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首页> 外文期刊>Advanced Functional Materials >Mixed-Valence Copper Selenide as an Anode for Ultralong Lifespan Rocking-Chair Zn-lon Batteries: An Insight into its Intercalation/Extraction Kinetics and Charge Storage Mechanism
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Mixed-Valence Copper Selenide as an Anode for Ultralong Lifespan Rocking-Chair Zn-lon Batteries: An Insight into its Intercalation/Extraction Kinetics and Charge Storage Mechanism

机译：混合价铜硒化型为超级寿命摇椅Zn-Lon电池的阳极：洞察其嵌入/提取动力学和电荷储存机构

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摘要

Environment-friendly and low-cost aqueous zinc-ion batteries (ZIBs) have received considerable attention for large-scale energy storage. However, the low coulombic efficiency and potential safety hazards of Zn-metal anodes severely hinder their practical implementations. Herein, for the first time, mixed-valence Cu2-xSe is proposed as a new intercalation anode to construct Zn-metal-free rocking-chair ZIBs with a long lifespan. It is found that the introduction of low-valence Cu not only modify active sites for Zn(2+)ion storage, but also optimizes the electronic interaction between the active sites and the intercalated Zn(2+)ion, leading to a favorable intercalation formation energy (-0.68 eV) and reduced diffusion barrier, as demonstrated by first-principles calculation. Ex situ X-ray diffraction, ex situ transmission electron microscopy and galvanostatic intermittent titration technique measurements reveal the reversible insertion/extraction of Zn(2+)in Cu2-xSe via an intercalation reaction mechanism. Owing to the rigid host structure and facile Zn(2+)diffusion kinetics, the Cu2-xSe nanorod anode shows an enhanced coulombic efficiency (above 99.5%), outstanding rate capability and excellent cycling stability. The as-fabricated ZnxMnO2||Cu2-xSe Zn-ion full battery exhibits an impressive electrochemical performance, particularly an ultralong cycle life of over 20000 cycles at 2 A g(-1). This study is expected to provide new opportunities for developing high-performance rechargeable aqueous ZIBs.
机译：环境友好且低成本的锌离子电池（ZIBS）对大规模储能有相当大的关注。然而，Zn-Metal阳极的低库仑效率和潜在的安全危害严重阻碍了它们的实际实施。在此，首次提出混合价CU2-XSE作为一种新的插层阳极，以构建具有长寿命的Zn-金属的摇椅柱。结果发现，低价CU的引入不仅改变Zn（2+）离子储存的活性位点，还可以优化有源点和插入Zn（2+）离子之间的电子相互作用，导致良好的插入通过第一原理计算所证明的形成能量（-0.68eV）和降低的扩散屏障。 EX原位X射线衍射，EX原位透射电子显微镜和电镀间歇性滴定技术测量揭示了通过插层反应机制在Cu2-XSE中的可逆插入/提取。由于刚性宿主结构和容易Zn（2+）扩散动力学，Cu2-XSE纳米杆阳极显示出增强的库仑效率（高于99.5％），出色的速率能力和优异的循环稳定性。 AS制造的ZnXMNO2 || Cu2-XSE Zn离子全电池表现出令人印象深刻的电化学性能，特别是在2Ag（-1）时超过20000次循环的超长循环寿命。预计本研究将为开发高性能可充电水柱提供新的机会。

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  • 来源
    《Advanced Functional Materials》 |2021年第3期|2005092.1-2005092.10|共10页
  • 作者

    Yang Yang; Xiao Jinfei; Cai Jinyan; Wang Gongming; Du Wencheng; Zhang Yufei; Lu Xihong; Li Cheng Chao;

  • 作者单位

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

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

    Univ Sci & Technol China Hefei Natl Lab Phys Sci Microscale Hefei 230026 Anhui Peoples R China|Univ Sci & Technol China Dept Chem Hefei 230026 Anhui Peoples R China;

    Univ Sci & Technol China Hefei Natl Lab Phys Sci Microscale Hefei 230026 Anhui Peoples R China|Univ Sci & Technol China Dept Chem Hefei 230026 Anhui Peoples R China;

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

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

    Sun Yat Sen Univ Sch Chem MOE Key Lab Bioinorgan & Synthet Chem KLGH Environm & Energy Chem Key Lab Low Carbon Ch Guangzhou 510275 Peoples R China;

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

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  • 正文语种 eng
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  • 关键词

    anodes; mixed-valence copper selenide; rocking-chair batteries; ultra-long lifespans; zinc-ion batteries;

    机译：阳极;混合价铜硒化型;摇椅电池;超长寿命;锌离子电池;

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