The lifespan of ternary lithium batteries depends on the aging and degradation of battery materials. If the side reactions of lithium-ion batteries can be reduced to a low level so that lithium ions can still flow smoothly between the positive and negative electrode materials through the electrolyte, the lifespan of the lithium-ion battery can be increased. .
The lithium ions passing from the positive electrode to the negative electrode must pass through the SEI film covering the negative carbon electrode. SEI film quality directly affects battery life. Foreign researchers have studied the aging degradation of battery materials relatively early, especially the research on SEI films has been relatively in-depth.
The process of charge and discharge cycles of lithium-ion batteries is the process of deintercalation and displacingcementing lithium ions between the positive and negative electrode materials through the electrolyte. During the cycling process of lithium-ion batteries, redox reactions occur at the positive and negative electrodes.
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There are many types of cathode materials for lithium-ion batteries, including lithium cobalt oxide, lithium manganate lithium, lithium nickel oxide and ternary materials, lithium iron phosphate, etc.
The battery with lithium iron phosphate as cathode material has a long charge and discharge cycle life, but its disadvantages are that there are large deviations in density energy, high and low temperature performance and charge and discharge rate. Features and production cost is high. Lithium iron battery technology and applications have encountered bottlenecksement in development; Lithium manganate batteries have low energy density and poor cycle stability and storage performance at high temperatures. Therefore, lithium manganate is only used as a cathode. material for the first generation of international power lithium batteries.
Many materials are receiving increasing attention and recognition by the industry due to their dual advantages in overall performance and cost, and are gradually surpassing iron phosphate and lithium and lithium manganate to become the dominant technological pathway. Ordinary material batteries have replaced the widely used lithium cobalt oxide batteries and are widely used in the field of laptop batteries.
A relatively balanced material in terms of capacity and safety, and offering better cycle performance thannormal lithium cobalt oxide. At the beginning, for technical reasons, its rated voltage was only 3.5-3.6 V, and its usage range was limited. With the continuous improvement of the formula and the improvement of the structure, the rated voltage of the battery has reached 3.7V and the capacity has reached or exceeded the level of lithium cobalt oxide batteries.
Baidu Encyclopedia-Ternary lithium battery