A lithium-ion battery is primarily composed of a cathode, anode, electrolyte, and separator.
Common cathode materials include lithium cobalt oxide (LiCoO₂) and lithium manganese oxide (LiMn₂O₄). During the charging process, lithium ions are released from the cathode and migrate to the anode through the electrolyte. For example, in lithium cobalt oxide, lithium atoms lose electrons during charging, and lithium ions (Li⁺) leave the crystal structure of the cathode material.
Graphite is the most commonly used anode material. When lithium ions reach the anode, they embed into the layered structure of graphite. During discharging, lithium ions are released from the anode and return to the cathode, while electrons flow from the anode to the cathode through an external circuit, generating electric current.
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