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首页> 外文期刊>Advanced Functional Materials >High-Capacity and Stable Sodium-Sulfur Battery Enabled by Confined Electrocatalytic Polysulfides Full Conversion
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High-Capacity and Stable Sodium-Sulfur Battery Enabled by Confined Electrocatalytic Polysulfides Full Conversion

机译：由狭窄的电催化多硫化物全转化为实现的高容量和稳定硫磺电池

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摘要

The efficient polysulfide capture and reversible sulfur recovery during reverse charging process are critical to exploiting the full potential of room temperature Na-S batteries. Here, based on a core-shell design strategy, the structural and chemical synergistic manipulation of sodium polysulfides quasi-solid-state reversible conversion is proposed. The sulfur is encapsulated in the multi-pores of 3D interconnected carbon fiber as the core structure. The Fe(CN)(6)(4-)-doped polypyrrole film serves as a redox-active polar shell to lock up polysulfides and promote complete polysulfide conversion. Importantly, the short-chain Na2S4 polysulfides are reduced to Na2S directly leaving with a small fraction of soluble intermediates as the cation-transfer medium at the core/shell interface, and freeing up formation of solid Na2S2 incomplete product. Further, the redox mediator with open Fe species electrocatalytically lowers the Na2S oxidation energy barrier and renders the high reversibility of electrodeposited Na2S. The tunable quasi-solid-state reversible sulfur conversion under versatile polymer sheath greatly enhances sulfur utilization, affording a remarkable capacity of 1071 mAh g(-1) and a stable high capacity of 700 mAh g(-1) at 200 mA g(-1) after 200 cycles. The confined electrocatalytic effect provides a strategy for tuning electrochemical pathway of sulfur species and guarantees high-efficiency sulfur electrochemistry.
机译：在反向充电过程中有效的多硫化物捕获和可逆硫恢复对于利用室温Na-S电池的全部潜力至关重要。这里，基于核心壳设计策略，提出了多硫化钠的结构和化学协同操作准固态可逆转化率。将硫封装在3D互连碳纤维的多孔中作为芯结构。 Fe（CN）（6）（4 - ）掺杂的聚吡咯膜用作氧化还原活性的极性壳，以锁定多硫化物并促进完全的多硫化物转化。重要的是，短链Na2S4多硫化物直接将含有芯/壳界面的阳离子转移介质的溶解中间体的小部分直接留下，并释放固体Na 2 S 2不完全产品的溶解介质。此外，氧化还原介体具有开放的Fe物种电催化降低Na2S氧化能阻挡，并使电沉积Na 2的高可逆性。可调节的准固态可逆硫转化率在通用聚合物护套下大大提高了硫利用率，这是2000mA G（ - ）在200mA g（ - - 3）稳定的1071mAhg（-1）的容量，稳定的高容量（-1）（ - ） 1）200次循环后。狭窄的电催化作用提供了一种调整硫类电化学途径的策略，并保证高效硫电化学。

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  • 来源
    《Advanced Functional Materials》 |2021年第17期|2100666.1-2100666.8|共8页
  • 作者

    Huang Zhanpeng; Song Bin; Zhang Hong; Feng Fan; Zhang Wenli; Lu Ke; Chen Qianwang;

  • 作者单位

    Anhui Univ Inst Phys Sci & Informat Technol Key Lab Struct & Funct Regulat Hybrid Mat Minist Educ Hefei 230601 Peoples R China;

    Soochow Univ Collaborat Innovat Ctr Suzhou Nano Sci & Technol Inst Funct Nano & Soft Mat FUNSOM Lab Nanoscale Biochem Anal Suzhou 215123 Peoples R China;

    Shanghai Jiao Tong Univ Sch Chem & Chem Engn Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Sch Chem & Chem Engn Shanghai 200240 Peoples R China;

    Guangdong Univ Technol Sch Chem Engn & Light Ind Guangzhou Key Lab Clean Transportat Energy Chem Guangzhou 510006 Peoples R China;

    Anhui Univ Inst Phys Sci & Informat Technol Key Lab Struct & Funct Regulat Hybrid Mat Minist Educ Hefei 230601 Peoples R China;

    Anhui Univ Inst Phys Sci & Informat Technol Key Lab Struct & Funct Regulat Hybrid Mat Minist Educ Hefei 230601 Peoples R China|Univ Sci & Technol China Hefei Natl Lab Phys Sci Microscale Hefei 230026 Peoples R China|Univ Sci & Technol China Dept Mat Sci & Engn Hefei 230026 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    confined electrocatalysis; core#8208; shell structures; Na; #63743; S batteries; polysulfide manipulation; reaction kinetics;

    机译：狭窄的电催化;核心＆＃8208;壳体结构;＆＃63743的电池;多硫化物操作;反应动力学;

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