Localized high-concentration electrolytes offer a potential solution for achieving uniform lithium deposition and a stable solid-electrolyte interface in Lithium metal batteries.However,the use of highly concentrated ...Localized high-concentration electrolytes offer a potential solution for achieving uniform lithium deposition and a stable solid-electrolyte interface in Lithium metal batteries.However,the use of highly concentrated salts or structure-loaded diluents can result in significantly higher production costs and increased environmental burdens.Herein,a novel localized high-concentration electrolyte is developed,comprising ultra-low content(2%by mass)triethylammonium chloride as an electrolyte additive.The stable Lewis acid structure of the triethylammonium chloride molecule allows for the adsorption of numerous solvent molecules and TFSI^(-)anions,intensifying the electrostatic interactions between lithium ions and anions.The chloride ions introduced by TC,along with TFSI^(–)anions,integrate into the solvent sheath,forming a LiCl-rich inorganic SEI and enhancing the electrochemical performance of the lithium metal anode.The improved Li||Li cell shows excellent cycling stability for over 500 h at 1 mA cm^(2)with a 27 mV overpotential.This work provides insights into the impact of electrolyte additives on the electrode-electrolyte interface and Li-ion solvation,crucial for safer lithium metal battery development.展开更多
基金financially supported by Niedersachsisches Ministerium für Wissenschaft und Kultur,via the Research Training Group"CircularLIB"and the program"Nanomaterials and Quantum Technology for Digital Transformation"(hsn-digital)the support from China Scholarship Council+1 种基金the research support from Chongqing Institute of Green and Intelligent Technology(No.E2906216)Open Access funding enabled and organized by Projekt DEAL.
文摘Localized high-concentration electrolytes offer a potential solution for achieving uniform lithium deposition and a stable solid-electrolyte interface in Lithium metal batteries.However,the use of highly concentrated salts or structure-loaded diluents can result in significantly higher production costs and increased environmental burdens.Herein,a novel localized high-concentration electrolyte is developed,comprising ultra-low content(2%by mass)triethylammonium chloride as an electrolyte additive.The stable Lewis acid structure of the triethylammonium chloride molecule allows for the adsorption of numerous solvent molecules and TFSI^(-)anions,intensifying the electrostatic interactions between lithium ions and anions.The chloride ions introduced by TC,along with TFSI^(–)anions,integrate into the solvent sheath,forming a LiCl-rich inorganic SEI and enhancing the electrochemical performance of the lithium metal anode.The improved Li||Li cell shows excellent cycling stability for over 500 h at 1 mA cm^(2)with a 27 mV overpotential.This work provides insights into the impact of electrolyte additives on the electrode-electrolyte interface and Li-ion solvation,crucial for safer lithium metal battery development.
