首页|Synergistic coupling among Mg2B2O5,polycarbonate and N,N-dimethylformamide enhances the electrochemical performance of PVDF-HFP-based solid electrolyte
Synergistic coupling among Mg2B2O5,polycarbonate and N,N-dimethylformamide enhances the electrochemical performance of PVDF-HFP-based solid electrolyte
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Polymer solid electrolytes(SPEs)based on the[solvate-Li+]complex structure have promising prospects in lithium metal batteries(LMBs)due to their unique ion transport mechanism.However,the solvation structure may compromise the mechanical performance and safety,hindering practical application of SPEs.In this work,a composite solid electrolyte(CSE)is designed through the organic-inorganic syner-gistic interaction among N,N-dimethylformamide(DMF),polycarbonate(PC),and Mg2B2O5 in poly(vinyli-dene fluoride-co-hexafluoropropylene)(PVDF-HFP).Flame-retardant Mg2B2O5 nanowires provide non-flammability to the prepared CSEs,and the addition of PC improves the dispersion of Mg2B2O5 nanowires.Simultaneously,the organic-inorganic synergistic action of PC plasticizer and Mg2B2O5 nanowires pro-motes the dissociation degree of LiTFSI and reduces the crystallinity of PVDF-HFP,enabling rapid Li ion transport.Additionally,Raman spectroscopy and DFT calculations confirm the coordination between Mg atoms in Mg2B2O5 and N atoms in DMF,which exhibits Lewis base-like behavior attacking adjacent C-F and C-H bonds in PVDF-HFP while inducing dehydrofluorination of PVDF-HFP.Based on the syner-gistic coupling of Mg2B2O5,PC,and DMF in the PVDF-HFP matrix,the prepared CSE exhibits superior ion conductivity(9.78 × 10-4 S cm-1).The assembled Li symmetric cells cycle stably for 3900 h at a current density of 0.1 mA cm-2 without short circuit.The LFP||Li cells assembled with PDL-Mg2B2O5/PC CSEs show excellent rate capability and cycling performance,with a capacity retention of 83.3％after 1000 cycles at 0.5 C.This work provides a novel approach for the practical application of organic-inorganic synergistic CSEs in LMBs.
Composite solid electrolytesSafe Li metal batteriesSynergistic coupling effectPoly(vinylidene fluoride-co-hexafluoropro pylene)
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,State Key Laboratory of Urban Water Resource and Environment,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China
Institute of Energy Material Science,University of Shanghai for Science and Technology,Shanghai 200093,China
Institute for Superconducting & Electronic Materials,Australian Institute of Innovative Materials,University of Wollongong,Wollongong,NSW 2500,Australia
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Heilongjiang Province
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