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3. Introduction to customized structure and principle of lithium-ion batteries

Before customizing lithium-ion batteries, it was the first time to understand that a passivation film can form on the phase interface between the negative electrode and the electrolyte during the battery charging and discharging process. It serves as a separator between the electrode and the electrolyte. It is an electronic insulator but an excellent conductor of lithium ions. Lithium ions can be freely embedded and removed through the passivation layer, which has the characteristics of solid electrolyte. Therefore, this passivation film is called solid electrolyte interface, or SEI for short. The customization of lithium-ion batteries is mainly composed of positive and negative electrode materials, electrolytes, separators, current collectors, and battery shells. The positive and negative electrode materials are composed of two different lithium-ion intercalation compounds. During charging, lithium ions are detached from the positive electrode and embedded into the negative electrode through the electrolyte membrane, while during discharge, the opposite is true.

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