With the development of technology, lithium batteries have also made great progress, and the scope of use has become more and more extensive. In fact, the structure of lithium batteries is divided into two categories: split winding and stacked. Then the lithium battery structure is mainly composed of five large blocks, namely: positive electrode, negative electrode, electrolyte, diaphragm, outer casing and electrode lead.
Then lithium batteries are divided into two kinds of liquid lithium batteries, one is a polymer lithium battery, wherein the liquid lithium battery uses a winding structure, and the polymer lithium battery has two.
The coiled positive electrode film, the separator and the negative electrode film are sequentially placed and wound into a cylindrical shape or a flat cylindrical shape, and are mainly represented by SANYO, TOSHIBA, SONY, and ATL. The stacked type is stacked in a plurality of layers such as a positive electrode, a separator, a negative electrode, a separator, and a positive electrode. All the positive electrodes are welded together and the negative electrodes are also welded together, mainly represented by ATL.
Currently used lithium battery materials are lithium cobaltate, lithium nickelate and lithium manganate. The most used material is lithium cobaltate, which has good cycle performance and is easy to manufacture. The disadvantage is that cobalt compounds are more expensive. Lithium nickelate is difficult to manufacture because of its unstable nature. It is usually used as a nickel-cobalt-doped nickel compound, also known as lithium nickel cobaltate. Lithium manganate is also a very good material, and the decay of lithium manganate at high temperatures is relatively fast, and many other reasons are still in the laboratory stage.