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The link to the paper is hidden a few links into the article (what's up with all these 'tags' that they link to?):

"A Recyclable Inert Inorganic Framework Assisted Solid-State Electrolyte for Long-Life Aluminum Ion Batteries", https://pubs.acs.org/doi/10.1021/acscentsci.4c01615 (Open Access)

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Seems to be fluoro-chemistry; use of AIF3 and Fluoroethylene carbonate. The F ion sets off alarm bells, but I have no idea whether this is significantly more toxic than the corresponding chemistry of regular Li batteries.

Lithium tetrafluoroborate and hexafluorophosphate are quite common ingredients in lithium battery electrolytes.

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