Küpers Verena, Dohmann Jan Frederik, Bieker Peter, Winter Martin, Placke Tobias, Kolek Martin
MEET Battery Research Center, Institute of Physical Chemistry, University of Münster, Corrensstraße 46, 48149, Münster, Germany.
Helmholtz Institute Münster (HI MS), IEK-12, Forschungszentrum Jülich GmbH, Corrensstrasse 46, 48149, Münster, Germany.
ChemSusChem. 2021 Oct 20;14(20):4480-4498. doi: 10.1002/cssc.202101227. Epub 2021 Sep 2.
Dual-ion batteries (DIBs) offer a great alternative to state-of-the-art lithium-ion batteries, based on their high promises due to the absence of transition metals and the use of low-cost materials, which could make them economically favorable targeting stationary energy storage applications. In addition, they are not limited by certain metal cations, and DIBs with a broad variety of utilized ions could be demonstrated over the last years. Herein, a systematic study of different electrolyte approaches for Mg-ion-based DIBs was conducted. A side-by-side comparison of Li- and Mg-ion-based electrolytes using activated carbon as negative electrode revealed the opportunities but also limitations of Mg-ion-based DIBs. Ethylene sulfite was successfully introduced as electrolyte additive and increased the specific discharge capacity significantly up to 93±2 mAh g with coulombic efficiencies over 99 % and an excellent capacity retention of 88 % after 400 cycles. In addition, and for the first time, highly concentrated carbonate-based electrolytes were employed for Mg-ion-based DIBs, showing adequate discharge capacities and high coulombic efficiencies.
双离子电池（DIBs）为最先进的锂离子电池提供了一个很好的替代方案，基于其因不含过渡金属和使用低成本材料而具有的巨大潜力，这可能使它们在针对固定储能应用方面具有经济优势。此外，它们不受某些金属阳离子的限制，并且在过去几年中可以展示出使用各种不同离子的双离子电池。在此，对基于镁离子的双离子电池的不同电解质方法进行了系统研究。使用活性炭作为负极对基于锂离子和镁离子的电解质进行并排比较，揭示了基于镁离子的双离子电池的机遇和局限性。成功引入亚硫酸乙烯酯作为电解质添加剂，将比放电容量显著提高到93±2 mAh g，库仑效率超过99%，并且在400次循环后具有88%的出色容量保持率。此外，首次将高浓度碳酸盐基电解质用于基于镁离子的双离子电池，显示出足够的放电容量和高库仑效率。
