Home > News > Small: Based on ion / electron mixed conduction Fe3S4@S@0.9Na3SbS4 ⋅ 0.1 Nai composite high performance room temperature all solid state sodium sulfur battery

Small: Based on ion / electron mixed conduction Fe3S4@S@0.9Na3SbS4 ⋅ 0.1 Nai composite high performance room temperature all solid state sodium sulfur battery

wallpapers News 2020-09-11
The excellent safety low cost of

all solid state sodium battery make it possible to be used in large-scale energy storage system. As an important part of all solid state sodium battery the performance of solid electrolyte plays an important role in the electrochemical performance of all solid state sodium battery. Liquid phase method is a common method to prepare nano scale electrolyte. Nano scale electrolyte can enhance the interface contact in the positive layer the physical contact between the positive layer the electrolyte layer. However the ionic conductivity of na3sbs4 electrolyte prepared by liquid phase method is 0.1 ~ 0.3 mscm-1 which is one order of magnitude lower than that of na3sbs4 electrolyte prepared by melt quenching method. The addition of halide can effectively improve the conductivity of solid electrolyte. However the preparation of halide doped electrolyte still involves high-temperature annealing process. Meanwhile some active substances decompose at high temperature the side reaction between electrolyte active substance will occur which limits the in-situ synthesis of electrolyte / active substance composites. Among the active materials with high theoretical specific capacity elemental sulfur has attracted extensive attention due to its abundant reserves low cost but its high insulation also limits its electrochemical performance. Therefore in order to obtain high performance all solid state sodium sulfur battery it is necessary to build a close electron / ion conductive network in the sulfur cathode to improve the three-phase contact point of electrochemical reaction. However the low sublimation temperature of elemental sulfur limits the high-temperature synthesis of electrolyte / elemental sulfur complex. In view of the above problems researcher Yao Xiayin of Ningbo Institute of materials technology engineering Chinese Academy of Sciences research group of Professor Yu Yan of University of science technology of China conducted in-depth discussion on the preparation of sodium sulfide solid electrolyte at room temperature obtained high-performance ion / electron conductive composite sulfur cathode material at lower temperature.

were synthesized in situ by wet mechanical chemical ball milling without annealing Fe3S4@S@0.9Na3SbS4 ⋅ 0.1 Nai ion / electron conductive composite sulfur cathode material. After ball milling 0.9na3sbs4 ⋅ 0.1nai electrolyte with room temperature ionic conductivity of 3.61 ′ 10-4 scm-1 was uniformly distributed in the composite which was conducive to the rapid transport of ions in sulfur cathode. Furthermore by adding fe3s4 the obtained Fe3S4@S@0.9Na3SbS4 The ionic conductivity of ⋅ 0.1 Nai complex is nearly doubled the electronic conductivity ratio is higher than that of ⋅ 0.1 Nai complex S@0.9Na3SbS4 ⋅ 0.1 Nai composite material can improve the electrochemical reaction kinetics of elemental sulfur without sacrificing the mass energy density of battery. The volume of nano-3fes4 can also accommodate the expansion process. Finally the room temperature all solid-state sodium sulfur battery based on the composite shows excellent cycle stability rate performance. After 50 cycles at 500 mag-1 current density the reversible discharge capacity is 410 MAH g-1; the reversible discharge capacity is 952.4 796.7 513.7 445.6 MAH g-1 at 50 100 200 500 mag-1 current density respectively. In order to investigate the effect of fe3s4 on the electrochemical reaction kinetics of elemental sulfur the effect of fe3s4 on the electrochemical reaction kinetics of elemental sulfur was investigated at low current density (100 mag-1) Fe3S4@S@0.9Na3SbS4 ⋅ 0.1 Nai complex its application S@0.9Na3SbS4 The capacity of elemental sulfur in 0.1 Nai was discussed the results showed that the optimized method was feasible Fe3S4@S@0.9Na3SbS4 The capacity of elemental sulfur in ⋅ 0.1 Nai complex is 1040.5 MAH G-1 which is the content of fe3s4 S@0.9Na3SbS4 ⋅ the capacity of elemental sulfur in 0.1 Nai complex is more than three times of (346.6 MAH g-1). This work provides an effective feasible way for the construction of high performance room temperature sodium sulfur battery through reasonable cathode design.


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