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首页> 外文期刊>Advanced energy materials >An Anion-Tuned Solid Electrolyte Interphase with Fast Ion Transfer Kinetics for Stable Lithium Anodes
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An Anion-Tuned Solid Electrolyte Interphase with Fast Ion Transfer Kinetics for Stable Lithium Anodes

机译：稳定的锂阳极的阴离子调谐固体电解质界面，具有快速的离子转移动力学。

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摘要

The spatial distribution and transport characteristics of lithium ions (Li+) in the electrochemical interface region of a lithium anode in a lithium ion battery directly determine Li+ deposition behavior. The regulation of the Li+ solvation sheath on the solid electrolyte interphase (SEI) by electrolyte chemistry is key but challenging. Here, 1 m lithium trifluoroacetate (LiTFA) is induced to the electrolyte to regulate the Li+ solvation sheath, which significantly suppresses Li dendrite formation and enables a high Coulombic efficiency of 98.8% over 500 cycles. With its strong coordination between the carbonyl groups (C(sic)O) and Li+, TFA(-) modulates the environment of the Li+ solvation sheath and facilitates fast desolvation kinetics. In addition, due to relatively smaller lowest unoccupied molecular orbital energy than solvents, TFA(-) has a preferential reduction to produce a stable SEI with uniform distribution of LiF and Li2O. Such stable SEI effectively reduces the energy barrier for Li+ diffusion, contributing to low nucleation overpotential, fast ion transfer kinetics, and uniform Li+ deposition with high cycling stability. This work provides an alternative insight into the design of interface chemistry in terms of regulating anions in the Li+ solvation sheath. It is anticipated that this anion-tuned strategy will pave the way to construct stable SEIs for other battery systems.
机译：锂离子电池中锂阳极的电化学界面区域中锂离子（Li +）的空间分布和传输特性直接决定了Li +的沉积行为。通过电解质化学对固体电解质中间相（SEI）上Li +溶剂化鞘的调节是关键但具有挑战性。在此，将1 m三氟乙酸锂（LiTFA）引入电解液中以调节Li +溶剂化鞘层，从而显着抑制Li树枝状晶体的形成，并在500个循环中实现98.8％的高库仑效率。由于其在羰基（C（sic）O）和Li +之间的强配位，TFA（-）调节Li +溶剂化鞘的环境并促进快速去溶剂化动力学。另外，由于与溶剂相比，最低的未占据分子轨道能量相对较小，因此TFA（-）具有优先降低的能力，以产生稳定的SEI，且LiF和Li2O分布均匀。这种稳定的SEI有效地降低了Li +扩散的能垒，有助于实现低成核超电势，快速的离子迁移动力学以及具有高循环稳定性的均匀Li +沉积。这项工作就调节Li +溶剂化鞘中的阴离子而言，为界面化学设计提供了另一种见解。可以预料，这种阴离子调节的策略将为构建用于其他电池系统的稳定SEI铺平道路。

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  • 来源
    《Advanced energy materials》 |2020年第14期|1903843.1-1903843.9|共9页
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    Chinese Acad Sci Inst Met Res Shenyang Natl Lab Mat Sci 72 Wenhua Rd Shenyang 110016 Peoples R China|Univ Sci & Technol China Sch Mat Sci & Engn Hefei 230026 Peoples R China;

    Chinese Acad Sci Inst Met Res Shenyang Natl Lab Mat Sci 72 Wenhua Rd Shenyang 110016 Peoples R China;

    Univ Sci & Technol Liaoning Sch Chem Engn Anshan 114051 Peoples R China;

    Chinese Acad Sci Inst Met Res Shenyang Natl Lab Mat Sci 72 Wenhua Rd Shenyang 110016 Peoples R China|Tsinghua Univ Tsinghua Berkeley Shenzhen Inst Shenzhen Geim Graphene Ctr Shenzhen 518055 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    anions; energy barriers; lithium metal anodes; solid electrolyte interphase; solvation sheaths;

    机译：阴离子能源壁垒;锂金属阳极;固体电解质相间溶剂化护套;

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