ctr Comprehens Utilizat &

    Clean Proc Pho Minist Educ Chengdu 610065 Peoples R China;

    Sichuan Univ Sch Chem Engn Engn Res Ctr Comprehens Utilizat &

    Clean Proc Pho Minist Educ Chengdu 610065 Peoples R China;

    Sichuan Univ Sch Chem Engn Engn Res Ctr Comprehens Utilizat &

    Clean Proc Pho Minist Educ Chengdu 610065 Peoples R China;

    Sichuan Univ Sch Chem Engn Engn Res Ctr Comprehens Utilizat &

    Clean Proc Pho Minist Educ Chengdu 610065 Peoples R China;

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