Lithium batteries are divided into lithium batteries and lithium ion batteries. Cell phones and laptops use lithium ion batteries, which are commonly known as lithium batteries. Batteries generally use materials containing lithium as electrodes, which are representative of modern high-performance batteries. The real lithium battery is rarely used in daily electronic products due to its high risk.

　　Lithium ion batteries were first successfully developed by Sony Corporation of Japan in 1990. It embeds lithium ions into carbon (petroleum coke and graphite) to form a negative electrode (traditional lithium batteries use lithium or lithium alloy as the negative electrode). LixCoO2 is commonly used as the cathode material, and LixNiO2, and LixMnO4 are also used. The electrolyte uses LiPF6 + diethylene carbonate (EC) + dimethyl carbonate (DMC).

　　Petroleum coke and graphite are non-toxic materials for the negative electrode, and the resources are sufficient. Lithium ions are embedded in the carbon, which overcomes the high activity of lithium and solves the safety problems of traditional lithium batteries. The positive electrode LixCoO2 can reach the charge and discharge performance and life. Higher level, lower cost, in short lithium

　　(1) Positive electrode-the active material is generally lithium manganese oxide or lithium cobalt oxide, and lithium nickel cobalt manganese oxide materials. Electric bicycles generally use lithium nickel cobalt manganese oxide (commonly known as ternary) or ternary + a small amount of lithium manganate, pure Lithium manganese oxide and lithium iron phosphate are gradually fading out due to their large size, poor performance or high cost. Electrolytic aluminum foil with a thickness of 10-20 microns is used for the conductive electrode fluid.

　　(2) Diaphragm-a specially formed polymer film with a microporous structure that allows lithium ions to pass freely, but electrons cannot pass.

　　(3) Negative electrode-the active material is graphite, or carbon with a similar graphite structure, and the conductive current collector uses electrolytic copper foil with a thickness of 7-15 microns.

　　(4) Organic electrolyte—carbonic acid ester solvent with lithium hexafluorophosphate dissolved, and gel electrolyte for polymer.

　　(5) Battery shell-divided into steel shell (square type is rarely used), aluminum shell, nickel-plated iron shell (for cylindrical batteries), aluminum plastic film (soft packaging), etc., as well as battery caps, which are also the positive Negative terminal