In nature, lithium is a light metal with a small atomic weight of 6.94g/mol, ρ= 0.53g/cm3。 Lithium has active chemical properties and is easy to lose electrons and be oxidized to Li+. Therefore, the standard electrode potential * is negative, - 3.045V, and the electrochemical equivalent * is small, 0.26g/Ah. These characteristics of lithium determine that it is a material with high specific energy. Ternary lithium battery refers to a lithium secondary battery using three transition metal oxides of nickel, cobalt and manganese as cathode materials. It fully integrates the good cycle performance of lithium cobalate, the high specific capacity of lithium nickalate, the high safety and low cost of lithium manganate and other characteristics, and uses molecular level mixing, doping, coating and surface modification methods to synthesize nickel, cobalt, manganese and other multi-element synergistic composite lithium oxide. It is a kind of lithium ion rechargeable battery that has been widely studied and applied.

　　Materials with balanced capacity and safety have better cycling performance than normal lithium cobalate. In the early stage, due to technical reasons, the nominal voltage was only 3.5-3.6V, which is limited in the scope of use. However, as the formula continues to improve and the structure is improved, the nominal voltage of the battery has reached 3.7V, which has reached or exceeded the lithium cobalate battery level in capacity.

　　1. The voltage platform is high. The voltage platform is an important indicator of battery energy density, which determines the basic efficiency and cost of the battery. Therefore, the selection of battery materials is of great significance. The higher the voltage platform is, the greater the specific capacity is. It is certain that batteries with the same volume, weight and even the same ampere hour will have a longer range of life. The voltage platform of the ternary material is significantly higher than that of lithium iron phosphate. The high wire can reach 4.2 volts, and the discharge platform can reach 3.6 or 3.7 volts.

　　2. High energy density

　　3. High vibrating density

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