Tuning of hybrid highly concentrated electrolytes and the interfacial building for lithium-based cells,Journal of Materials Chemistry A

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Tuning of hybrid highly concentrated electrolytes and the interfacial building for lithium-based cells
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-11-24 , DOI: 10.1039/d2ta07985b
Jia-ning Duan ₁ , Qing Hou ₁ , Ru-ming Yuan ₁ , Jingmin Fan ₁ , Mingsen Zheng ₁ , Quanfeng Dong ₁

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Highly concentrated electrolytes (HCEs) are promising for the construction of advanced lithium metal secondary batteries through inhibiting lithium dendrites in kinetics and lithium protection with an anion-derived solid electrolyte interphase (SEI). The mixed-solvent strategy is effective for obtaining electrolytes with the required properties, and the tuning of their related proportions has great impact on the solvation structures and interface properties. In this work, to break through the limitation of the lithium salt solubility in fluoroethylene carbonate (FEC) and build the anion-derived SEI, acetonitrile (AN) was employed as an occupying agent to further decrease the mole ratio of FEC to anions. Thus, FEC–AN mixed solvent-based hybrid HCEs were systematically investigated. The reduced viscosity, improved ionic conductivity and enhanced oxidation stability of HCEs were obtained. At the optimal proportion, the expected SEI was achieved, ensuring high coulombic efficiency and long cycle stability of the lithium metal anode. This work shows the necessity of the mixed solvent regulation strategy for HCE improvement.

中文翻译：

混合高浓度电解质的调整和锂基电池的界面构建

高浓度电解质 (HCE) 通过抑制动力学中的锂枝晶和使用阴离子衍生的固体电解质界面 (SEI) 保护锂，有望用于构建先进的锂金属二次电池。混合溶剂策略对于获得具有所需性能的电解质是有效的，其相关比例的调整对溶剂化结构和界面性质有很大影响。在这项工作中，为了突破锂盐在氟代碳酸亚乙酯（FEC）中溶解度的限制并构建阴离子衍生的SEI，乙腈（AN）被用作占据剂以进一步降低FEC与阴离子的摩尔比。因此，系统地研究了基于 FEC-AN 混合溶剂的杂化 HCE。粘度降低，获得了改善的离子电导率和增强的HCE的氧化稳定性。在最佳比例下，实现了预期的SEI，确保了锂金属负极的高库仑效率和长循环稳定性。这项工作表明混合溶剂调节策略对于 HCE 改进的必要性。

更新日期：2022-11-28

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