The Comparation Of Lithium Iron Phosphate Battery And NCM Lithium Ion Battery

The lithium iron phosphate battery refers to a lithium ion battery using lithium iron phosphate as a positive electrode material. The positive electrode materials of lithium ion batteries mainly include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate and the like. Lithium iron phosphate batteries are characterized by high safety, high rate charge and discharge characteristics and long cycle life. In addition to long life and excellent charge and discharge performance, the biggest advantage of lithium iron phosphate battery is its safety. The chemical properties of lithium iron phosphate are stable, and the high temperature stability is good. It will start to decompose at 700-800 °C. In the case of impact, acupuncture, short circuit, etc., no oxygen molecules are released, no violent combustion occurs, and safety performance is high.

The disadvantage of lithium iron phosphate battery is that its performance is greatly affected by temperature, especially in low temperature environment, the discharge capacity and capacity are greatly reduced. In addition, lithium iron phosphate has a lower energy density, and only the weight energy density of the battery is only 120 Wh/kg. If the entire stack is calculated, the energy density of the components including the battery management system and heat dissipation is lower.

NCM lithium ion battery:

The lithium ion battery: is referred to as "a lithium ion secondary battery using a ternary polymer such as lithium nickel cobalt manganese oxide or nickel cobalt aluminum aluminate as a positive electrode material". Since ternary lithium batteries are currently widely used in new energy vehicles, such as our well-known Tesla, all models use ternary lithium batteries. The ternary lithium battery is the mainstream of new energy passenger cars because of its smaller size, higher capacity density, low temperature resistance and better cycle performance. The life span is 2000 charge and discharge cycles. We count as one charge per day and can last for more than 5 years.

The safety of the ternary lithium battery is poor. The ternary lithium battery has poor thermal stability, and will decompose at 250-300 ° C. After encountering the flammable electrolyte and carbon material in the battery, the generated heat further aggravates the decomposition of the positive electrode, and in a very short time Will deflagrate. Therefore, for a ternary lithium battery, its battery management system and heat dissipation system are crucial.