Anion-reduction catalytic centres regulate interfacial solvation structures for fast-charging Si anodes (opens in new tab)

Anion-rich interfacial solvation structures (ISS) are critical for stable fast charging of anodes. Here we propose interfacial anion-reduction catalysis as a new paradigm, in which catalytic centres regulate the ISS to direct solid electrolyte interphase formation. Using S vacancies as prototypical catalytic sites, we demonstrate that electrostatic potential wells induced by these centres attract bis(fluorosulfonyl)imide (FSI−) to the interface and form contact ion pairs during charging, crea...