Multiple regression equations of liquidus temperature, electrical conductivity and bath density of the Na_3AlF_6-AlF_3-BaC1_2-NaCl system were obtained from experiments by using orthogonal regression method. The exper...Multiple regression equations of liquidus temperature, electrical conductivity and bath density of the Na_3AlF_6-AlF_3-BaC1_2-NaCl system were obtained from experiments by using orthogonal regression method. The experiments were carried out in 100A cell with low melting point electrolyte, the influences of cathodic current density, electrolytic temperature, density differences of bath and liquid aluminum on current efficiency (CE) were studied; when the electrolyte cryolite ratio was 2.5, w(BaC1_2) and w(NaCl) were 48% and 10%, respectively, CE reached 90% and specific energy consumption was 10.97k Wb/kg/kg. Because of the fact that aluminum metal obtained floated on the surface of molten electrolyte, this electrolysis method was then defined as low temperature aluminum floating electrolysis. The results showed that the new low temperature aluminum electrolysis process in the Na_3AlF_6-AlF_3-BaC1_2-NaCl bath system was practical and promising.展开更多
This study innovatively proposes a“chemical prelithiation/alloying-induced interfacial reconstruction”synergistic strategy that fundamentally improves the performance of Si-based anodes.Through a precisely controlle...This study innovatively proposes a“chemical prelithiation/alloying-induced interfacial reconstruction”synergistic strategy that fundamentally improves the performance of Si-based anodes.Through a precisely controlled process leveraging orbital energetics and Lewis acid catalysis,we successfully engineer a Li-Al-F phase on the interface of SiO(denoted as Pre-SiO-Al)anodes via sequential chemical prelithiation and AlF_(3)-driven interfacial alloying reactions.This novel approach breaks through the ion transport limitations of traditional LiF-dominated solid electrolyte interphase(SEI)layers,while concurrently addressing the critical challenges of low initial Coulombic efficiency(ICE)and severe volume expansion.Mechanism studies reveal that the Li-Al-F offers an ultralow Li^(+)diffusion barrier(0.1 eV),significantly enhancing interfacial ion transport kinetics.Meanwhile,the high mechanical strength and dynamic stress dissipation capability of LiAl-F effectively suppress SEI fracture caused by volume expansion,enabling coordinated deformation compatibility between the electrode and the interfacial layer.The Pre-SiO-Al anode maintains a high capacity of 682.6 m A h g^(-1)after 2000 cycles at 1.0 A g^(-1)with near 100% capacity retention.When paired with LiFePO_(4)cathode,the Pre-SiO-Al||LFP full cell achieves impressive rate capability and cycling stability(93.8% capacity retention after 150 cycles at 0.5 C),demonstrating strong commercialization potential.展开更多
An artificial solid electrolyte interphase(SEI)with lithiophilic sites and chemical bonds anchoring lithium polysulfides(LiPSs)has been developed as a potential solution to protect the lithium(Li)metal anode of Lithiu...An artificial solid electrolyte interphase(SEI)with lithiophilic sites and chemical bonds anchoring lithium polysulfides(LiPSs)has been developed as a potential solution to protect the lithium(Li)metal anode of Lithium-sulfur(Li-S)batteries.This strategy aims to guide consistent Li deposition and relieve lithium corrosion.Herein,the evolution process of lithiophilic sites based on aluminum fluoride(AlF_(3))in an artificial SEI is disclosed in Li-S batteries with metal-based lithiophilic sites.The polyester polymer(PMMA and PPC)/AlF_(3) artificial SEI(MPAF-SEI)was homogeneously anchored on Li anode by in-situ polymerization.The conversion of AlF_(3) into Li-Al and LiF lithiophilic sites effectively reduce the Li nucleation overpotential and prevents the formation of Li dendrites.At the same time,the polymer can anchor LiPSs by chemical bonds and prevents Li corrosion.The optimized MPAF-SEI protected Li demonstrates excellent stability for over 3000 h at a capacity of 1 mAh cm^(-2) in Li||Li symmetric cells.The Li-S battery with low N/P(4)exhibits a capacity of 532.6 mAh g^(-1) over 300 cycles lifespan at 0.5 C.展开更多
基金The project was financially supported by the National Natural Science Foundation of China! (Gmnt No.59574018)China Postdocto
文摘Multiple regression equations of liquidus temperature, electrical conductivity and bath density of the Na_3AlF_6-AlF_3-BaC1_2-NaCl system were obtained from experiments by using orthogonal regression method. The experiments were carried out in 100A cell with low melting point electrolyte, the influences of cathodic current density, electrolytic temperature, density differences of bath and liquid aluminum on current efficiency (CE) were studied; when the electrolyte cryolite ratio was 2.5, w(BaC1_2) and w(NaCl) were 48% and 10%, respectively, CE reached 90% and specific energy consumption was 10.97k Wb/kg/kg. Because of the fact that aluminum metal obtained floated on the surface of molten electrolyte, this electrolysis method was then defined as low temperature aluminum floating electrolysis. The results showed that the new low temperature aluminum electrolysis process in the Na_3AlF_6-AlF_3-BaC1_2-NaCl bath system was practical and promising.
基金the financial support from the National Natural Science Foundation of China(NSFC,No.22308067)the Nature Science Foundation of Guangxi(2025GXNSFBA069166)+2 种基金the Guangxi“Universal Support for Young Talents”Scientific Research Project(ZX02080030424007)the Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology(2022Z009)the Innovation Project of Guangxi Graduate Education(YCSW2024131)。
文摘This study innovatively proposes a“chemical prelithiation/alloying-induced interfacial reconstruction”synergistic strategy that fundamentally improves the performance of Si-based anodes.Through a precisely controlled process leveraging orbital energetics and Lewis acid catalysis,we successfully engineer a Li-Al-F phase on the interface of SiO(denoted as Pre-SiO-Al)anodes via sequential chemical prelithiation and AlF_(3)-driven interfacial alloying reactions.This novel approach breaks through the ion transport limitations of traditional LiF-dominated solid electrolyte interphase(SEI)layers,while concurrently addressing the critical challenges of low initial Coulombic efficiency(ICE)and severe volume expansion.Mechanism studies reveal that the Li-Al-F offers an ultralow Li^(+)diffusion barrier(0.1 eV),significantly enhancing interfacial ion transport kinetics.Meanwhile,the high mechanical strength and dynamic stress dissipation capability of LiAl-F effectively suppress SEI fracture caused by volume expansion,enabling coordinated deformation compatibility between the electrode and the interfacial layer.The Pre-SiO-Al anode maintains a high capacity of 682.6 m A h g^(-1)after 2000 cycles at 1.0 A g^(-1)with near 100% capacity retention.When paired with LiFePO_(4)cathode,the Pre-SiO-Al||LFP full cell achieves impressive rate capability and cycling stability(93.8% capacity retention after 150 cycles at 0.5 C),demonstrating strong commercialization potential.
基金supported by the Jilin Province Science and Technology Department Program(Nos.YDZJ202201-ZYTS304,20220201130GX and 20240101004JJ)the National Natural Science Foundation of China(Nos.52171210 and 52471229)the Science and Technology Project of Jilin Provincial Education Department(No.JJKH20220428KJ).
文摘An artificial solid electrolyte interphase(SEI)with lithiophilic sites and chemical bonds anchoring lithium polysulfides(LiPSs)has been developed as a potential solution to protect the lithium(Li)metal anode of Lithium-sulfur(Li-S)batteries.This strategy aims to guide consistent Li deposition and relieve lithium corrosion.Herein,the evolution process of lithiophilic sites based on aluminum fluoride(AlF_(3))in an artificial SEI is disclosed in Li-S batteries with metal-based lithiophilic sites.The polyester polymer(PMMA and PPC)/AlF_(3) artificial SEI(MPAF-SEI)was homogeneously anchored on Li anode by in-situ polymerization.The conversion of AlF_(3) into Li-Al and LiF lithiophilic sites effectively reduce the Li nucleation overpotential and prevents the formation of Li dendrites.At the same time,the polymer can anchor LiPSs by chemical bonds and prevents Li corrosion.The optimized MPAF-SEI protected Li demonstrates excellent stability for over 3000 h at a capacity of 1 mAh cm^(-2) in Li||Li symmetric cells.The Li-S battery with low N/P(4)exhibits a capacity of 532.6 mAh g^(-1) over 300 cycles lifespan at 0.5 C.
