In-situ Transmission Electron Microscopy Study On The Application Of Sb₂S₃ And Sb₂Se₃ Materials In Potassium Ion Batteries

Potassium ion battery is a new type of energy storage device.Compared with lithium ion batteries,potassium ion batteries have many advantages,such as abundant resources and low electrode potential.Because potassium,sodium,and lithium are in the same main group,the working mechanism of batteries is very similar.They all rely on the movement of ions between the positive electrode and the negative electrode.In this paper,Sb₂S₃ and Sb₂Se₃ nanowires are used as anode materials for potassium ion batteries.In the transmission electron microscope,nanowires are used as working electrodes to build a potassium ion battery.Microscopic changes in morphology,structure,composition,reveal the energy storage mechanism of nanomaterials in potassium batteries,explain the failure mechanism of materials during energy storage,and provide microscopic theory for finding suitable nanoelectrode materials or modifying nanomaterials in accordance with.In the transmission electron microscope,Sb₂S₃ nanowires were used as the anode material,metallic potassium as the cathode material,and potassium oxide as the electrolyte.The potassium ion nanobattery device was built in the transmission electron microscope,and the electrochemistry of the Sb₂S₃ nanowires was observed in situ by means of applied voltage.In the process of potassium insertion/depotassium,the nanowires have obvious elongation,bending,and volume expansion during potassium insertion,which explains the low efficiency of the first cycle and the rapid capacity decay in the macro battery performance.The electrode material occurs The conversion reaction produces K_xSb₂S₃,and the volume cannot be restored to the initial state during the depot removal process.The reason remains to be studied.Then use Sb₂S₃ nanowires as the negative electrode material,and metal potassium as the positive electrode material to make button batteries,and test the performance of the button batteries such as rate and life.In the transmission electron microscope,Sb₂Se₃ nanowires were used as anode materials,metallic potassium was used as cathode materials,and potassium oxide was used as electrolytes.A nano-ion battery was constructed.The electrochemical potassium insertion/desorption of Sb₂Se₃ nanowires was observed in situ in real time by means of applied voltage.In the potassium process,the nanowires showed obvious elongation,expansion,and bending during the potassium insertion process,which explained the low efficiency of the first cycle and the rapid capacity decay in the performance of the macro battery.The electrode material also produced a conversion reaction.For K_XSb₂Se₃,the volume cannot be restored to the initial state during the de-potassium process,the reason remains to be studied.Using Sb₂Se₃ nanowires as the anode material and metallic potassium as the anode material to make button batteries,test the rate and life of button batteries.