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Dual-Function Electrolyte Additive for Highly Reversible Zn Anode

机译：用于高度可逆Zn阳极的双功能电解质添加剂

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摘要

Practical application of aqueous Zn-ion batteries (AZIBs) is significantly limited by poor reversibility of the Zn anode. This is because of 1) dendrite growth, and 2) water-induced parasitic reactions including hydrogen evolution, during cycling. Here for the first time an elegantly simple method is reported that introduces ethylene diamine tetraacetic acid tetrasodium salt (Na(4)EDTA) to a ZnSO4 electrolyte. This is shown to concomitantly suppress dendritic Zn deposition and H-2 evolution. Findings confirm that EDTA anions are adsorbed on the Zn surface and dominate active sites for H-2 generation and inhibit water electrolysis. Additionally, adsorbed EDTA promotes desolvation of Zn(H2O)(6)(2+) by removing H2O molecules from the solvation sheath of Zn2+. Side reactions and dendrite growth are therefore suppressed by using the additive. A high Zn reversibility with Coulombic efficiency (CE) of 99.5% and long lifespan of 2500 cycles at 5 mAh cm(-2), 2 mAh cm(-2) is demonstrated. Additionally, the highly reversible Zn electrode significantly boosts overall performance of VO2//Zn full-cells. These findings are expected to be of immediate benefit to a range of researchers in using dual-function additives to suppress Zn dendrite and parasitic reactions for electrochemistry and energy storage applications.
机译：水性Zn离子电池（AZIB）的实际应用受Zn阳极可逆性差的显着限制。这是因为1）枝晶生长，2）在循环期间，水诱导的寄生反应，包括氢气进化。这里首次报道了优雅简单的方法，以乙二胺四乙酸四胞盐（Na（4）EDTA）引入ZnSO 4电解质。这被证明伴随着树突Zn沉积和H-2进化。调查结果证实EDTA阴离子被吸附在Zn表面上，并使H-2产生的活性位点固定并抑制水电解。另外，吸附的EDTA通过从Zn2 +的溶剂鞘中除去H 2 O分子来促进Zn（H 2 O）（6）（6）（2+）的去溶剂。因此，通过使用添加剂抑制了副反应和树突生长。对59.5％的Coulombic效率（Ce）具有99.5％的高Zn可逆性，在5mAhcm（-2），2mAhcm（-2）下为2500次循环。另外，高度可逆的Zn电极显着提高了VO2 // Zn全细胞的整体性能。这些发现预计将在使用双功能添加剂抑制Zn Dendrite和寄生反应的一系列研究人员的立即效益，用于电化学和储能应用。

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  • 来源
    《Advanced energy materials》 |2021年第37期|2102010.1-2102010.9|共9页
  • 作者

    Zhang Shao-Jian; Hao Junnan; Luo Dan; Zhang Peng-Fang; Zhang Bingkai; Davey Kenneth; Lin Zhan; Qiao Shi-Zhang;

  • 作者单位

    Univ Adelaide Sch Chem Engn & Adv Mat Adelaide SA 5005 Australia;

    Univ Adelaide Sch Chem Engn & Adv Mat Adelaide SA 5005 Australia;

    South China Normal Univ Sch Informat & Optoelect Sci & Engn Guangzhou 510006 Guangdong Peoples R China;

    Liaocheng Univ Shandong Prov Key Lab Collaborat Innovat Ctr Chem Energy Storage & Nove Liaocheng 252000 Shandong Peoples R China|Liaocheng Univ Sch Chem & Chem Engn Liaocheng 252000 Shandong Peoples R China;

    Guangdong Univ Technol Sch Chem Engn & Light Ind Guangzhou 510006 Peoples R China;

    Univ Adelaide Sch Chem Engn & Adv Mat Adelaide SA 5005 Australia;

    Guangdong Univ Technol Sch Chem Engn & Light Ind Guangzhou 510006 Peoples R China;

    Univ Adelaide Sch Chem Engn & Adv Mat Adelaide SA 5005 Australia;

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  • 正文语种 eng
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  • 关键词

    desolvation promotors; electrolysis inhibitors; EDTA; hydrogen evolution; Zn dendrites;

    机译：脱溶解者推广器;电解抑制剂;EDTA;氢气进化;Zn Dendrites;

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