Lithium-ion batteries use carbon materials as the negative electrode and lithium-containing compounds as the positive electrode. There is no metal lithium, only lithium ions. This is a lithium-ion battery. Lithium-ion battery refers to the general term of a battery that uses lithium ion intercalation compound as the positive electrode material. The charging and discharging process of a lithium ion battery is the process of intercalation and deintercalation of lithium ions. In the process of intercalation and deintercalation of lithium ions, it is accompanied by the intercalation and deintercalation of electrons equivalent to lithium ions (usually the positive electrode is represented by intercalation or deintercalation, and the negative electrode is represented by insertion or deintercalation). In the process of charging and discharging, lithium ions are intercalated/deintercalated and intercalated/deintercalated between the positive and negative electrodes, which is visually called "rocking chair battery".