Lithium ion batteries use carbon materials as the negative electrode, with lithium -containing compounds as positive electrodes. There is no metal lithium, only lithium ions. This is lithium ion battery. Lithium -ion battery refers to the general term with lithium ion embedded compound as a positive electrode material battery. The charging and discharge process of lithium ion batteries is the embedded and dehydration process of lithium ions. During the embedded and deserted process of lithium ion, it is accompanied by the embedded and dehydration of the volume electrons such as lithium ion (used to expressed the embedded or dehydration of the positive pole, and the negative pole is expressed by insertion or insertion). During the charging and discharge process, lithium ions are embedded in/off, and inserted/off -insertion between positive and negative electrodes, which are vividly called "rocking chair batteries".

　　When the battery is charged, the battery is generated on the positive electrode of the battery, and the generated lithium ion is moved by electrolyte to the negative electrode. As a layered structure of the negative electrode, it has a lot of micropores. The lithium ion that reaches the negative electrode is embedded in the carbon layer micropores. The more lithium ion is embedded, the higher the charging capacity. Similarly, when the battery is discharged (that is, the process of using the battery), the lithium ion embedded in the negative electrode carbon layer is removed and moved back to the pole. The more lithium ion is back, the higher the discharge capacity.

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