高比能电池中的全氟局部高浓度电解液研究OA

Lithium metal anodes paired with lithium-rich manganese-based(LLOs)cathodes are ideal for high-energy-density batteries exceeding 600 Wh/kg.To address high reactivity and high voltage characteristics,a molecular synergistic regulation strategy was employed,a fully fluorinated localized high-concentration electrolyte(DFD)composed of 2,2-difluoroethyl acetate(DFEA),fluoroethylene carbonate(FEC),fluoromethyl hexafluoroisopropyl ether(D3),and lithium bis(fluorosulfonyl)imide(LiFSI).Theoretical and experimental results demonstrate that weakly solvating and oxidation-resistant DFEA promoted FSI-incorporation into the primary solvation sheath of Li+,forming con-tact ion pairs(CIPs)and aggregates(AGGs).FEC was preferentially reduced to build a LiF-rich and dense solid electrolyte interphase(SEI),D3 reduces viscosity and improves wettability.The DFD elec-trolyte exhibits a wide electrochemical window,enabling Li||LLO cells cycled stably for 150 cycles at 4.6 V.A 12.8 Ah pouch cell delivering 608 Wh/kg retains 64.5%capacity after 100 cycles under high loading,lean electrolyte,and low N/P ratio,highlighting significant application potential.