Conventional lithium-ion batteries that utilize high melting point ethylene carbonate(EC)solvent and graphite anodes exhibit a narrow operating temperature range,which is insufficient to meet the wide-temperature requ...Conventional lithium-ion batteries that utilize high melting point ethylene carbonate(EC)solvent and graphite anodes exhibit a narrow operating temperature range,which is insufficient to meet the wide-temperature requirements of electric vehicle power batteries.Herein,a novel electrolyte featuring an anion-enriched solvation structure is developed by incorporating ethyl difluoroacetate(DFAE),a fluorinated solvent with wide liquid range and weak solvation capability,which enables the stable operation of lithium metal batteries(LMBs)over a broad temperature range(–50℃to 60℃).The anion-enrich solvation structure facilitates rapid desolvation and enables the formation of inorganic-dominated interphases on both the cathode and anode surfaces.NMC811||DEF||Li cells exhibit a high specific capacity of 194.7 mAh·g^(-1)at a 2 C rate and room temperature,retaining 77.16%capacity after 400 cycles.The pouch cell using DEF electrolyte successfully powered an LED panel at–50℃,demonstrating practical viability.This innovative strategy provides a promising pathway for the development of next generation wide-temperature LMBs.展开更多
基金National Outstanding Youth Science Fund(52222314)Scientific Research Innovation Capability Support Project for Young Faculty(ZYGXQNJSKYCXNLZCXM-M4)+1 种基金CNPC Innovation Found(2021DQ02-1001),Dalian OutstandingYouth Science and Technology Talent Project(2023RJ006)Dalian Science and Technology Innovation Project(2022JJ12GX022).
文摘Conventional lithium-ion batteries that utilize high melting point ethylene carbonate(EC)solvent and graphite anodes exhibit a narrow operating temperature range,which is insufficient to meet the wide-temperature requirements of electric vehicle power batteries.Herein,a novel electrolyte featuring an anion-enriched solvation structure is developed by incorporating ethyl difluoroacetate(DFAE),a fluorinated solvent with wide liquid range and weak solvation capability,which enables the stable operation of lithium metal batteries(LMBs)over a broad temperature range(–50℃to 60℃).The anion-enrich solvation structure facilitates rapid desolvation and enables the formation of inorganic-dominated interphases on both the cathode and anode surfaces.NMC811||DEF||Li cells exhibit a high specific capacity of 194.7 mAh·g^(-1)at a 2 C rate and room temperature,retaining 77.16%capacity after 400 cycles.The pouch cell using DEF electrolyte successfully powered an LED panel at–50℃,demonstrating practical viability.This innovative strategy provides a promising pathway for the development of next generation wide-temperature LMBs.
