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首页> 外文期刊>Advanced Functional Materials >Fluorobenzene, A Low-Density, Economical, and Bifunctional Hydrocarbon Cosolvent for Practical Lithium Metal Batteries
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Fluorobenzene, A Low-Density, Economical, and Bifunctional Hydrocarbon Cosolvent for Practical Lithium Metal Batteries

机译：氟苯，低密度，经济，和双官能烃类化合物，用于实用锂金属电池

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摘要

Highly concentrated electrolytes (HCEs) significantly improve the stability of lithium metal anodes, but applications are often impeded by their limitation of density, viscosity, and cost. Here, fluorobenzene (FB), an economical hydrocarbon with low density and low viscosity, is demonstrated as a bifunctional cosolvent to obtain a novel FB diluted highly concentrated electrolyte (FB-DHCE). First, the addition of FB suppresses the decomposition of dimethoxyethane (DME) on the Li metal by strengthening the interactions of DME and FSI(-)around Li+. Second, FB efficiently elevates the content of LiF in the solid electrolyte interphase (SEI) based on its electrochemical reduction reaction. The unique solvation and interfacial chemistry of FB-DHCE enable dendrite-free deposition of lithium with high Coulombic efficiency (up to 99.3%) and prolong cycling life (over 500 cycles at 1 mA cm(-2)). The performance of FB-DHCE is further demonstrated in full cells under practical conditions, including ambient to low temperature (-20 degrees C), high areal capacity (7.6 mAh cm(-2)), high current density (3 mA cm(-2)), limited excess Li (20 mu m Li), and lean electrolyte (3 g Ah(-1)). Employing FB as a cosolvent not only opens a novel pathway to stabilize Li metal anodes, but also could greatly advance the development of Li metal batteries.
机译：高度浓缩的电解质（HCE）显着提高了锂金属阳极的稳定性，但通常通过限制密度，粘度和成本来阻碍应用。这里，氟苯（FB）是具有低密度和低粘度的经济性烃，作为双官能的共溶剂，得到新型FB稀释的高浓度电解质（FB-DHCE）。首先，通过强化DME和FSI（ - ）周围Li +的相互作用，添加Fb的添加抑制了在Li金属上的二甲氧基乙烷（DME）的分解。其次，基于其电化学还原反应，FB有效地升高了固体电解质间（SEI）中的LIF含量。 FB-DHCE的独特溶剂化和界面化学能够使锂酸锂的衍生高（高达99.3％）和延长循环寿命（在1 mA cm（-2）上超过500次循环）。在实际条件下，在整个细胞中进一步证明FB-DHCE的性能，包括低温（-20℃），高面积容量（7.6mAh（-2）），高电流密度（3 mA cm（ - 2）），有限过量Li（20μmL）和稀电解质（3g Ah（-1））。使用FB作为辅助溶剂不仅打开了一种新的途径来稳定Li金属阳极，而且可以大大推进Li金属电池的发育。

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  • 来源
    《Advanced Functional Materials》 |2021年第1期|2005991.1-2005991.9|共9页
  • 作者

    Jiang Zhipeng; Zeng Ziqi; Liang Xinmiao; Yang Li; Hu Wei; Zhang Ce; Han Zhilong; Feng Jiwen; Xie Jia;

  • 作者单位

    Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China|Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China;

    Chinese Acad Sci Wuhan Inst Phys & Math Natl Ctr Magnet Resonance Wuhan State Key Lab Magnet Resonance & Atom & Mol Phys Wuhan 430071 Hubei Peoples R China;

    Chinese Acad Sci Wuhan Inst Phys & Math Natl Ctr Magnet Resonance Wuhan State Key Lab Magnet Resonance & Atom & Mol Phys Wuhan 430071 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China|Huazhong Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China;

    Chinese Acad Sci Wuhan Inst Phys & Math Natl Ctr Magnet Resonance Wuhan State Key Lab Magnet Resonance & Atom & Mol Phys Wuhan 430071 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China;

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  • 关键词

    batteries; diluted highly concentrated electrolytes; lithium metal anodes; low cost cosolvents;

    机译：电池;稀释高浓度的电解质;锂金属阳极;低成本的共溶剂;

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