Low-cost and flexible solid polymer electrolytes are promising in all-solid-state Li-metal batteries with high energy density and safety.However,both the low room-temperature ionic conductivities and the small Li^(+)t...Low-cost and flexible solid polymer electrolytes are promising in all-solid-state Li-metal batteries with high energy density and safety.However,both the low room-temperature ionic conductivities and the small Li^(+)transference number of these electrolytes significantly increase the internal resistance and overpotential of the battery.Here,we introduce Gd-doped CeO_(2) nanowires with large surface area and rich surface oxygen vacancies to the polymer electrolyte to increase the interaction between Gd-doped CeO_(2) nanowires and polymer electrolytes,which promotes the Li-salt dissociation and increases the concentration of mobile Li ions in the composite polymer electrolytes.The optimized composite polymer electrolyte has a high Li-ion conductivity of 5×10^(-4)4 S cm^(-1) at 30℃ and a large Li+transference number of 0.47.Moreover,the composite polymer electrolytes have excellent compatibility with the metallic lithium anode and high-voltage LiNi_(0.8)Mn _(0.1)Co_(0.1)O_(2)(NMC)cathode,providing the stable cycling of all-solid-state batteries at high current densities.展开更多
The unstable Li/PEO-based electrolyte interface in allsolid-state lithium metal batteries usually leads to high interfacial resistance,low Coulombie efficiency and fast lithium dendrites growth even under a low curren...The unstable Li/PEO-based electrolyte interface in allsolid-state lithium metal batteries usually leads to high interfacial resistance,low Coulombie efficiency and fast lithium dendrites growth even under a low current density.The interface composition directly determines the interfacial integrity,dynamic Li^(+)/e^(-)transport processes and the subsequent Li+plating/stripping behavior;thus,it is of significance to regulate the interphase to have better safety and higher energy density for all-solid-state lithium metal batteries.Here,by incorporation of Li^+conducting LiTa_(2) PO_(8) fillers in PEO-based polymer electrolyte.展开更多
基金This work was supported by the National Natural Science Foundation of China (51973157,61904123)the Tianjin Natural Science Foundation (18JCQNJC02900)+3 种基金the Special Grade of the Financial Support from the China Postdoctoral Science Foundation (2020T130469)the Sci-ence and Technology Plans of Tianjin (19PTSYJC00010)the Science&Technol-ogy Development Fund of Tianjin Education Commission for Higher Education (2018KJ196)State Key Laboratory of Membrane and Membrane Separation,Tiangong University.
文摘Low-cost and flexible solid polymer electrolytes are promising in all-solid-state Li-metal batteries with high energy density and safety.However,both the low room-temperature ionic conductivities and the small Li^(+)transference number of these electrolytes significantly increase the internal resistance and overpotential of the battery.Here,we introduce Gd-doped CeO_(2) nanowires with large surface area and rich surface oxygen vacancies to the polymer electrolyte to increase the interaction between Gd-doped CeO_(2) nanowires and polymer electrolytes,which promotes the Li-salt dissociation and increases the concentration of mobile Li ions in the composite polymer electrolytes.The optimized composite polymer electrolyte has a high Li-ion conductivity of 5×10^(-4)4 S cm^(-1) at 30℃ and a large Li+transference number of 0.47.Moreover,the composite polymer electrolytes have excellent compatibility with the metallic lithium anode and high-voltage LiNi_(0.8)Mn _(0.1)Co_(0.1)O_(2)(NMC)cathode,providing the stable cycling of all-solid-state batteries at high current densities.
基金financially supported by the National Natural Science Foundation of China (Nos.51872159 and 51572145)Beijing Natural Science Foundation-Haidian Original Innovation Foundation (No.L172039)
文摘The unstable Li/PEO-based electrolyte interface in allsolid-state lithium metal batteries usually leads to high interfacial resistance,low Coulombie efficiency and fast lithium dendrites growth even under a low current density.The interface composition directly determines the interfacial integrity,dynamic Li^(+)/e^(-)transport processes and the subsequent Li+plating/stripping behavior;thus,it is of significance to regulate the interphase to have better safety and higher energy density for all-solid-state lithium metal batteries.Here,by incorporation of Li^+conducting LiTa_(2) PO_(8) fillers in PEO-based polymer electrolyte.
