Rechargeable lithium-based battery is hailed as next-generation high-energy-density battery systems.However, growth of lithium dendrites, shuttle effect of lithium polysulfides intermediates and unstable interphase of...Rechargeable lithium-based battery is hailed as next-generation high-energy-density battery systems.However, growth of lithium dendrites, shuttle effect of lithium polysulfides intermediates and unstable interphase of high-voltage intercalation-type cathodes largely prevent their practical deployment.Herein, to fully conquer the three challenges via one strategy, a novel electrolyte with highlycoordinated solvation structure-in-nonsolvent is designed. On account of the particular electrolyte structure, the shuttle effect is completely suppressed by quasi-solid conversion of S species in Li-S batteries,with a stable cycle performance even at lean electrolyte(5μL mg^(-1)). Simultaneously, in-situ-formed highly-fluorinated interphases can not only lower Li+diffusion barrier to ensure uniform nucleation of Li but also improve stability of NCM cathodes, which enable excellent capacity retention of Lik LiNi(0.5)Co(0.2)Mn(0.3)O2 batteries under conditions toward practical applications(high loading of 2.7 m Ah cm^(-2) and lean electrolyte of 5 m L Ah^(-1)). Besides, the electrolyte is also nonflammable. This electrolyte structure offers useful guidelines for the design of novel organic electrolytes for practical lithium-based batteries.展开更多
TS-1 zeolites with different grain sizes were prepared under hydrothermal conditions by tuning the amount of template agent,chelating agent,and temperature,which were further used as supports for the NiMo/TS-1 catalys...TS-1 zeolites with different grain sizes were prepared under hydrothermal conditions by tuning the amount of template agent,chelating agent,and temperature,which were further used as supports for the NiMo/TS-1 catalysts.The optimization of synthesis conditions has achieved controllable synthesis of grain sizes from nano-scale to micron-scale.TS-1 with smaller grain sizes possess larger specific surface area,external specific surface area,and pore volume,which can effectively shorten the diffusion path of the sulfide with complex structure.Nanoscale TS-1 has more highly-coordinated Ti species,acting as electronic additives to increase the sulfidation degree of the catalyst.Nano-scale NiMo/TS-1 exhibits higher acidity,which is beneficial for hydrodesulfurization(HDS)reactions.Among the series of NiMo/TS-1 catalysts,NiMo/TS-1(120 nm)catalyst exhibits the highest dibenzothiophene(DBT,88.4%)and 4,6-dimethylbenzothiophene(4,6-DMDBT,62.1%)HDS activities.展开更多
基金financial support from the National Key Research and Development Program of China (2018YFB0104200)。
文摘Rechargeable lithium-based battery is hailed as next-generation high-energy-density battery systems.However, growth of lithium dendrites, shuttle effect of lithium polysulfides intermediates and unstable interphase of high-voltage intercalation-type cathodes largely prevent their practical deployment.Herein, to fully conquer the three challenges via one strategy, a novel electrolyte with highlycoordinated solvation structure-in-nonsolvent is designed. On account of the particular electrolyte structure, the shuttle effect is completely suppressed by quasi-solid conversion of S species in Li-S batteries,with a stable cycle performance even at lean electrolyte(5μL mg^(-1)). Simultaneously, in-situ-formed highly-fluorinated interphases can not only lower Li+diffusion barrier to ensure uniform nucleation of Li but also improve stability of NCM cathodes, which enable excellent capacity retention of Lik LiNi(0.5)Co(0.2)Mn(0.3)O2 batteries under conditions toward practical applications(high loading of 2.7 m Ah cm^(-2) and lean electrolyte of 5 m L Ah^(-1)). Besides, the electrolyte is also nonflammable. This electrolyte structure offers useful guidelines for the design of novel organic electrolytes for practical lithium-based batteries.
基金sponsored by the National Natural Science Foundation of China(No.22308381 and 22402093)Science Foundation of China University of Petroleum-Beijing(No.2462023QNXZ002 and 2462023QNXZ005)the Special Foundation of Nanyang Normal University(No.2024ZX003).
文摘TS-1 zeolites with different grain sizes were prepared under hydrothermal conditions by tuning the amount of template agent,chelating agent,and temperature,which were further used as supports for the NiMo/TS-1 catalysts.The optimization of synthesis conditions has achieved controllable synthesis of grain sizes from nano-scale to micron-scale.TS-1 with smaller grain sizes possess larger specific surface area,external specific surface area,and pore volume,which can effectively shorten the diffusion path of the sulfide with complex structure.Nanoscale TS-1 has more highly-coordinated Ti species,acting as electronic additives to increase the sulfidation degree of the catalyst.Nano-scale NiMo/TS-1 exhibits higher acidity,which is beneficial for hydrodesulfurization(HDS)reactions.Among the series of NiMo/TS-1 catalysts,NiMo/TS-1(120 nm)catalyst exhibits the highest dibenzothiophene(DBT,88.4%)and 4,6-dimethylbenzothiophene(4,6-DMDBT,62.1%)HDS activities.
