The most common secondary lithium battery with high energy density is the lithium-ion battery. When compared to high-capacity NiCd/NiMH batteries, its energy density is 1.52 times greater. It has a 3.6V uniform use voltage, which is three times that of NiCd and NiMH batteries. Because of its high internal resistance, it is not suitable for high-current charging and discharging, and accurate charging and discharging control is required to avoid battery damage and achieve the best application function. Lithium-ion batteries are widely used in a variety of portable electronic products, including cell phones, laptop computers, MP3 players, and so on.
