One effective approach to strike the balance between ionic conductivity and mechanical strength in polymer electrolytes involves the design of a coupled polymer molecular structure comprising both rigid and flexible p...One effective approach to strike the balance between ionic conductivity and mechanical strength in polymer electrolytes involves the design of a coupled polymer molecular structure comprising both rigid and flexible phases.Nevertheless,the regulation of intermolecular interactions between plasticizers and rigid and flexible phases has been largely overlooked.Here,an intermolecular interaction engineering strategy is carried out with well-chosen dual-plasticize within qua si-sol id-state polymer electrolytes(QSPEs).Succinonitrile exhibits a stronger affinity towards rigid phase hydrogenated nitrile butadiene rubber(HNBR),while propene carbonate demonstrates a stronger affinity towards flexible segments poly(propylene carbonate)(PPC).This tailored intermolecular interaction engineering allows for differential plasticization of the polymer's rigid and flexible phases,thereby achieving a balance between ionic conductivity and mechanical strength.The QSPE have both higher ionic conductivity(1.04×10^(-4)S cm^(-1)at 30℃),t_(Li+)(0.55),and tensile strength(0.76 MPa).Li//Li symmetric cells maintaining performance over1100 h at 0.1 mA cm^(-2)and Li//LiFePO_(4)cells retaining 85.0%capacity after 700 cycles at 1.0 C.It is a unique angle to employ intermolecular interaction engineering in QSPEs through dual-plasticizer approach combined with CO_(2)-based polymer materials.This sustainable strategy combining dual-plasticizer engineering with CO_(2)-based polymers,offers insights for designing high-performance,eco-friendly lithium metal batteries.展开更多
Based on the production curves,changes in hydrocarbon composition and quantities over time,and production systems from key trial production wells in lacustrine shale oil areas in China,fine fraction cutting experiment...Based on the production curves,changes in hydrocarbon composition and quantities over time,and production systems from key trial production wells in lacustrine shale oil areas in China,fine fraction cutting experiments and molecular dynamics numerical simulations were conducted to investigate the effects of changes in shale oil composition on macroscopic fluidity.The concept of“component flow”for shale oil was proposed,and the formation mechanism and conditions of component flow were discussed.The research reveals findings in four aspects.First,a miscible state of light,medium and heavy hydrocarbons form within micropores/nanopores of underground shale according to similarity and intermiscibility principles,which make components with poor fluidity suspended as molecular aggregates in light and medium hydrocarbon solvents,such as heavy hydrocarbons,thereby decreasing shale oil viscosity and enhancing fluidity and outflows.Second,small-molecule aromatic hydrocarbons act as carriers for component flow,and the higher the content of gaseous and light hydrocarbons,the more conducive it is to inhibit the formation of larger aggregates of heavy components such as resin and asphalt,thus increasing their plastic deformation ability and bringing about better component flow efficiency.Third,higher formation temperatures reduce the viscosity of heavy hydrocarbon components,such as wax,thereby improving their fluidity.Fourth,preservation conditions,formation energy,and production system play important roles in controlling the content of light hydrocarbon components,outflow rate,and forming stable“component flow”,which are crucial factors for the optimal compatibility and maximum flow rate of multi-component hydrocarbons in shale oil.The component flow of underground shale oil is significant for improving single-well production and the cumulative ultimate recovery of shale oil.展开更多
基金supported by the National Key Research and Development Program(2019YFA0705701)National Natural Science Foundation of China(22075329,22008267,21978332 and 22179149)+1 种基金Research and Development Project of Henan Academy Sciences China(232018002)Guangdong Basic and Applied Basic Research Foundation(2021A1515010731)。
文摘One effective approach to strike the balance between ionic conductivity and mechanical strength in polymer electrolytes involves the design of a coupled polymer molecular structure comprising both rigid and flexible phases.Nevertheless,the regulation of intermolecular interactions between plasticizers and rigid and flexible phases has been largely overlooked.Here,an intermolecular interaction engineering strategy is carried out with well-chosen dual-plasticize within qua si-sol id-state polymer electrolytes(QSPEs).Succinonitrile exhibits a stronger affinity towards rigid phase hydrogenated nitrile butadiene rubber(HNBR),while propene carbonate demonstrates a stronger affinity towards flexible segments poly(propylene carbonate)(PPC).This tailored intermolecular interaction engineering allows for differential plasticization of the polymer's rigid and flexible phases,thereby achieving a balance between ionic conductivity and mechanical strength.The QSPE have both higher ionic conductivity(1.04×10^(-4)S cm^(-1)at 30℃),t_(Li+)(0.55),and tensile strength(0.76 MPa).Li//Li symmetric cells maintaining performance over1100 h at 0.1 mA cm^(-2)and Li//LiFePO_(4)cells retaining 85.0%capacity after 700 cycles at 1.0 C.It is a unique angle to employ intermolecular interaction engineering in QSPEs through dual-plasticizer approach combined with CO_(2)-based polymer materials.This sustainable strategy combining dual-plasticizer engineering with CO_(2)-based polymers,offers insights for designing high-performance,eco-friendly lithium metal batteries.
基金Supported by the National Natural Science Foundation of China(U22B6004)Scientific Research and Technological Development Project of RIPED(2022yjcq03)Technology Research Project of PetroChina Changqing Oilfield Company(KJZX2023-01)。
文摘Based on the production curves,changes in hydrocarbon composition and quantities over time,and production systems from key trial production wells in lacustrine shale oil areas in China,fine fraction cutting experiments and molecular dynamics numerical simulations were conducted to investigate the effects of changes in shale oil composition on macroscopic fluidity.The concept of“component flow”for shale oil was proposed,and the formation mechanism and conditions of component flow were discussed.The research reveals findings in four aspects.First,a miscible state of light,medium and heavy hydrocarbons form within micropores/nanopores of underground shale according to similarity and intermiscibility principles,which make components with poor fluidity suspended as molecular aggregates in light and medium hydrocarbon solvents,such as heavy hydrocarbons,thereby decreasing shale oil viscosity and enhancing fluidity and outflows.Second,small-molecule aromatic hydrocarbons act as carriers for component flow,and the higher the content of gaseous and light hydrocarbons,the more conducive it is to inhibit the formation of larger aggregates of heavy components such as resin and asphalt,thus increasing their plastic deformation ability and bringing about better component flow efficiency.Third,higher formation temperatures reduce the viscosity of heavy hydrocarbon components,such as wax,thereby improving their fluidity.Fourth,preservation conditions,formation energy,and production system play important roles in controlling the content of light hydrocarbon components,outflow rate,and forming stable“component flow”,which are crucial factors for the optimal compatibility and maximum flow rate of multi-component hydrocarbons in shale oil.The component flow of underground shale oil is significant for improving single-well production and the cumulative ultimate recovery of shale oil.
