Preparation And Performance Of 3D Printing Microbattery

Lithium-ion battery is a new type of protection nergy source,compared with other rechargeable batteries,this battery has great advantages,such as high voltage,high specific energy,long charge and discharge life,no memory effect,less environmental pollution,rapid Charging and other advantages.However,With the rapid development of MEMS at home and abroad,the requirements for miniaturization and integration of energy devices are becoming higher and higher.Among them,the design and preparation of three-dimensional miniature lithium-ion batteries has become a research hotspot of many scholars.The three-dimensional lithium battery can effectively improve its energy density and make full use of space to reduce the migration distance between ions.3D printing technology(additive manufacturing technology)is the forefront of manufacturing technology at present.The application of this technology in the 3D structure design of miniature lithium ion battery has become a research hotspot in many universities and research institutes.In this paper,3D printing technology is used to prepare 3D lithium ion battery,which can effectively improve the battery space utilization and energy density parameters.The main research in this paper is to determine the ink components and proportion of the positive and negative electrode,the design of three-dimensional lithium ion structure and the optimization of process parameters in the printing process and the electrochemical test after printing electrodes.The main findings are as follows:(1)Determining the thickener for hydroxyethyl with hydroxypropyl cellulose(mass ratio of 1:1)mix,and the composition and ratio of the positive and negative printing inks are selected and determined,so that the two printing inks have good fluidity,showing rheological properties,can print complete electrode and uniform thickness,not appearing accumulation or collapsing phenomenon,At this time,the printing effect is better,the electrode resistivity after printing is the smallest,and it has good electrical conductivity.(2)This essay further analyzes the problems in the process of 3D printing like various printing parameter settings.Setting parameters such as X/Y/Z axis air movement speed,early glue discharge and time delay rubber off.According to the orthogonal experimental analysis of three important parameters,it can be seen that when the printing height is 60.03 mm,the printing speed is 15mm/s,and the pressure value is 0.6 Mpa,the positive electrode ink electrode has the best forming effect,and there is no accumulation orbreaking phenomenon.Secondly,the FLUENT software is used to simulate the velocity distribution of the printing ink when it is pressed in the extrusion cylinder.(3)The preparation process of positive and negative electrode ink was determined,and the best printing process parameter setting was adopted to complete the preparation of positive and negative electrode printing.XRD and electrochemical measurements were carried out on the printed positive and negative electrodes.It was found that the crystal structure of the positive and negative active materials was not changed during the printing process,and the optimum sintering temperature of the positive and negative electrodes was determined to ensure the minimum resistivity.thus good electrical conductivity.The experiment showed that the first specific capacity of the lithium titanate doped with 10%graphite was increased by 18.3%.After 10 cycles,the specific capacity of the lithium titanate electrode can still be maintained at 94.7%.Graphite-doped lithium titanate only has a certain influence on the diffraction peak intensity of the electrode,but does not change the crystal structure of the lithium titanate component in the electrode.