Ionic Liquids as Cathode Additives for High Voltage Lithium Batteries

IF 5.1 4区 材料科学 Q2 ELECTROCHEMISTRY
Matteo Palluzzi, Dr. Akiko Tsurumaki, Dr. Nataliia Mozhzhukhina, Josef Rizell, Prof. Aleksandar Matic, Prof. Paola D'Angelo, Prof. Maria Assunta Navarra
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Abstract

Two oxalatoborate ionic liquids (ILs), which are commonly utilized as electrolyte additives that form a protective layer on the cathode surface, are investigated for the first time as electrode additives. Cathodes based on LiNi0.5Mn1.5O4 (LNMO) containing 3 wt % ILs, i. e., “IL-enriched cathodes”, exhibit capacity values above 120 mAh/g with high Coulombic efficiencies throughout cycling over 200 times. A cathode without ILs also exhibits a capacity of 119 mAh/g but its Coulombic efficiency becomes low and unstable after 109 cycles. In addition, when 0.3 M ILs are added to conventional carbonate-based electrolytes, the battery cycle life improves but there is a reduction in the capacity probably due to low ionic conductivity of the electrolyte mixtures. Post-mortem analyses of electrodes retrieved from cycled cells highlight less electrolyte decomposition and less cathode corrosion, enabled by using the IL as the additive in LNMO, which are confirmed by a particle shape with smooth surface identical to the fresh cathode. The study demonstrates that oxalatoborate ILs can be used as the electrode additive, and this provides a new concept for cathode formulations for high performance batteries with a small amount of ILs.

Abstract Image

离子液体作为高压锂电池的阴极添加剂
两种草酸硼离子液体(IL)通常用作电解质添加剂,在阴极表面形成保护层,本研究首次将其用作电极添加剂。基于含有 3 wt% ILs 的 LiNi0.5Mn1.5O4 (LNMO) 阴极(即 "富含 IL 的阴极")在超过 200 次的循环过程中显示出高于 120 mAh/g 的容量值和较高的库仑效率。不含 IL 的阴极也能显示 119 mAh/g 的容量,但其库仑效率在循环 109 次后变得很低且不稳定。此外,在传统的碳酸盐基电解质中添加 0.3 M IL 时,电池的循环寿命有所提高,但容量却有所降低,这可能是由于电解质混合物的离子传导性较低所致。对从循环电池中取出的电极进行的死后分析表明,在 LNMO 中使用 IL 作为添加剂可减少电解质分解和阴极腐蚀。该研究证明草酸硼酸盐 IL 可用作电极添加剂,这为使用少量 IL 的高性能电池阴极配方提供了一个新概念。
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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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