High Temperature Molten Salt Metal Air Batteries And The Electrolyte And Electrode Materials

For the problem of energy shortages and environmental pollution,finding clean renewable energy has become one of the hotspots of scientific research now.Recently,clean energy represented by solar/wind energy has been promoted in many regions.Compared with traditional thermal power generation,solar/wind energy has great advantages.However,the problem of intermittent,volatility and frequency modulation and peak shaving of solar/wind energy is still difficult to solve.In order to integrate solar/wind energy into the power grid,it is significant to study energy storage battery technology that can be used for large-scale power storage.Common energy storage technologies include mechanical energy storage,thermal energy storage,electrical energy storage,chemical energy storage and electrochemical energy storage.Among them,electrochemical energy storage technology has been widely concerned in recent years.Metal-air batteries have broad application in electric vehicles,portable power supplies and large-scale energy storage because of their high energy density,simple battery structure,and low cost.It has become an important direction for developing clean energy and sustainable development.However,metal air batteries have the problem of being difficult to seal,electrolyte instability and electrode passivation,which limited the promotion of this battery.Our research attempts to solve the problem of battery seal and electrode instability by using high-temperature molten salt as the electrolyte of Metal air battery from the the aspects of battery device design and processing.It could be divided into two aspects including electrolyte structure innovation and electrode material processing and manufacturing.In details,the solid electrolyte with the function of conducting ions and insulating molten salts was added,and the high-temperature conductive ceramic electrode formed by gel casting method was mainly studied.The research contents are as follows:(1)The high temperature molten salt and solid oxide electrolyte were used as the electrolyte of the iron-air battery,and the battery assembly,mechanism and cycle performance of the iron-air battery with molten lithium carbonate and YSZ dual-phase electrolyte were studied.The electrochemical reaction mechanism is studied by XRD,XANES,Mossbauer spectrum and cyclic voltammetry(CV).The mode of constant current charging and discharging or constant current charging and constant power discharge are utilized to study the energy density,power density and cycle stability of the battery.(2)Agar was used as binder of gel casting to fabricate LSM sintered body.We studied the effects of agar concentration and sintering temperature on the preparation of LSM body.The sintered body was characterized by XRD,SEM,TEM,BET,mercury injection et al to research its microstructure.