With the popularity of electric vehicles, lithium batteries, as core components, have become the focus of consumers and manufacturers in terms of their performance and durability. In the market, nmc battery and lifepo4 battery are two mainstream lithium battery types, which differ in durability, safety and cost. This article will conduct a detailed comparative analysis of the durability of nmc battery and lifepo4 battery.

1. The basic structure of nmc battery and lifepo4 battery

① NMC battery mainly consists of positive electrode materials composed of nickel, diamond and three metal elements. The negative electrode is usually graphite. The electrolyte generally uses lithium hexafluorophosphate.

②The positive electrode material of lifepo4 battery is lithium iron phosphate, the negative electrode material is graphite or lithium borate, and the electrolyte is lithium hexafluorophosphate.

2. Durability definition and evaluation method

Durability refers to the lifespan of a battery under specific conditions. This includes indicators such as the number of charge and discharge cycles, capacity retention rate, and self-discharge rate. To evaluate the durability of a battery, it is generally done by simulating charge and discharge cycles under different usage conditions and measuring parameters such as changes in battery capacity and internal resistance.

3. Durability analysis of nmc battery

① NMC battery has better charge and discharge performance and can achieve higher energy density and power density. This means that under the same weight, the NMC battery can store more electrical energy, thereby providing longer driving range for electric vehicles.

② The cycle life of the nmc battery is longer, generally around 1,500 to 3,000 times, and the charge and discharge efficiency is high. This means that under normal use conditions, NMC battery can support electric vehicles driving longer mileage.

③ NMC battery shows good stability in high temperature environment, but there are high temperature safety issues. In a high-temperature environment, the structure of the positive electrode material of the NMC battery may change, resulting in battery performance degradation or failure.

4. Durability analysis of lifepo4 battery

① Lifepo4 battery has high safety and stability. The positive electrode material does not contain precious metals such as diamond, and the cost is low. Since it does not contain precious metals, the production cost of lifepo4 battery is relatively low, so it has certain advantages in price.

② The lifepo4 battery has a long cycle life, generally up to 2000-3000 times, and even more than 4000 times in some environments. During the charging and discharging process, the structure of lifepo4 battery is relatively stable, so it can support a long service life.

③ Lifepo4 battery has stable performance in high temperature environments. Since the positive electrode material does not contain precious metals, the battery is safer. At the same time, lifepo4 battery shows good stability in high temperature environments and will not cause battery performance degradation or failure due to excessive temperature.