Foran Gabrielle, Mankovsky Denis, Verdier Nina, Lepage David, Prébé Arnaud, Aymé-Perrot David, Dollé Mickaël
Département de Chimie, Université de Montréal, 1375 Avenue Thérèse-Lavoie-Roux, Montréal, Québec H2V 0B3, Canada.
Prospective Lab, Total SA, Paris La Défense 92069, France.
iScience. 2020 Sep 21;23(10):101597. doi: 10.1016/j.isci.2020.101597. eCollection 2020 Oct 23.
The effects of solvent absorption on the electrochemical and mechanical properties of polymer electrolytes for use in solid-state batteries have been measured by researchers since the 1980s. These studies have shown that small amounts of absorbed solvent may increase ion mobility and decrease crystallinity in these materials. Even though many polymers and lithium salts are hygroscopic, the solvent content of these materials is rarely reported. As ppm-level solvent content may have important consequences for the lithium conductivity and crystallinity of these electrolytes, more widespread reporting is recommended. Here we illustrate that ppm-level solvent content can significantly increase ion mobility, and therefore the reported performance, in solid polymer electrolytes. Additionally, the impact of absorbed solvents on other battery components has not been widely investigated in all-solid-state battery systems. Therefore, comparisons will be made with systems that use liquid electrolytes to better understand the consequences of absorbed solvents on electrode performance.
自20世纪80年代以来，研究人员一直在测量溶剂吸收对用于固态电池的聚合物电解质的电化学和机械性能的影响。这些研究表明，少量吸收的溶剂可能会增加这些材料中的离子迁移率并降低结晶度。尽管许多聚合物和锂盐具有吸湿性，但这些材料的溶剂含量却鲜有报道。由于百万分之一级别的溶剂含量可能会对这些电解质的锂电导率和结晶度产生重要影响，因此建议更广泛地进行报告。在此我们表明，百万分之一级别的溶剂含量可显著提高固体聚合物电解质中的离子迁移率，进而提高所报道的性能。此外，在全固态电池系统中，吸收的溶剂对其他电池组件的影响尚未得到广泛研究。因此，将与使用液体电解质的系统进行比较，以更好地了解吸收的溶剂对电极性能的影响。
