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Introduction to the structure and principle of lithium ion battery

From:CTECHI GROUP Limited     Release time:2019-11-01

Overview:Before the lithium-ion battery is customized for the first time, during the charging and discharging process of the battery, a passivation film can be formed on the phase interface between the negative electrode and the electrolyte.

Introduction to the structure and principle of lithium ion battery

Before the lithium-ion battery is customized for the first time, during the charging and discharging process of the battery, a passivation film can be formed on the phase interface between the negative electrode and the electrolyte. It acts as a membrane between the electrode and the electrolyte. It is an excellent insulator of lithium ion. The lithium ion can be freely embedded and removed through the passivation layer. It has the characteristics of a solid electrolyte, so this passivation film It is called "solid electrolyte interface film", referred to as SEI.

Lithium-ion battery customization is mainly composed of positive and negative materials, electrolyte, separator, current collector and battery casing. The positive and negative materials are composed of two different lithium ion intercalation compounds. When charging, lithium ions are deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte through the separator, and the opposite is true when discharging.


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