Thanks to great advances made, lithium batteries are increasingly popular. In fact, lithium batteries fall into two categories: split winding and stacking. They can be divided into five parts: positive electrode, negative electrode, electrolyte, diaphragm, outer casing and electrode lead.
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. This construction is mainly encourged by SANYO, TOSHIBA, SONY, and ATL. As to the stacking type, a plurality of layers such as a positive electrode, a separator, a negative electrode, a separator, and a positive electrode are stacked. Both positive and negative electrodes are welded together. This battery construction is endorsed by ATL.
Currently available lithium battery materials include lithium cobaltate, lithium nickelate and lithium manganate, of which the lithium cobaltate is most popular for long cycle life and ease of manufacture. However, cobalt compounds are more expensive. Lithium nickelate is difficult to manufacture because of its unstable nature, so 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, but decay of lithium manganate is relatively fast at high temperatures, so this material is still in the laboratory stage.
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