In the past 30 years, the invention of lithium-ion batteries has caused a revolutionary development in portable electronic devices. Compared with traditional disposable dry batteries, nickel-metal hydride batteries, lead-acid batteries, etc., lithium-ion batteries have the advantage of high energy density. Therefore, it is necessary to sort out the development direction of lithium-ion battery cathode materials.

　　As an energy storage device, the ultimate function of lithium batteries is to provide electrical energy to related equipment. Therefore, cost and energy density are the two most important factors.

　　From the perspective of application fields, small batteries used in portable electronic devices still need to further improve energy density and lifespan. However, this is not as urgent as the field of electric vehicles.

　　In order to greatly increase the energy density of the material battery, high nickel material (NCM811) is a good direction, because it has a higher working voltage, thereby increasing the energy density of the material.

　　Due to the uneven distribution of cobalt reserves and the high price, the cobalt-free electrode material is also an important electrode material in the future.

　　If safety performance is taken into consideration, the polyanionic compound LiFePO4 - lithium iron phosphate battery, is also a popular choice of cathode material. Due to its excellent thermal stability, it can ensure the safety of use.

　　The development of higher working voltage polyanionic cathode materials is also one of the future development directions, including the use of vanadium and doping with fluorine.

　　At present, there is no lithium battery that can fully meet the use needs of all scenarios, and different cathode materials can only be selected according to various needs.

　　Judging from the development trend in recent years, the combination of theoretical research, design and synthesis of cathode materials with high energy density and good safety performance is still considered to be the main theme of the development and research of cathode materials.