Aging generally refers to the placement of the battery after the first charging after the assembly of the battery is completed. There can be aging at normal temperatures or high temperatures. Stability of lithium battery electrochemical performance. There are three main purposes for aging:
1. After the lithium battery undergoes the pre-forming process, a certain amount of SEI film will be formed in the graphite negative electrode inside the battery, but this film has a tight structure and small pores. Aging the battery at high temperatures will help the SEI structure to reorganize and form a loose Porous membrane.
2. The voltage of the battery after formation is in an unstable stage, and its voltage is slightly higher than the real voltage. The purpose of aging is to make its voltage more accurate and stable.
3. Placing the lithium battery at high or normal temperature for a period of time can ensure that the electrolyte can fully infiltrate the pole pieces, which is beneficial to the stability of the battery performance.
The formation-aging process of lithium batteries is indispensable. In actual production, the battery charging and discharging process is selected according to the material system and structural system of the lithium battery, but the formation of the battery must be charged and discharged under the condition of low current. After the two-step key process, the stabilized battery is divided into volumes, and after the packaging and other processes, it can go out.