The formation of lithium dendrites and the safety hazards arising from flammable liquid electrolytes have seriously hindered the development of high-energy-density lithium metal batteries.Herein,an emerging amide-base...The formation of lithium dendrites and the safety hazards arising from flammable liquid electrolytes have seriously hindered the development of high-energy-density lithium metal batteries.Herein,an emerging amide-based electrolyte is proposed,containing LiTFSI and butyrolactam in different molar ratios.1,1,2,2-Tetrafluoroethyl-2,2,3,3-tetrafluoropropylether and fluoroethylene carbonate are introduced into the amide-based electrolyte as counter solvent and additives.The well-designed amide-based electrolyte possesses nonflammability,high ionic conductivity,high thermal stability and electrochemical stability(>4.7 V).Besides,an inorganic/organic-rich solid electrolyte interphase with an abundance of LiF,Li3N and Li-N-C is in situ formed,leading to spherical lithium deposition.The formation mechanism and solvation chemistry of amide-based electrolyte are further inves-tigated by molecular dynamics simulations and density functional theory.When applied in Li metal batteries with LiFePO4 and LiMn2O4 cathode,the amide-based electrolyte can enable stable cycling performance at room temperature and 60℃.This study provides a new insight into the development of amide-based electrolytes for lithium metal batteries.展开更多
Two ligands 2,2＇-[2,3-naphthylenebis（oxy）]-bis（N-benzyl（acetamide））（L1） and 2,2＇-[2,3-naphthylenebis （oxy）]-bis（N,N-diphenyl （acetamide））（L2） and their europium（Ill） picrate complexes were synthesi...Two ligands 2,2＇-[2,3-naphthylenebis（oxy）]-bis（N-benzyl（acetamide））（L1） and 2,2＇-[2,3-naphthylenebis （oxy）]-bis（N,N-diphenyl （acetamide））（L2） and their europium（Ill） picrate complexes were synthesized. The complexes were characterized by elemental analysis, inf,- red （IR）, thermogravimetry and differential thermal analysis （TG-DTA） and molar conductivity. Fluorescent experiments showed that the resonance level of the Eu（III） matched better to the triplet state energy level of the ligand L2 than that of the ligand L1 and the fluorescence in- tensities of the complexes were reduced with the raising coordination ability of solvent. In addition, the interactions between the complexes and DNA were studied by means of spectrometry and cyclic voltammetry. The results suggested that the complexes could bind to DNA through intercalation and the complex 1 binded to DNA more strongly than the complex 2.展开更多
基金supported by the National Natural Science Foundation of China(21905069,52002094)the Shenzhen Science and Technology Innovation Committee(JCYJ20180507183907224,KQTD20170809110344233)+2 种基金the Economic,Trade and Information Commission of Shenzhen Municipality through the Graphene Manufacture Innovation Center(201901161514)the Guangdong Province Covid-19 Pandemic Control Research Fund(2020KZDZX1220)the School Research Startup Expenses of Harbin Institute of Technology(Shenzhen)(DD29100027).
文摘The formation of lithium dendrites and the safety hazards arising from flammable liquid electrolytes have seriously hindered the development of high-energy-density lithium metal batteries.Herein,an emerging amide-based electrolyte is proposed,containing LiTFSI and butyrolactam in different molar ratios.1,1,2,2-Tetrafluoroethyl-2,2,3,3-tetrafluoropropylether and fluoroethylene carbonate are introduced into the amide-based electrolyte as counter solvent and additives.The well-designed amide-based electrolyte possesses nonflammability,high ionic conductivity,high thermal stability and electrochemical stability(>4.7 V).Besides,an inorganic/organic-rich solid electrolyte interphase with an abundance of LiF,Li3N and Li-N-C is in situ formed,leading to spherical lithium deposition.The formation mechanism and solvation chemistry of amide-based electrolyte are further inves-tigated by molecular dynamics simulations and density functional theory.When applied in Li metal batteries with LiFePO4 and LiMn2O4 cathode,the amide-based electrolyte can enable stable cycling performance at room temperature and 60℃.This study provides a new insight into the development of amide-based electrolytes for lithium metal batteries.
基金Project supported by National Natural Science Foundation of China (20962016)the Key Research Foundation of Education Ministry of China (208159)
文摘Two ligands 2,2＇-[2,3-naphthylenebis（oxy）]-bis（N-benzyl（acetamide））（L1） and 2,2＇-[2,3-naphthylenebis （oxy）]-bis（N,N-diphenyl （acetamide））（L2） and their europium（Ill） picrate complexes were synthesized. The complexes were characterized by elemental analysis, inf,- red （IR）, thermogravimetry and differential thermal analysis （TG-DTA） and molar conductivity. Fluorescent experiments showed that the resonance level of the Eu（III） matched better to the triplet state energy level of the ligand L2 than that of the ligand L1 and the fluorescence in- tensities of the complexes were reduced with the raising coordination ability of solvent. In addition, the interactions between the complexes and DNA were studied by means of spectrometry and cyclic voltammetry. The results suggested that the complexes could bind to DNA through intercalation and the complex 1 binded to DNA more strongly than the complex 2.
