Positive electrode: active material, conductive agent, solvent, binder, matrix. The electrode that obtains electrons from the external circuit when the battery is discharged, and the electrode undergoes a reduction reaction at this time. Usually the electrode with high potential. Lithium cobalt oxide and lithium manganate electrodes in lithium ion batteries. Cathode materials have the largest market volume and high added value in lithium-ion batteries, accounting for about 30% of the cost of lithium-ion batteries, and the gross profit rate is more than 70%.
Negative electrode: active material (graphite, MCMB, CMS) binder, solvent, matrix. The electrode that transports electrons to the external circuit when the battery is discharged, and the electrode undergoes an oxidation reaction at this time. Usually the electrode with low point, graphite electrode in lithium ion battery. Negative materials account for a relatively low proportion of the cost of lithium batteries, and carbon negative materials and non-carbon negative materials are important.
Diaphragm: The diaphragm is placed between the two stages as a device to isolate the electrodes to prevent the active material on the two stages from directly contacting and causing a short circuit inside the battery. When the separator still needs to allow charged ions to pass through, to form a pathway. The market-oriented diaphragm material is mainly a polyethylene (POLYETHYLENE, PE) polypropylene (POLYPROPLENE, PP)-based polyolefin (POLY) type diaphragm, of which PE products are mainly made by wet process, PP products are mainly made by dry process. Process made.
Electrolyte: Lithium-ion battery point solution materials focus on safety and high environmental adaptability. Important developments will focus on: new solvents (widening the working temperature and environment range), ionic liquids, new lithium salts (improving environmental adaptability), additives (flame retardant, redox shuttle, protective film formation of positive and negative electrodes) and so on.
Battery shell: divided into steel shell (square is rarely used), aluminum shell, nickel-plated iron shell (used for cylindrical batteries), aluminum-plastic film (soft packaging), etc., as well as the cap of the battery, which is also the positive and negative terminals of the battery.
Post time: Oct-21-2022