Research On The Influence Of Electrochemical Performance Of Industrial Silicon Anode Metal Air Batter

Compared with other metal air batteries,silicon air batteries have a very high energy density,and as a clean and efficient electrochemical energy conversion device,silicon air batteries have good prospects for future applications.Compared with the anodes of other metal air batteries,silicon is the most abundant in the earth’s crust,accounting for about twenty-six percent of the crustal content.Because silicon is abundant and readily available in the earth’s crust,the production of silicon air batteries is not limited,which offers the possibility of mass production in the future.However,the discharge performance of silicon air batteries is affected by anode passivation and corrosion,and the optimization of silicon anode materials has been a top priority for silicon air batteries in order to improve their long-term discharge capability.In this paper,industrial silicon is used as the anode of silicon air battery,and the anode is melted as a whole to reduce the leakage phenomenon caused by the anode holes.And the relationship between different current densities and the discharge voltage of industrial silicon air cells was found by conducting discharge experiments on industrial silicon air cells with different current densities using concentrations with better discharge voltages.During this period,it was found that the passivation phenomenon of ordinary silicon air cells can be effectively solved when industrial silicon is used as the anode of silicon air cells,and the morphological changes of industrial silicon before and after the reaction also verified this.Combining the polarization test of industrial silicon and the analysis of corrosion performance,the relationship between corrosion of industrial silicon and the electrolyte concentration and discharge current density was derived,and the electrochemical performance of silicon air batteries was further investigated when industrial silicon was used as the anode,the discharge potential can reach more than 1.1V,and it was found that industrial silicon as the metal anode of silicon air batteries could effectively solve the problem of passivation of silicon air batteries.A comparative study of the electrochemical impedance and polarization of industrial silicon and other types(n-type,p-type)of doped silicon shows that the impedance of industrial silicon is lower than that of other doped silicon,while the corrosion rate and corrosion current density are higher than those of several types of doped silicon due to the repeated breakdown of the passivation film by other metallic elements(Fe,Al,Ca)in industrial silicon,but compared with the corrosion rate,the sustained stable discharge is more important than the corrosion rate.Considering that the surface morphology also affects the performance of the industrial silicon air cell,the industrial silicon was used as anode after polishing with different grades of metallographic specimen polishing machine,and the electrochemical performance of the industrial silicon anode was compared with that of the industrial silicon anode after polishing with different grades.The corrosion current and corrosion rate were almost two orders of magnitude smaller than those of unpolished silicon,180 mesh has the best effect.