The low-temperature fabrication of hard carbon is of significant importance for the development of lithium-ion batteries towards grid-scale energy storage.Despite their high capacity and coulombic efficiency,conventio...The low-temperature fabrication of hard carbon is of significant importance for the development of lithium-ion batteries towards grid-scale energy storage.Despite their high capacity and coulombic efficiency,conventional methods suffer from high pyrolysis temperatures and/or complex procedures,resulting in high costs.Herein,we innovatively proposed a catalytic microdomain engineering strategy,where 3-aminophenol was initially coordinated with Fe^(3+)ions and then polymerized to formaldehyde,forming a catalytic microdomain composed of[Fe(3-AP)_(x)]^(3+)units within the resin precursor.Material characterization suggests the uniform chemical composition of the resin precursor,and in situ DRIFT spectra revealed that the resin precursor features a low N-C-O rearrangement temperature,enabling low-temperature fabrication of high-performance hard carbon.Experimentally,FeOC-400 delivered a high reversible capacity of 566 mAh g^(-1) after 250 cycles at 0.1 A g^(-1) and a capacity retention of 95.6%after 5000 cycles at 10.0 A g^(-1),endowing the FeOC-400||LFP full cell with a high energy density of over 175.7 Wh kg^(-1)(based on the total mass of FeOC-400 and LFP).The findings of this study can provide new insight into the design of high-capacity and fast-charging hard carbon,and the catalytic microdomain engineering strategy is applicable to the low-cost fabrication of hard carbon towards grid-scale energy devices.展开更多
基金the financial support of the Natural Science Research Project of Anhui Educational Committee(2023AH050189)the Doctoral Scientific Research Startup Foundation of Anhui Jianzhu University(Grant No.2022QDZ01)+2 种基金the Open Project Program of Key Laboratory of Functional Molecular Solids of Ministry of Education(FMS2023004)Anhui Province International Research Center on Advanced Building Materials(Grant No.JZCL2303ZR)Anhui Institute of Strategic Study on Carbon Dioxide Emissions Peak and Carbon Neutrality in Urban-Rural Development(Grant No.STY-2023-05).
文摘The low-temperature fabrication of hard carbon is of significant importance for the development of lithium-ion batteries towards grid-scale energy storage.Despite their high capacity and coulombic efficiency,conventional methods suffer from high pyrolysis temperatures and/or complex procedures,resulting in high costs.Herein,we innovatively proposed a catalytic microdomain engineering strategy,where 3-aminophenol was initially coordinated with Fe^(3+)ions and then polymerized to formaldehyde,forming a catalytic microdomain composed of[Fe(3-AP)_(x)]^(3+)units within the resin precursor.Material characterization suggests the uniform chemical composition of the resin precursor,and in situ DRIFT spectra revealed that the resin precursor features a low N-C-O rearrangement temperature,enabling low-temperature fabrication of high-performance hard carbon.Experimentally,FeOC-400 delivered a high reversible capacity of 566 mAh g^(-1) after 250 cycles at 0.1 A g^(-1) and a capacity retention of 95.6%after 5000 cycles at 10.0 A g^(-1),endowing the FeOC-400||LFP full cell with a high energy density of over 175.7 Wh kg^(-1)(based on the total mass of FeOC-400 and LFP).The findings of this study can provide new insight into the design of high-capacity and fast-charging hard carbon,and the catalytic microdomain engineering strategy is applicable to the low-cost fabrication of hard carbon towards grid-scale energy devices.
