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Lithium-ion battery is a type of rechargeable battery that uses lithium ions as the primary component of its electrolyte. It is known for its high energy density, lightweight, and ability to retain a charge over time. Lithium-ion batteries are widely used in portable electronics, electric vehicles, and renewable energy applications due to their efficiency and long cycle life. The battery operates by moving lithium ions from the anode to the cathode during discharge and back when charging, enabling the storage and release of electrical energy.