Ternary lithium battery and lithium iron phosphate battery which is durable?

With the popularity of electric vehicles, batteries as a core component, their performance and durability have become the focus of attention of consumers and manufacturers. In the market, ternary lithium batteries and lithium iron phosphate batteries are the two mainstream lithium battery types, which differ in terms of durability, safety and cost. This paper will compare and analyze the durability of ternary lithium battery and lithium iron phosphate battery in detail.

1.The basic structure of ternary lithium battery and lithium iron phosphate battery

① Ternary lithium battery is mainly composed of nickel, diamond, manganese three metal elements of the positive electrode material, the negative electrode is usually graphite. The electrolyte is usually LiPF.

② The positive electrode material of the lithium iron phosphate battery is lithium iron phosphate, the negative electrode material is graphite or lithium acid, and the electrolyte is LiPF.

2. Definition and evaluation method of durability

Durability refers to the service life of the battery under certain conditions. This includes the number times of charge and discharge cycles, capacity retention rate, self-discharge rate and other indicators. To evaluate the durability of the battery, it is generally necessary to measure the capacity change and internal resistance change of the battery by simulating the charge and discharge cycle under different use conditions.

3. Ternary lithium battery durability analysis

① Ternary lithium battery charge and discharge performance is better, can achieve high energy density and power density. This means that under the same weight, the ternary lithium battery can store more electricity, which provides a longer range for electric vehicles.

② Ternary lithium battery cycle life is long, generally about 1500 to 3000 times, charge and discharge efficiency is high. This means that under normal conditions of use, the ternary lithium battery can support a longer mileage of electric vehicles.

③Ternary lithium battery shows good stability in high temperature environment, but there are high temperature safety problems. In a high temperature environment, the positive electrode material structure of ternary lithium batteries may change, resulting in reduced battery performance or failure.

4. Durability analysis of lithium iron phosphate batteries

①The lithium iron phosphate battery has high safety and stability, the positive electrode material does not contain precious metals such as diamonds, and the cost is low. Because it does not contain precious metals, the production cost of lithium iron phosphate is relatively low, so it has a certain advantage in price.

② Lithium iron phosphate battery cycle life is long, generally up to 2000-3000 times, and even in some environments can be more than 4000 times. During the charge and discharge process, the structure of the lithium iron phosphate battery is relatively stable, so it can support a long service life.

③ Lithium iron phosphate battery performance is stable in high temperature environment. Because the cathode material does not contain precious metals, the safety of the battery is high. At the same time, lithium iron phosphate batteries show good stability in high temperature environments, and will not cause battery performance to decline or fail due to high temperature.

5. Durability comparison summary

In summary, ternary lithium batteries and lithium iron phosphate batteries have their own advantages in terms of durability. Ternary lithium battery has higher energy density and power density, better charging and discharging performance, and shows better stability in some environments. The lithium iron phosphate battery has high safety and stability, the cathode material cost is low, the cycle life is long, and the performance is stable in high temperature environment.

6. Other factors affecting durability

In addition to the type of battery, there are other factors that can affect the durability of a battery. For example, the performance and maintenance of the battery management system, charging conditions, and the use environment will affect the service life of the battery. Therefore, in the process of use, the correct charging method, regular maintenance and management of the battery and other measures are also very important to extend the service life of the battery.

conclusion

When choosing an electric vehicle, battery durability is one of the important considerations. By comparing and analyzing the durability characteristics of ternary lithium battery and lithium iron phosphate battery, it can be seen that ternary lithium battery has better charging and discharging performance and higher energy density; The lithium iron phosphate battery has high safety and stability and long cycle life. In addition, regular maintenance and management of the battery and other measures are also very important to extend the service life of the battery. Therefore, when choosing electric vehicles, consumers need to choose the appropriate battery type and management and maintenance mode according to their own use needs and environmental conditions to ensure the service life and performance of the battery.