High energy density lithium-ion batteries using Ni-rich cathode(such as LiNi0.6Co0.2Mn0.2O2) suffer from severe capacity decay.P-toluenesulfonyl fluoride(pTSF) has been investigated as a novel film-forming electrolyte...High energy density lithium-ion batteries using Ni-rich cathode(such as LiNi0.6Co0.2Mn0.2O2) suffer from severe capacity decay.P-toluenesulfonyl fluoride(pTSF) has been investigated as a novel film-forming electrolyte additive to enhance the cycling performances of graphite/LiNi0.6Co0.2Mn0.2O2 pouch cell.In comparison with the baseline electrolyte,a small dose of pTSF can significantly improve the cyclic stability of the cell.Theoretical calculations together with experimental results indicate that pTSF would be oxidized and reduced to construct protective interphase film on the surfaces of LiNi0.6Co0.2Mn0.2O2 cathode and graphite anode,respectively.These S-containing surface films derived from pTSF effectively mitigate the decomposition of electrolyte,reduce the interphasial impedance,as well as prevent the dissolution of transition metal ions from Ni-rich cathode upon cycling at high voltage.This finding is beneficial for the practical application of high energy density graphite/LiNi0.6Co0.2Mn0.2O2 cells.展开更多
With acetyl chloride as the solvent, the condensation reaction of p-toluenesulfonamide, an aromatic aldehyde and phenyldichlorophosphine gives a reactive intermediate, a-(p-toluenesulfonyl)-aminobenzylphosphinic chlor...With acetyl chloride as the solvent, the condensation reaction of p-toluenesulfonamide, an aromatic aldehyde and phenyldichlorophosphine gives a reactive intermediate, a-(p-toluenesulfonyl)-aminobenzylphosphinic chloride, which reacts with glycine ethyl ester to give the corresponding phos-phinopeptide (6) containing a P-N bond directly.展开更多
不引入有机溶剂,低温下将对甲苯磺酰氯与β-环糊精在NaOH水溶液中进行非均相反应,得到了单6-氧-对甲苯磺酰-β-环糊精酯(6-OTs-β-CD)。借助1 H NMR谱证实了环糊精单磺酰化机理。考察了产物的水解因素,研究了反应条件对产率的影响。实...不引入有机溶剂,低温下将对甲苯磺酰氯与β-环糊精在NaOH水溶液中进行非均相反应,得到了单6-氧-对甲苯磺酰-β-环糊精酯(6-OTs-β-CD)。借助1 H NMR谱证实了环糊精单磺酰化机理。考察了产物的水解因素,研究了反应条件对产率的影响。实验结果表明,投料摩尔比n(CD):n(TsCl)=4:1,碱液浓度0.75 mol/L,反应物质量分数4.7%,反应温度0℃,反应5 h时,6位单酯化收率为43.4%。展开更多
基金supported by the National Natural Science Foundation of China (21573080)the Guangdong Program for Support of Distinguished Young Scholar (2017B030306013)the Science and Technology Planning Project of Guangdong Province (2017B090901020)。
文摘High energy density lithium-ion batteries using Ni-rich cathode(such as LiNi0.6Co0.2Mn0.2O2) suffer from severe capacity decay.P-toluenesulfonyl fluoride(pTSF) has been investigated as a novel film-forming electrolyte additive to enhance the cycling performances of graphite/LiNi0.6Co0.2Mn0.2O2 pouch cell.In comparison with the baseline electrolyte,a small dose of pTSF can significantly improve the cyclic stability of the cell.Theoretical calculations together with experimental results indicate that pTSF would be oxidized and reduced to construct protective interphase film on the surfaces of LiNi0.6Co0.2Mn0.2O2 cathode and graphite anode,respectively.These S-containing surface films derived from pTSF effectively mitigate the decomposition of electrolyte,reduce the interphasial impedance,as well as prevent the dissolution of transition metal ions from Ni-rich cathode upon cycling at high voltage.This finding is beneficial for the practical application of high energy density graphite/LiNi0.6Co0.2Mn0.2O2 cells.
基金Project supported by the National Natural Science Foundation of China.
文摘With acetyl chloride as the solvent, the condensation reaction of p-toluenesulfonamide, an aromatic aldehyde and phenyldichlorophosphine gives a reactive intermediate, a-(p-toluenesulfonyl)-aminobenzylphosphinic chloride, which reacts with glycine ethyl ester to give the corresponding phos-phinopeptide (6) containing a P-N bond directly.
文摘不引入有机溶剂,低温下将对甲苯磺酰氯与β-环糊精在NaOH水溶液中进行非均相反应,得到了单6-氧-对甲苯磺酰-β-环糊精酯(6-OTs-β-CD)。借助1 H NMR谱证实了环糊精单磺酰化机理。考察了产物的水解因素,研究了反应条件对产率的影响。实验结果表明,投料摩尔比n(CD):n(TsCl)=4:1,碱液浓度0.75 mol/L,反应物质量分数4.7%,反应温度0℃,反应5 h时,6位单酯化收率为43.4%。
