Solid-state sodium-ion batteries with sodium metal anodes possess high safety and reliability,which are considered as a promising candidate for the next generation of energy storage technology.However,poor electronic ...Solid-state sodium-ion batteries with sodium metal anodes possess high safety and reliability,which are considered as a promising candidate for the next generation of energy storage technology.However,poor electronic and ionic conductivities at the interface between electrodes and solid-state electrolytes restrict its practical application.Herein,we demonstrate a β″-Al_(2)O_(3) electrolyte with a vertically porousdense bilayer structure to solve this problem.The carbon-coated vertically porous layer serves as a high mass-loading host for Na_(3)V_(2)(PO_(4))_(3) cathode and provides fast electronically and ionically conductive pathways.In addition,the dense layer is produced to prevent sodium dendrite growth and improve mechanical strength of β″-Al_(2)O_(3) electrolyte.Experimental results show that the cathode loading in vertically porous layer can reach to 8 mg cm^(-2),and the porous-dense bilayer β″-Al_(2)O_(3) electrolyte-based battery exhibits a reversible specific capacity of 87 mAh g^(-1) and a capacity retention of 95.5%over 100 cycles at a current density of 0.1 C,which is superior to that of the traditional dense β″-Al_(2)O_(3) electrolytebased battery.This work based on electrolyte structure design represents an efficient strategy for the development of solid-state sodium-ion batteries with high mass-loading cathode.展开更多
基金This work was supported by the National Natural Science Foundation of China(NSFC)project No.51672300,opening project of CAS Key Laboratory of Materials for Energy Conversion.
文摘Solid-state sodium-ion batteries with sodium metal anodes possess high safety and reliability,which are considered as a promising candidate for the next generation of energy storage technology.However,poor electronic and ionic conductivities at the interface between electrodes and solid-state electrolytes restrict its practical application.Herein,we demonstrate a β″-Al_(2)O_(3) electrolyte with a vertically porousdense bilayer structure to solve this problem.The carbon-coated vertically porous layer serves as a high mass-loading host for Na_(3)V_(2)(PO_(4))_(3) cathode and provides fast electronically and ionically conductive pathways.In addition,the dense layer is produced to prevent sodium dendrite growth and improve mechanical strength of β″-Al_(2)O_(3) electrolyte.Experimental results show that the cathode loading in vertically porous layer can reach to 8 mg cm^(-2),and the porous-dense bilayer β″-Al_(2)O_(3) electrolyte-based battery exhibits a reversible specific capacity of 87 mAh g^(-1) and a capacity retention of 95.5%over 100 cycles at a current density of 0.1 C,which is superior to that of the traditional dense β″-Al_(2)O_(3) electrolytebased battery.This work based on electrolyte structure design represents an efficient strategy for the development of solid-state sodium-ion batteries with high mass-loading cathode.
