Solid-state electrolytes(SSEs),which replace flammable and toxic liquid electrolytes,have attracted widely attention.However,there exist still some challenges in actual application such as poor interfacial compatibili...Solid-state electrolytes(SSEs),which replace flammable and toxic liquid electrolytes,have attracted widely attention.However,there exist still some challenges in actual application such as poor interfacial compatibility and slow ionic migration.In this study,Mg O nanofibers and MgF;nanofibers were prepared via the electro-blow spinning and high-temperature calcination methods,and were applied to all-solid-state lithium metal batteries for the first time.The organic-inorganic composite SSEs exhibited continuous conduction paths based on the virtue of the nanofibers with high length-to-diameter ratio,which were designed and prepared by mixing prepared fillers into the poly(ethylene oxide)(PEO)/lithium bis(trifluoromethane)sulfonilimide(Li TFSI)system.The effect of filler with different morphologies,doping ratios and component on ionic conductivity,electrochemical stability and cycle performance were explored under two kinds of[EO]/[Li^(+)]ratios and ambient temperatures.The ionic conductivities of electrolytes containing Mg O and MgF;nanofibers can reach up to 1.19×10^(-4) and 1.39×10^(-4) S cm^(-1) at 30℃,respectively.They were attributed to specific ionic conductive enhancement at the organicinorganic interface,reduced crystallinity and Lewis acid interaction,which can effectively promote the dissociation of the lithium salts.Especially MgF_(2) nanofiber,combining low electronic conductance,excellent electrochemical stability and outstanding inhibition for lithium dendrites of fluorides,endowed the battery with an initial specific capacity of 140.6 m Ah g^(-1) and capacity decay rate per cycle of 0.055%after500 cycles at 50℃.The work can provide an idea to design SSE with fast and multi-dimensional Li conductive paths and excellent interfacial compatibility.展开更多
Based on mechanics to design hollow plastic parison shape,this paper adopted computer and programmable logic controllers(PLCs) to build a three level system,finish the CAD of parison,and control the blow molding seque...Based on mechanics to design hollow plastic parison shape,this paper adopted computer and programmable logic controllers(PLCs) to build a three level system,finish the CAD of parison,and control the blow molding sequentially.Parison thickness was controlled by an electro hydraulic proportional control system,which controls the gap between the parison and the nozzle during the extrusion process by regulating the position of the core bar.Both constant pressure and speed control systems were adopted to control the process of plastic storing and extrusion,and PLC,such as C200H and CQM1,fuzzy modules were adopted.The results show that the part quality of blow molding can be improved greatly.展开更多
基金supported by the National Natural Science Foundation of China(grant No.51973157)the Special Grade of the Financial Support from the China Postdoctoral Science Foundation(grant No.2020T130469)+2 种基金the Tianjin Municipal University Students’Innovation and Entrepreneurship Training Program Project(grant No.201910058036)the Science and Technology Plans of Tianjin(grant No.19PTSYJC00010)the Science&Technology Development Fund of Tianjin Education Commission for Higher Education(grant No.2018KJ196)。
文摘Solid-state electrolytes(SSEs),which replace flammable and toxic liquid electrolytes,have attracted widely attention.However,there exist still some challenges in actual application such as poor interfacial compatibility and slow ionic migration.In this study,Mg O nanofibers and MgF;nanofibers were prepared via the electro-blow spinning and high-temperature calcination methods,and were applied to all-solid-state lithium metal batteries for the first time.The organic-inorganic composite SSEs exhibited continuous conduction paths based on the virtue of the nanofibers with high length-to-diameter ratio,which were designed and prepared by mixing prepared fillers into the poly(ethylene oxide)(PEO)/lithium bis(trifluoromethane)sulfonilimide(Li TFSI)system.The effect of filler with different morphologies,doping ratios and component on ionic conductivity,electrochemical stability and cycle performance were explored under two kinds of[EO]/[Li^(+)]ratios and ambient temperatures.The ionic conductivities of electrolytes containing Mg O and MgF;nanofibers can reach up to 1.19×10^(-4) and 1.39×10^(-4) S cm^(-1) at 30℃,respectively.They were attributed to specific ionic conductive enhancement at the organicinorganic interface,reduced crystallinity and Lewis acid interaction,which can effectively promote the dissociation of the lithium salts.Especially MgF_(2) nanofiber,combining low electronic conductance,excellent electrochemical stability and outstanding inhibition for lithium dendrites of fluorides,endowed the battery with an initial specific capacity of 140.6 m Ah g^(-1) and capacity decay rate per cycle of 0.055%after500 cycles at 50℃.The work can provide an idea to design SSE with fast and multi-dimensional Li conductive paths and excellent interfacial compatibility.
文摘Based on mechanics to design hollow plastic parison shape,this paper adopted computer and programmable logic controllers(PLCs) to build a three level system,finish the CAD of parison,and control the blow molding sequentially.Parison thickness was controlled by an electro hydraulic proportional control system,which controls the gap between the parison and the nozzle during the extrusion process by regulating the position of the core bar.Both constant pressure and speed control systems were adopted to control the process of plastic storing and extrusion,and PLC,such as C200H and CQM1,fuzzy modules were adopted.The results show that the part quality of blow molding can be improved greatly.
