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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引用次数: 0
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.
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。
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.