Finite Element Simulation Of Microwave Heating Of LiNi 1/3 Co 1/3 Mn 1/3 O 2

At present,the power of lithium-ion battery as one of the main force for the development of new energy,with unparalleled prospects for development.And Lithium-ion battery cathode material,which determines the performance of the battery has become the focus of the relevant areas of research.This paper is mainly for the microwave preparation of lithium-ion battery cathode material simulation research.Firstly,COMSOL-Multiphysics was used to analyze the distribution of’electromagnetic fields in microwave ovens.Then,the change of electromagnetic field and temperature field after LiNi1/3Co1/3Mn1/3O2 was studied.The micro sphere model was established for the solid powder LiNi1/3Co1/3Mn1/3O2.And the distribution of the electromagnetic field between the spheres with the same properties of LiNi1/3Co1/3Mn1/3O2 was studied.Finally,the relative permittivity of LiNi1/3Co1/3Mn1/3O2 was compared with the results of simulation and experiment.Firstly,the geometrical model of rectangular resonator and cylindrical resonator was established by using COMSOL-Multiphysics,and the distribution of electromagnetic field in microwave oven was studied.It is found that the distribution of the electromagnetic field is not uniform in the multimode rectangular resonator,and the position of the maximum electric field is located at the center of the resonator.The position of the maximum magnetic field is not at the center of the resonator.In the multimode cylindrical resonator,the distribution of the electromagnetic field is not uniform,like the petals in the resonant cavity.And the energy distribution of the cylindrical resonator in the laboratory was verified by the thermal paper method.As a result,there was a discrepancy between the simulation and the experimental results.But the resonant cavity center of the electromagnetic field distribution evenly,the following studies can be conducted.Then,the change of electromagnetic field and the temperature rise curve were studied after the LiNi1/3Co1/3Mn1/3O2 was placed in the model of the resonator.The spherical model was established for the solid powder LiNi1/3Co1/3Mn1/3O2 to study the change of the electromagnetic field,.It is found that the field strength of the electromagnetic field decreases obviously when LiNi1/3Co1/3Mn1/3O2 in the multimode rectangular resonator and the multimode cylindrical resonator.And it is preferentially heated at the position away from the feed,the heating rate of the material increases with the temperature increasing.In the established spherical model,it was found that the distribution of electromagnetic fields around LiNi1/3Co1/3Mn1/3O2 was larger and the internal distribution of the pellets was smaller.Finally,the variation law of the relative permittivity of LiNi1/3Co1/3Mn1/3O2 was studied.It is found that the relative permittivity of LiNi1/3Co1/3Mn1/3O2 is below 720℃increases with the increase of temperature.The simulation is in accordance with the experimental results.In addition,a new type of microwave resonator is designed for the advantages and disadvantages of rectangular resonator and cylindrical resonator in the simulation process.