Electrochemical Performance Analysis And Preparation Of Electrode Materials For Lithium Ion Capacitor Battery

With the improvement of technology and innovation capabilities,developing the green and clean energy has become a trend of today's society.Nowadays,the growth of a new generation of clean and green energy such as electric vehicles has become a hot spot.In recent years,as a new type of energy storage system,lithium ion capacitor battery can both have the advantages of a lithium ion battery and a super capacitor.It mainly uses a pulse current?especially a large current?to charge and discharge the battery,which not only can instantly restore the battery performance,but also can achieve the characteristics of instant charge and discharge.This paper mainly explores the preparation of positive and negative materials for lithium ion capacitor battery and their applications in the lithium ion capacitor battery.Firstly,both electrodes are assembled with a lithium metal sheet into a half battery.Secondly,the best ratio was found and then assembled into a full battery for electrochemical test analysis.First,the anode material is prepared by mixing lithium titanate and activated carbon in different proportions,and coating the copper foil on one side to form a composite electrode material.The material has uniform particle size distribution and no obvious agglomeration,then has a large specific surface area and porosity.When the mass ratio of lithium titanate to activated carbon is 7:3,the battery can be stably cycled for about 4000 times at a current density of 1.0 A/g,and the first discharge capacity can reach 118.5 mAh/g.The ternary positive electrode Li_0.24Ni_0.64Al_0.64Mn_0.56O₂?NAM? and the multi-metal oxide Ni_0.8Al_0.48Mn_0.62O₂ were prepared by coprecipitation method.XRD?CV?AC impedance,charge and discharge test and other analysis may show that the ternary material with Li⁺has better performance.Then NAM was mixed with a commercial lithium ion battery ternary material LiNi_1/3Co_1/3Mn_1/3O₂?NCM? in different mass ratios,coated on aluminum foil surface and form a composite electrode material.The lithium ion half-cell assembled with this material?NCM and NAM mass ratio of 7:3? has a specific capacity of 196.3 mAh/g?120.7 mAh/g?97.5 mAh/g and 67.6 mAh/g at current densities of 0.5 C?1 C?2 C and 5 C respectively.In addition,the battery can be stably cycled more than 50 times at a high current density of 5 C.Finally,the lithium titanate/activated carbon?7:3? composite material was used as the negative electrode,and the NCM/NAM?7:3? composite material was used as the positive electrode,besides assembled into a full battery for charge and discharge test.The constant current charge and discharge test results show that the lithium ion capacitor battery can stably cycle 1600 times?1000 times and 500 times at current densities of 0.5 C?2 C and 5 C,and the capacity retention rate of the battery is above 72.4%.