What are the effects of lithium battery aging experiments on lithium battery performance

The activation stage includes pre-charging, formation, aging, constant volume and other stages. The purpose of pre-charging and forming is to allow the positive and negative materials to perform the first few cycles of charging and discharging to activate the materials, so that the materials are in the best use condition. There are several important aging intentions: one is to make the electrolyte more moisturizing, which is conducive to the stability of the battery function; the other is that the active materials in the positive and negative materials can accelerate the progress of some side-uses after aging, such as gas production, Electrolyte differentiation, etc., make the electrochemical function of the lithium battery quickly reach stability; third, the consistency of the lithium battery is selected after a period of aging. After formation, the voltage of the battery cell is unstable, and its measured value will violate the practice value. The voltage and internal resistance of the battery cell after aging are more stable, making it easier to choose a battery with high consistency. The commonly known lithium titanate battery is a battery that uses lithium titanate for the negative electrode, and the material for the positive electrode is still ternary, lithium cobaltate and other materials. The difference between lithium titanate battery and graphite anode battery is that the lithium intercalation potential of lithium titanate is 1.55V (phase related lithium metal), which is higher than 0.8V formed by SEI, so it will not form a solid electrolyte membrane during charge and discharge ( SEI) also does not constitute dendritic lithium, which has higher safety. This means that during the charging process of lithium titanate, electrons and electrolyte are constantly reacting, generating by-products and generating hydrogen, CO, CH4, C2H4 and other gases, which will cause the battery to bulge. The bulging problem of lithium titanate is urgently alleviated by the change of the nature of the data, such as the surface coating of the data, changing the particle size distribution, and finding a suitable electrolyte. In addition, optimized pre-charge, chemical conversion, and aging criteria can also appropriately reduce lithium titanate bulging. The aging criterion of lithium titanate battery is generally the high temperature aging criterion. The aging temperature is 40℃-55℃, and the aging time is generally 1-3 days. After aging, negative pressure exhaust is required. Carry out multiple high-temperature agings to fully respond to the moisture inside the battery. After the gas is discharged, the flatulence problem of the lithium titanate battery can be effectively suppressed and its cycle life can be improved. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Cylindrical lithium battery compared to the characteristics of square lithium battery