Investigating oxidative stability of lithium-ion battery electrolytes using synthetic charge-discharge profile voltammetry

IF 5.4 Q2 CHEMISTRY, PHYSICAL
Alma Mathew, M. Lacey, D. Brandell
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引用次数: 7

Abstract

Among the many properties which determine the applicability of a Li-ion battery electrolyte, electrochemical stability is a key parameter to consider. The conventional linear sweep voltammetry (LSV) technique often leads to an over-estimation of oxidative stability. In this study, an alternative approach termed Synthetic Charge-discharge Profile Voltammetry (SCPV) is explored to investigate oxidative electrolyte stability. We have found this to be a convenient method of quantifying the anodic stability of the electrolyte in a more practically representative manner, in which passivation kinetics and electrode potential changes at the electrode-electrolyte interface are more appropriately reproduced. The viability of this technique is explored with liquid electrolytes based on ether, carbonate, sulfone, and carbonate-sulfone mixtures, all with LiPF6 salt, tested for a potential profile equivalent to LiNi0.5Mn1.5O4 electrodes. The credibility of this technique is validated by correlations to the coulombic efficiencies of corresponding half-cells.
利用合成充放电曲线伏安法研究锂离子电池电解质的氧化稳定性
在决定锂离子电池电解液适用性的众多特性中,电化学稳定性是一个需要考虑的关键参数。传统的线性扫描伏安法(LSV)技术往往导致氧化稳定性的高估。在这项研究中,一种替代方法被称为合成充放电曲线伏安法(SCPV)被探索来研究氧化电解质的稳定性。我们发现这是一种方便的方法,以一种更实际的代表性的方式量化电解质的阳极稳定性,其中钝化动力学和电极电位在电极-电解质界面的变化更适当地再现。该技术的可行性与基于乙醚、碳酸盐、砜和碳酸盐-砜混合物的液体电解质进行了探讨,所有液体电解质都含有LiPF6盐,测试了相当于LiNi0.5Mn1.5O4电极的电位分布。通过与相应半电池的库仑效率的相关性验证了该技术的可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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