Let’s take a look at the components of a lithium-ion battery.

Steel shell/aluminum shell/cylindrical/soft packaging series of lithium battery:

(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 faded out due to their large size, poor performance or high cost. The conductive current collector uses electrolytic aluminum foil with a thickness of 10-20 microns.

(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, while gel electrolyte is used 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 The negative terminal.