Preparation And Properties Of Flexible Ternary Layered Lithium-Rich Manganese-Based Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ Cathode Materials

Due to the advancement of science and technology,people’s demand for more compact and lightweight flexible electronic devices is getting higher and higher,so there are more requirements for energy storage devices in flexible electronic devices.First,as the most widely used energy storage device today,lithium-ion batteries also need to meet the characteristics of small size,light weight and flexibility.Second,lithium-ion batteries still need to have good performance to meet the demand on the basis of their flexibility.The layered lithium-rich manganese-based Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ cathode material has the advantages of higher energy density,higher discharge capacity and environment friendly,so it can be used to prepare high-performance flexible electrodes.Its theoretical specific capacity can reach more than250 mAh·g^-1,which is higher than most of the current commercial cathode materials,and can meet our requirements for flexible lithium-ion batteries.In our work,we used Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ to prepare high-performance flexible electrodes,which provided a reference for the practical application of flexible lithium-ion batteries.The main research contents of this paper are as follows:1.The Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ cathode material was prepared by the sol-gel method,and the prepared powdery material had a stable crystal structure.Then use the slurry coating method to prepare a current collector-free Li_1.2Ni_0.13Co_0.13Mn_0.54O₂flexible film with sapphire as the substrate.Through a series of characterization methods,it is concluded that the preparation of flexible electrodes does not change the crystal structure of the material.2.The flexible film was cut into electrodes with a diameter of 12 mm and assembled into a button battery to test the electrochemical performance of the button battery.We found that the initial discharge capacity of the flexible film reached 314.0mAh·g^-1 at a current density of 25 mA·g^-1,and the capacity retention rate of the flexible film was 82.1%after 200 cycles at 500 mA·g^-1,decays by about 0.08%per cycle.Both the rate performance and the cycle performance are better than the samples coated on the Al current collector,indicating that the film has excellent electrochemical performance.3.We bend the flexible film at arbitrary locations to verify its flexibility.The soft-package battery made by the flexible film can still be used in a bent state,and can keep the brightness of the LED lamp unchanged,indicating that the film is expected to be practically applied in flexible batteries.