The effect of lithium battery preload on battery life is as follows:
1. Accumulation to a certain extent will lead to particle breakage or lithium plating, reducing the usable capacity and lifespan of the battery cell by 1 to 2 years.
2. The magnitude of the applied preload has a significant impact on battery performance. When the preload is less than 4 MPa, the three-phase interface becomes more uniform and the reaction is more complete as the preload increases, resulting in better battery performance. When the preload is greater than 4 MPa, the amount of electrolyte in the battery decreases as the preload increases, the porosity of the positive electrode decreases, and the space used to store the reaction product potassium peroxide also decreases. The area of the battery CV curve gradually decreases, the battery capacity gradually decreases, the resistance increases, the diffusion becomes worse, the battery discharge capacity gradually decreases, and the number of reaction cycles also decreases.
