Highly Concentrated KTFSI : Glyme Electrolytes for K/Bilayered‐V2O5 Batteries,Batteries & Supercaps

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Highly Concentrated KTFSI : Glyme Electrolytes for K/Bilayered‐V2O5 Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-01-22 , DOI: 10.1002/batt.202000003
Xu Liu _{1,

2} , Giuseppe Antonio Elia _{1,

2} , Xinpei Gao _{1,

2} , Bingsheng Qin _{1,

2} , Huang Zhang _{1,

2} , Stefano Passerini _{1,

2}

Affiliation

Highly concentrated glyme‐based electrolytes are friendly to a series of negative electrodes for potassium‐based batteries, including potassium metal. However, their compatibility with positive electrodes has been rarely explored. In this work, the influence of the molar fraction of potassium bis(trifluoromethanesulfonyl)imide dissolved in glyme on the cycling ability of K/bilayered‐V₂O₅ batteries has been investigated. At high salt concentration, the interaction between K⁺ ions with the glyme is strengthened, leading to a limited number of free glyme molecules. Therefore, the anodic decomposition of the electrolyte solvent, as well as the dissolution of the Al current collectors, is effectively suppressed, resulting in the improved cycling ability of the K/bilayered‐V₂O₅ cells. In these cells, the positive electrode active material exhibits reversible capacities of 93 and 57 mAh g⁻¹ at specific current densities of 50 and 1000 mA g⁻¹, respectively. After 200 charge‐discharge cycles at 500 mA g⁻¹, the cell retains 94 % of the initial capacity. The promising rate performance and capacity retention demonstrate the importance of proper electrolyte engineering for the K/bilayered‐V₂O₅ batteries, and the good compatibility of highly concentrated glyme‐based electrolytes with positive electrode materials for potassium batteries.

中文翻译：

高浓度KTFSI：用于K /双层V2O5电池的甘氨酸电解质

高浓度的基于乙二醇的电解质与一系列钾离子电池负极（包括金属钾）友好。但是，很少探讨它们与正极的相容性。在这项工作中，研究了溶解在甘醇二甲醚中的双（三氟甲磺酰基）亚胺钾的摩尔分数对K /双层V ₂ O ₅电池循环能力的影响。在高盐浓度下，K ⁺之间的相互作用甘醇二甲醚的离子被强化，导致有限数量的游离甘醇二甲醚分子。因此，可以有效地抑制电解质溶剂的阳极分解以及Al集电器的溶解，从而提高K /双层V ₂ O ₅电池的循环能力。在这些电池中，在50和1000mA g ^-1的特定电流密度下，正极活性材料分别显示出93和57 mAh g ^-1的可逆容量。经过500 mA g ^-1的200次充放电循环后，电池将保留初始容量的94％。令人鼓舞的速率性能和容量保持率证明了适当的电解质工程对于K /双层V ₂ O ₅电池的重要性，以及高浓度基于甘醇二甲醚的电解质与钾电池正极材料的良好相容性。

更新日期：2020-01-23

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