| With the arrival of the oil-fueled automotive delisting,new energy vehicles have entered the phase of rapid development,as the most popular electric vehicle battery,lithium-ion batteries attract much attention.Compared with the mature and stable commercial graphite anode,for high-capacity,long life,low cost,safety and environmental protection of cathode materials research and development is particularly urgent.Ternary material with high specific capacity,energy density and good security,has become a hot cathode material,but the electrochemical properties of ternary materials,thermal stability,structural stability still need to further improve.Surface coating can effectively improve the performance of ternary materials,and is also one of the main means to improve the performance of ternary materials.The surface coating is usually coated with material particles,which is complicated and expensive to produce,which is not conducive to the industrialization promotion.Many research results are only in the laboratory research stage.So this article by the commercialization of the ternary material preparation of electrodes are subjects,with zinc oxide,oxide graphene and graphite as the cladding material,silk screen printing method is used to analyse the ternary materials electrode surface coating optimization.The specific research contents are as follows:1.Through the investigation and study to determine the maximum thickness of coated,chose the preparation method is simple,low cost,save raw materials and easy industrialized production of silk screen printing as a means of cladding,chose 600 mesh nylon mesh.2.In this paper,zinc oxide,graphene oxide and graphite were used as cladding materials,and the overall coating of the ternary materials electrode was realized by combining the solution with the screen printing method.Zinc oxide particles were prepared by chemical precipitation method with zinc sulfate and ammonium bicarbonate as rawmaterials,and then the aqueous solution of zinc oxide was prepared by using sodium tripolyphosphate as dispersant.Graphite aqueous solution is made from graphite,which is usually used as anode material,and sodium carboxymethyl cellulose is used as dispersant.The aqueous solution of graphene oxide is a mature product purchased with the same concentration as the above two solutions.3.After the characterization of the chemical properties of the ternary materials electrode after coating,the electrode performance of the ternary materials was improved effectively.The cyclic performance of the coated electrode was the best when coated with one layer.Graphite coated electrode has the best multiplier performance,and its comprehensive performance is better.Through X-ray diffraction and scanning electron microscopy,it is concluded that the improvement of the performance is attributed to the interwoven network structure of the ternary material and the coating,which has a higher specific surface area.This structure reduces the active material and electrolyte side effects,formed a more stable solid electrolyte interface membrane,so that the ternary electrode structure more stable,improve the performance and cycle stability.4.This paper makes a comparative study of cladding samples with different thicknesses of the same cladding materials,and the results show that the coating thickness of the coating is the best when coated with zinc oxide coating.It is the best performance for the electrode coated with the coating thickness,while the electrode with the coating thickness is the best.In summary,the method of overall coating on the electrode surface can improve the performance of the ternary materials electrode and provide a simple and effective method for improving the performance of the ternary materials battery. |
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