Lithium-ion batteries usually come in two shapes: cylindrical and square. Inside the battery is a spiral-wound structure with a very fine and permeable polyethylene film isolation material spaced between the positive and negative electrodes. The positive electrode consists of a current-collecting electrode made of lithium cobalt cobalt oxide (or lithium nickel cobalt manganese oxide, lithium manganese oxide, lithium ferrous phosphate, etc.) and aluminum foil. Negative electrode consists of graphitized carbon material and copper foil composed of current collection pole. The battery is filled with organic electrolyte solution. A safety valve and a PTC element (used in some cylindrical types) are also provided to protect the battery from damage in the event of abnormal conditions and short-circuiting of the output.
There are two types of lithium-ion batteries, liquid lithium-ion batteries (LIB) and polymer lithium-ion batteries (PLB). Among them, liquid lithium-ion batteries are secondary batteries in which Li + embedded compounds are the positive and negative electrodes. The positive electrode uses lithium compounds - lithium cobaltate and lithium manganate, and the negative electrode uses lithium-carbon interlayer compounds. Lithium-ion batteries are ideal energy carriers for the development of the 21st century due to their high operating voltage, small size, light weight, high energy, no memory effect, no pollution, small self-discharge and long cycle life.
Conductive coating
Conductive coating, also known as pre-coating, in the lithium battery industry usually refers to a layer of conductive coating applied to the surface of the positive electrode collector - aluminum foil, coated with conductive coating of aluminum foil is called pre-coated aluminum foil or simply coated aluminum foil. Conductive coating in lithium batteries can effectively improve the adhesion of the pole piece, reduce the use of binder, and at the same time for the battery's electrical performance has been significantly improved. Its earliest experiments in batteries can be traced back to the 70's, and with the development of the new energy industry, especially the development of lithium iron phosphate batteries and the rise of the industry as a hot new technology or new materials.