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首页> 外文期刊>Advanced Functional Materials >Understanding the Critical Role of Binders in Phosphorus/ Carbon Anode for Sodium-Ion Batteries through Unexpected Mechanism
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Understanding the Critical Role of Binders in Phosphorus/ Carbon Anode for Sodium-Ion Batteries through Unexpected Mechanism

机译：通过意外机制理解粘合剂在磷/碳阳极中粘合剂的关键作用

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摘要

Polymer binders that combine active materials with conductive agents have played a critical role in maintaining the structural integrity of phosphorus anodes with a huge volume change upon sodiation/desodiation. Herein, the role of binders on the structural/chemical stability of phosphorus/carbon anode is spectroscopically uncovered through unexpected mechanism. Surprisingly, the selection of different binders is found to determine the oxidation degree of active phosphorus in various electrodes, which correlate well with their electrochemical properties. At a high oxidation degree, the electrode applying a conventional poly(vinylidene difluoride) binder displays the worst electrochemical properties, while the electrode using a sodium alginate binder delivers the best electrochemical performance (a highly reversible capacity of 1064 mAh g(-1)with a 90.1% capacity retention at 800 mA g(-1)after 200 cycles and an outstanding rate capability of 401 mAh g(-1)at 8000 mA g(-1)) for its negligible oxidation. Additionally, the emergence/decomposition of surface intermediates, including (PO2)(3-)and (PO4)(3-)species, are observed in the discharging/charging processes via the ex situ P K-edge X-ray absorption spectroscopies. This novel discovery of the unique role of binders in phosphorus anodes, not only provides an opportunity to ameliorate their electrochemical properties, but also enables their practical applications in high-energy sodium-ion batteries.
机译：将活性材料与导电剂结合的聚合物粘合剂在维持磷阳极的结构完整性时在加固/退出时具有巨大体积变化的结构完整性起到了关键作用。在此，粘合剂对磷/碳阳极结构/化学稳定性的作用通过意外的机制光谱揭示。令人惊讶的是，发现不同粘合剂的选择来确定各种电极中活性磷的氧化程度，其与它们的电化学性能很好。在高氧化度下，施加常规聚（偏二氟化乙烯基）粘合剂的电极显示最差的电化学性质，而使用藻酸钠粘合剂的电极提供最佳的电化学性能（高度可逆的容量为1064mAhg（-1）在800 mA g（-1）下的90.1％容量保持在200次循环和8000mAg（-1）的优异速率能力，氧化可忽略不计。另外，在放电/充电过程中通过Ex原位P k边射线吸收光谱观察到表面中间体的出苗/分解，包括（PO2）和（3-）（3-）物种。这种新颖的发现粘合剂在磷阳极中的独特作用，不仅提供了改善其电化学性能的机会，而且还可以使其在高能量钠离子电池中的实际应用。

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  • 来源
    《Advanced Functional Materials》 |2020年第32期|2000060.1-2000060.15|共15页
  • 作者

    Xiao Wei; Sun Qian; Banis Mohammad Norouzi; Wang Biqiong; Li Weihan; Li Minsi; Lushington Andrew; Li Ruying; Li Xifei; Sham Tsun-Kong; Sun Xueliang;

  • 作者单位

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada|Univ Western Ontario Dept Chem London ON N6A 5B7 Canada|Xian Univ Technol Sch Mat Sci & Engn Inst Adv Electrochem Energy Xian 710048 Shaanxi Peoples R China;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

    Xian Univ Technol Sch Mat Sci & Engn Inst Adv Electrochem Energy Xian 710048 Shaanxi Peoples R China;

    Univ Western Ontario Dept Chem London ON N6A 5B7 Canada;

    Univ Western Ontario Dept Mech & Mat Engn London ON N6A 5B9 Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    binder; phosphorus; carbon anode; sodium alginate; sodium-ion batteries; surface oxidation;

    机译：粘合剂;磷;碳阳极;藻酸钠;钠离子电池;表面氧化;

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