摘要：SummaryThe 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.Graphical AbstractDisplay OmittedMany of the polymer electrolytes that are used in solid-state batteries readily absorb solvents. Although solvents have been shown to be difficult to completely remove from these materials following typical preparation procedures, solvent content tends to be under-reported. This review cautions that while absorbed solvents tend to increase the ionic conductivity and polymer crystallinity in solid polymer electrolytes, purposely adding them to electrolyte systems may decrease the performance of lithium-based electrodes.
