The ternary lithium battery has a relatively balanced material in terms of capacity and safety, and its cycle performance is better than normal lithium cobalt oxide. The nominal voltage of the ternary lithium battery is only 3.5-3.6V due to technical reasons in the early stage, which is limited in the scope of use. With continuous improvement and perfect structure, the nominal voltage of the battery has reached 3.7V, and the capacity has reached or exceeded the level of lithium cobalt oxide batteries.
The "ternary" of the ternary lithium battery refers to a polymer containing three metal elements of nickel, Ni, cobalt, manganese or aluminum, which is used as the positive electrode in the ternary lithium battery. The three are indispensable, each of which plays an important role, and the characteristics of each element also restrict battery performance.
From the structural point of view, the ternary lithium battery has high energy density and high charge and discharge efficiency. At the same time, it is not resistant to high temperatures. Therefore, poor safety and short cycle life are the main shortcomings of ternary lithium batteries, especially the safety performance, which has always restricted its large-scale matching and large-scale integrated applications. A major factor. A large number of actual tests have shown that it is difficult for ternary batteries with larger capacity to pass safety tests such as acupuncture and overcharge. This is the reason why more manganese elements are generally introduced in large-capacity batteries, or even mixed with lithium manganate.
From the perspective of usage, generally speaking, ternary lithium batteries are suitable for scenarios that require high energy density, limited space, and high customer experience requirements, such as mid-to-high-end passenger cars.