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release time:2022-11-23 Hits: Popular:AG11 battery
The advantages of ternary lithium battery are: smaller volume, higher capacity density, low temperature resistance, better cycle performance, and it is the mainstream of new energy passenger vehicles. Disadvantages: poor thermal stability, it will decompose at 250-300 ℃, and the chemical reaction of ternary lithium material is particularly strong. Once oxygen molecules are released, the electrolyte will burn rapidly under the action of high temperature, and then deflagration will occur.
The ternary lithium battery is relatively balanced in capacity and safety, and has excellent overall performance. The advantages and disadvantages of these three metal elements are as follows:
Co3+: reduce the mixed occupation of cations, stabilize the layered structure of materials, reduce the resistance value, improve the conductivity and improve the cycle performance and speed. Ni2+: can increase the capacity of materials (increase the energy density of material volume). Since the radii of Li and Ni are similar, excessive Ni will also cause lithium nickel mixed discharge due to the dislocation with Li and the concentration of nickel ions in the lithium layer. The larger the lithium, the more difficult it is to de interlace it in the layered structure, resulting in poor electrochemical performance.
Mn4+: It can not only reduce the cost of materials, but also improve the safety and stability of materials. However, if the content of Mn is too much, it is easy to appear spinel phase, which will destroy the layered structure, thus reducing the cycle capacity and attenuation.
High energy density is the biggest advantage of the ternary lithium battery. The voltage platform is an important indicator of the battery energy density, which determines the basic efficiency and cost of the battery. An time battery with higher voltage platform and ternary lithium ion battery have longer battery life. The discharge voltage platform of a single ternary lithium battery is as high as 3.7V, that of lithium iron phosphate is 3.2V, and that of lithium titanate is only 2.3V. Therefore, from the perspective of energy density, ternary lithium battery is superior to lithium phosphate, and lithium manganate or lithium titanate has absolute advantages.
Poor safety and short cycle life are important shortcomings of ternary lithium batteries, especially their safety performance, which has become an important factor limiting their large-scale implementation and large-scale integration applications. A large number of practical tests show that large capacity ternary batteries are difficult to pass the safety tests such as acupuncture and overload, which is also the reason why large capacity ternary batteries usually introduce more manganese and even use manganate.
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