无氟双(乙醇酸)硼酸盐阴离子盐和电解质:结构、性质和锂相容性

IF 4.7 4区 材料科学 Q2 ELECTROCHEMISTRY
Yanqi Xu, Andrei Filippov, Manishkumar R. Shimpi, Faiz Ullah Shah, Patrik Johansson
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引用次数: 0

摘要

合成并表征了由Li+, Na+, K+, Mg2+和Ca2+阳离子组成的双(乙醇酸)硼酸盐(BGB)阴离子盐。基于LiBGB和有机溶剂,如二甲亚砜(DMSO)、磷酸三乙酯(TEP)和磷酸三甲酯(TMP)制备了无氟电解质,并对其输运性能、热稳定性和电化学稳定性以及锂相容性进行了测试。的离子导率1 M LiBGB-TEP和1 M LiBGB-TMP电解质ca。2 - 3次低于1米LiBGB-DMSO电解质(2.05,2.65和5.70厘米−1 25°C)女士,以及最先进的1 M锂方法相比在EC (LiPF6): 12月(EC: 12月= 1:1。卷,LP40)他们显示离子导率较低,但成型机的氧化还原稳定铝(Al)和玻璃碳电极更好。浓(1 M) LiBGB-DMSO电解质显示出增强的氧化还原稳定性,但更差的铝钝化。其中,1 M的LiBGB-TMP在0.1 mA/cm2下对锂的镀剥具有300 h以上的长期稳定性,但锂的相容性有待进一步提高。总体而言,本研究介绍了一系列用于一价和二价电池的多功能无氟邻硼酸盐和电解质,并对其传输和电化学特性有了基本的了解,旨在电池应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fluorine-Free Bis(glycolato)borate Anion-Based Salts and Electrolytes: Structures, Properties, and Lithium Compatibility

Fluorine-Free Bis(glycolato)borate Anion-Based Salts and Electrolytes: Structures, Properties, and Lithium Compatibility

A number of bis(glycolato)borate (BGB) anion-based salts, comprising Li+, Na+, K+, Mg2+ and Ca2+ cations, has been synthesized and characterized. Fluorine-free electrolytes based on LiBGB and organic solvents, such as dimethyl sulfoxide (DMSO), triethyl phosphate (TEP), and trimethyl phosphate (TMP) have been created and their transport properties, thermal and electrochemical stabilities, and lithium compatibility are examined. The ionic conductivities of the 1 M LiBGB-TEP and 1 M LiBGB-TMP electrolytes are ca. 2–3 times lower than for the 1 M LiBGB-DMSO electrolytes (2.05, 2.65 vs. 5.70 mS cm−1 at 25 °C), and as compared to the state-of-the-art 1 M lithium hexafluorophosphate (LiPF6) in EC:DEC (EC:DEC=1 : 1 in vol., LP40) they display lower ionic conductivities, but the formers’ redox stability on aluminum (Al) and glassy carbon electrodes are much better. Concentrated (>1 M) LiBGB-DMSO electrolytes display enhanced redox stability, but worse Al passivation. Among the electrolytes, 1 M LiBGB-TMP achieves the best long-term stability over 300 h at 0.1 mA/cm2 for Li plating-stripping while the Li compatibility needs to be further improved. Overall, this study introduces a family of versatile fluorine-free orthoborate salts and electrolytes for mono- and divalent batteries, and a fundamental understanding of their transport and electrochemical properties, aiming towards battery applications.

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来源期刊
CiteScore
8.60
自引率
5.30%
发文量
223
期刊介绍: Electrochemical energy storage devices play a transformative role in our societies. They have allowed the emergence of portable electronics devices, have triggered the resurgence of electric transportation and constitute key components in smart power grids. Batteries & Supercaps publishes international high-impact experimental and theoretical research on the fundamentals and applications of electrochemical energy storage. We support the scientific community to advance energy efficiency and sustainability.
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