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While the SEI composition in HCEs differs from that in dilute electrolytes, the specific anion\u2010mediated reaction network driving this transformation remain poorly understood. The network complexity and transient nature of the radical intermediates involved have precluded the development of a comprehensive mechanistic map of initial SEI formation. Here, the reaction networks governing anion\u2010mediated electrolyte degradation are established using automated reaction discovery and microkinetic modeling (MKM). The study encompasses the decomposition pathways of ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), and acetonitrile (AN) in the presence of reduced anion species derived from LiFSI and LiTFSI. The results reveal a kinetically accessible landscape for solvent decomposition driven by fluoride () and  fragments, identifying specific pathways that favor the formation of inorganic LiF and open\u2010ring organic carbonates. Microkinetic modeling further indicates that  acts as a rapidly consumed driver, shifting the product distribution toward thermodynamically stable fluoro\u2010organic species. These results provide a molecular\u2010level rationalization for the unique SEI chemistries observed in HCEs and suggest that tuning the anion\u2010solvent interaction is a viable pathway for controlling interphase\u00a0growth.<\/jats:p>","DOI":"10.1002\/aenm.71634","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T10:16:05Z","timestamp":1792059365000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Anion\u2010Driven Solvent Degradation Networks in High\u2010Concentration Battery Electrolytes"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7275-8599","authenticated-orcid":false,"given":"Esra Ulgey","family":"Akgun","sequence":"first","affiliation":[{"name":"Davidson School of Chemical Engineering Purdue University West Lafayette Indiana 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