Research On The Design Of Metal Lithium Electrolytic Cell Of Battery Grade

At present,the equipment for preparing lithium metal in industry is mainly an electrolytic cell.The existing industrial electrolytic cell has high energy consumption and current efficiency of about 80%.Most of the lithium metal produced by electrolysis is scooped out manually.The working environment of workers is poor,and the metal is easy to be oxidized,resulting in the low purity of lithium metal.The areas with high purity requirements for lithium metal need further purification.In view of this situation,it is necessary to design an electrolytic cell with high current efficiency,safe and easy operation and high purity of lithium metal to solve the above problems.Through the study of the existing electrolyzer structure and lithium electrolysis principle,the basic structure of the electrolyzer is designed,and the main structure of the electrolyzer is optimized by the simulation software.The specific contents are as follows:(1)According to the principle of lithium metal electrolysis,the structural design of the cell body is determined,the initial structure of the electrolytic cell is determined,the basic parameters of the electrolytic cell structure such as the cathode and the anode are calculated,and the components of the electrolytic cell are three-dimensionally modeled and assembled using three-dimensional software.(2)Determine the fluid parameters and initial conditions required for the three-dimensional flow field simulation calculation of the electrolytic cell,and establish a three-dimensional flow field model of molten salt electrolyte.The three-dimensional flow field of molten salt electrolyte is simulated and analyzed by using the multi-physical fields simulation software.The movement of anode gas and cathode metal in the electrolyte is studied and the distribution of metal and gas is analyzed.And the analysis of metal and gas distribution and molten salt flow trend is analyzed;the three-dimensional flow field of different cathode diameter and electrode insertion depth of the electrolyzer was simulated and analyzed to determine the cathode diameter and electrode insertion depth.(3)By studying the calculation method of thermal balance of lithium metal electrolyzer,determine the heat generated by the electrolytic cell and the heat dissipated and the boundary conditions of the molten salt electrolyte,,a three-dimensional thermal field simulation model of the electrolyzer is established,using multi-physical fields simulation software to simulate the thermal field of molten salt electrolyte.The results show that the high temperature area of the electrolyzer is between the anode and the cathode,and the anode surface temperature ishigher than that of the anode on the surface of cathode,the temperature gradually decreases from the inside out,the lower the temperature around the cell is;the thermal field of lithium metal cell under different voltage and different external auxiliary heat temperature is simulated and analyzed to determine the electrolytic parameters when the cell is working.(4)The main parts and components of the lithium metal electrolyzer are designed and manufactured,the heating mode and thermal insulation materials are analyzed and selected,Finally,the assembly of the lithium electrolysis cell was completed.(5)The electrolysis experiment of lithium metal electrolyzer was carried out,determine the experimental plan,introduce the equipment and precautions required for the experiment,the experimental preparation and process,analyze the experimental results and problems encountered,find out the deficiencies in the device,confirm the feasibility of the electrolytic cell and the correctness of the simulation results.A kind of high purity lithium metal electrolytic equipment is proposed in this research.The structural parameters of the main parts of the electrolytic cell and the electrolytic parameters of the electrolytic cell are optimized by the simulation software.On the optimized structure,the whole electrolytic cell is designed,and then the designed electrolytic device is manufactured and installed.Finally,the electrolytic lithium experiment is carried out,providing the basis for the high current battery level lithium metal electrolytic cell design.