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Here, a high\u2010voltage nonaqueous membrane\u2010free Li\u2013organic hybrid flow battery was constructed using a biphasic electrolyte. The bottom\u2010phase anolyte is a deep eutectic solvent formed by lithium hexafluorophosphate and 2,2,2\u2010trifluoroacetamide, which provides a wide electrochemical stability window of 4.81\u00a0V, low viscosity of 13.8 cP, high ionic conductivity of 8.59 mS\u00b7cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    , and stable compatibility with lithium metal. The top\u2010phase catholyte is dichloromethane containing a long\u2010alkyl\u2010chain phenothiazine derivative, which exhibits excellent redox reversibility and strict confinement in the upper phase. The biphasic system achieved an open\u2010circuit voltage of approximately 3.6\u00a0V and stable operation at 0.5\u00a0M concentration, retaining 85.6% of theoretical capacity with a Coulombic efficiency of 97.6% after 100 cycles. In flow configuration, the 0.5\u00a0M battery maintained over 92% capacity after 10 days of continuous cycling with minimal self\u2010discharge. A preliminary cost estimation yielded $134.8 kWh\n                    <jats:sup>\u22121<\/jats:sup>\n                    , which is lower than vanadium redox flow batteries, and both electrolyte phases displayed strong flame resistance. This study provides a viable design strategy to enable membrane\u2010free nonaqueous Li\u2013organic hybrid flow battery by leveraging eutectic lithium chemistry and immiscible solvent interfaces.\n                  <\/jats:p>","DOI":"10.1002\/anie.8407735","type":"journal-article","created":{"date-parts":[[2026,7,25]],"date-time":"2026-07-25T04:04:04Z","timestamp":1784952244000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A High\u2010Voltage Membrane\u2010Free Li\u2013Organic Hybrid Flow Battery Using Eutectic Lithium Chemistry"],"prefix":"10.1002","volume":"65","author":[{"given":"Xiao","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Cincinnati, P.O. 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