The Cover Feature illustrates the shift from traditional (–)-menthol extraction from mint to synthetic menthol production, driven by the rising demand across the pharmaceuticals, cosmetics, and food industries. In their Research Article (DOI: <a target="_blank"
 title="Link to external resource"
 href="http://doi.wiley.com/10.1002/cssc.202500515">10.1002/cssc.202500515</a>), M. Eisenacher and co-workers introduce an innovative, sustainable synthesis method for (–)-menthol, using renewable turpentine as an alternative to predominantly fossil-based raw materials, offering a greener solution for this key aroma compound.

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Cover Feature: From Turpentine to (−)‐Menthol: A New Approach (ChemSusChem 17/2025)

The Cover Feature illustrates the shift from traditional (–)-menthol extraction from mint to synthetic menthol production, driven by the rising demand across the pharmaceuticals, cosmetics, and food industries. In their Research Article (DOI: 10.1002/cssc.202500515), M. Eisenacher and co-workers...

The crucial challenges of poly (ethylene oxide)-based solid polymer electrolytes are first presented and followed by a comprehensive review on the design concepts, different types of additives, and their corresponding working mechanisms. Finally, the future research directions of additive strategies are also highlighted to enable safer and longer-term all-solid-state lithium metal batteries.
 
Poly (ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) are considered one of the most promising electrolytes for all-solid-state lithium metal batteries (ASSLMBs) due to their satisfactory mechanical properties, superior processability, excellent flexibility, and thermal stability. However, the low ionic conductivity at room temperature, the undesired growth of lithium dendrites and solid electrolyte interphase chemistry at the Li/PEO-based SPEs interface, as well as facile decomposition under high-voltage conditions impede their further application. Currently, most researchers devote their interest to the incorporation of various fillers or molecular modification strategies to overcome the mentioned obstacle. Nevertheless, none of them achieve the improvement of these properties meanwhile. Therefore, tailoring additive designs for PEO-based SPEs has been demonstrated to be a successful and operable strategy to simultaneously improve their ionic conductivity and regulate the interfacial chemistry. In this review, the crucial challenges of PEO-SPEs are first presented and followed by a comprehensive review on the design concepts, different types of additives, and their corresponding working mechanisms. Finally, the future research directions of additive strategies are also highlighted to enable safer and longer-term ASSLMBs.

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Cover Feature: From Turpentine to (−)‐Menthol: A New Approach (ChemSusChem 17/2025)

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Additives Tailored Design for More Durable Polyethylene Oxide‐Based Solid Electrolytes: A Crucial Review

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