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首页> 外文期刊>Advanced energy materials >Toward a Reversible Mn~(4+)/Mn~(2+) Redox Reaction and Dendrite-Free Zn Anode in Near-Neutral Aqueous Zn/MnO_2 Batteries via Salt Anion Chemistry
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Toward a Reversible Mn~(4+)/Mn~(2+) Redox Reaction and Dendrite-Free Zn Anode in Near-Neutral Aqueous Zn/MnO_2 Batteries via Salt Anion Chemistry

机译：通过盐阴离子化学致近中立Zn / MnO_2电池中的可逆Mn〜（4 +）/ Mn〜（2+）氧化还原反应和树突式无Zn阳极

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摘要

Rechargeable aqueous Zn/MnO(2)batteries are very attractive large-scale energy storage technologies, but still suffer from limited cycle life and low capacity. Here the novel adoption of a near-neutral acetate-based electrolyte (pH approximate to 6) is presented to promote the two-electron Mn4+/Mn(2+)redox reaction and simultaneously enable a stable Zn anode. The acetate anion triggers a highly reversible MnO2/Mn(2+)reaction, which ensures high capacity and avoids the issue of structural collapse of MnO2. Meanwhile, the anode-friendly electrolyte enables a dendrite-free Zn anode with outstanding stability and high plating/stripping Coulombic efficiency (99.8%). Hence, a high capacity of 556 mA h g(-1), a lifetime of 4000 cycles without decay, and excellent rate capability up to 70 mA cm(-2)are demonstated in this new near-neutral aqueous Zn/MnO(2)battery by simply manipulating the salt anion in the electrolyte. The acetate anion not only modifies the surface properties of MnO(2)cathode but also creates a highly compatible environment for the Zn anode. This work provides a new opportunity for developing high-performance Zn/MnO(2)and other aqueous batteries based on the salt anion chemistry.
机译：可充电的Zn / MNO（2）电池是非常有吸引力的大型能量存储技术，但仍然遭受有限的循环寿命和低容量。这里提出了近中性乙酸基于乙酸基基电解质（pH大致为6）的新颖采用，以促进双电子MN4 + / Mn（2+）氧化还原反应，并同时使稳定的Zn阳极能够。乙酸盐阴离子触发高度可逆的MNO2 / Mn（2+）反应，可确保高容量，避免MnO2的结构塌陷问题。同时，阳极友好的电解质使无稳定性和高电镀/汽提库效率（99.8％）的树突式无Zn阳极。因此，在这种新的近中立的Zn / mnO（2）中，在没有衰减的情况下，高容量为556mA Hg（-1），寿命为4000次循环，并且高达70 mA cm（-2）的优异速率能力通过简单地操纵电解质中的盐阴离子。醋酸乙酸阴离子不仅改变MnO（2）阴极的表面性质，而且还为Zn阳极产生高度相容的环境。这项工作为开发高性能Zn / MnO（2）和基于盐阴离子化学的其他含水电池提供了新的机会。

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  • 来源
    《Advanced energy materials》 |2020年第32期|1904163.1-1904163.9|共9页
  • 作者

    Zeng Xiaohui; Liu Jiatu; Mao Jianfeng; Hao Junnan; Wang Zhijie; Zhou Si; Ling Chris D.; Guo Zaiping;

  • 作者单位

    Univ Wollongong Inst Superconducting & Elect Mat ISEM Australian Inst Innovat Mat AIIM Sch Mech Mat Mechatron & Biomed Engn Wollongong NSW 2522 Australia;

    Univ Sydney Sch Chem Sydney NSW 2006 Australia;

    Univ Wollongong Inst Superconducting & Elect Mat ISEM Australian Inst Innovat Mat AIIM Sch Mech Mat Mechatron & Biomed Engn Wollongong NSW 2522 Australia|Shanghai Univ Engn Sci Coll Chem & Chem Engn Shanghai 201620 Peoples R China;

    Univ Wollongong Inst Superconducting & Elect Mat ISEM Australian Inst Innovat Mat AIIM Sch Mech Mat Mechatron & Biomed Engn Wollongong NSW 2522 Australia;

    Univ Wollongong Inst Superconducting & Elect Mat ISEM Australian Inst Innovat Mat AIIM Sch Mech Mat Mechatron & Biomed Engn Wollongong NSW 2522 Australia;

    Univ Wollongong Inst Superconducting & Elect Mat ISEM Australian Inst Innovat Mat AIIM Sch Mech Mat Mechatron & Biomed Engn Wollongong NSW 2522 Australia|Dalian Univ Technol Key Lab Mat Modificat Laser Ion & Electron Beams Dalian 116024 Peoples R China;

    Univ Sydney Sch Chem Sydney NSW 2006 Australia;

    Univ Wollongong Inst Superconducting & Elect Mat ISEM Australian Inst Innovat Mat AIIM Sch Mech Mat Mechatron & Biomed Engn Wollongong NSW 2522 Australia;

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  • 正文语种 eng
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  • 关键词

    acetate-based electrolytes; dendrite-free Zn anodes; Mn4+; Mn(2+)redox reactions; salt anion chemistry; Zn; MnO(2)batteries;

    机译：基于醋酸乙酸的电解质;树枝状无Zn阳极;Mn4 +;Mn（2+）氧化还原反应;盐阴离子化学;Zn;MnO（2）电池;

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