With the development of consumer electronics products such as mobile phones and laptops, the market demand for lithium-ion batteries is increasing. At the same time, the development of electric vehicles and other energy storage areas put forward higher requirements for the lithium-ion battery energy density and other properties. In the composition of the entire lithium-ion battery, the current cathode material capacity is much lower than the anode material, thus restricting the overall energy density of the battery.Performance, price and safety are the focus of the cathode material. Advanced lithium battery cathode material need to provide high energy density, safety and excellent cycle life.For now, the direction of development of Lithium-ion battery is: high capacity and high operating voltage.Lithium-ion battery mechanism research is also particularly important, such as the interface between the electrode and electrolyte reaction, the structure of the positive phase transformation mechanism and so on. With the help of in-situ instrument test characterization and theoretical calculation, to explore the corresponding reaction mechanism, you can further understand the lithium-ion battery system,which can provide theoretical support to improve the performance of lithium-ion battery.Our task force is dedicated to optimizing the preparation process of the cathode material and improving the electrochemical properties of the material. At the same time, Raman, XRD, TEM and other instruments are used to characterize the mechanism of lithium battery research to promote the development of lithium battery system.