The manufacture of lithium-ion batteries is a process in which the process steps are closely linked. Overall, the production of lithium batteries includes the manufacturing process of the electrode, the battery assembly process, and the final electrolyte injection, battery case sealing, battery formation, and aging processes. In the three-stage process, each process can be divided into several key processes, each step will have a great impact on the final performance of the battery.

The concept of formation is to charge and discharge a small current to the manufactured lithium ion battery. After the lithium battery is manufactured, it is necessary to charge and discharge the battery with a small current. there are mainly two purpose of pre-charging.

After the battery is fabricated, the electrode material is not in the best applicable state, or the physical properties are not suitable (such as too large particles, the contact is not close, etc.), or the phase itself is wrong (such as some metal oxide anodes with alloy mechanism), requires first charge and discharge to activate.

During the first charge of the lithium battery, Li + is released from the cathode active material, passes through the electrolyte-separator-electrolyte, and is inserted between the layers of the anode graphite material.

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