Lithium-ion batteries use lithium-containing compounds as the positive electrode. During the charging and discharging process, lithium ions are extracted and inserted back and forth between the positive and negative electrodes of the battery to achieve charging and discharging. Lithium ion ups battery is actually a kind of lithium ion concentration difference battery. When the battery is charged, the lithium ions on the positive electrode material of the battery are released, move to the surface of the negative electrode through the electrolyte, and are embedded in the negative electrode material; during discharge, the lithium ions embedded in the negative electrode material are released and reinserted into the positive electrode material.
Since the first commercialization of Sony Corporation in Japan in 1991, according to different cathode materials and electrolytes, lithium-ion batteries have developed a variety of battery systems including Lithium cobaltate battery, lithium manganate battery, lithium iron phosphate battery, lithium titanate batteries, ternary materials lithium batteries, polymer lithium batteries, and so on. Due to the advantages of high energy density, long life, low self-discharge, and no memory effect, lithium-ion batteries have been widely used in digital portable products, and are gradually entering new energy electric vehicles, energy storage power stations and other application fields.
Among various lithium-ion batteries,
(1) Lithium cobalt oxide battery has the most mature industrialization and the highest energy density of its products. It has been widely used in small mobile devices such as mobile phones and notebook computers. At present, companies such as Panasonic and Sony in Japan, Samsung SDI and LG Chem in South Korea, BYD in China, Lishen and BAK, etc., almost control the global lithium cobalt oxide battery industry. Among them, Japanese companies occupy the high-end market, and Chinese companies occupy the low-end market. For safety reasons, lithium cobalt oxide batteries are not suitable for high-power and large-capacity applications.
(2) Lithium manganese oxide battery has the advantages of low cost and high performance, and its product safety is higher than that of lithium cobalt oxide battery. It is a popular alternative technology for electric vehicle batteries and occupies an important position in the global power battery field. Japanese companies are the first to develop and apply lithium manganate batteries and have the most advanced technology. Sony, Sanyo (which has merged with Panasonic) and Nissan AESC are all vigorously developing lithium manganese batteries; South Korean companies have invested heavily in this field. Following Japanese companies, Samsung SDI and LG Chem already have considerable strengths. Due to the high requirements for production technology, most Chinese companies did not choose to invest in this field. At present, only a few companies such as Guoanmenguli and other companies insist on developing this technology.
(3) Lithium iron phosphate battery has the advantages of long life, low cost and high safety. It is currently one of the most popular electric vehicle battery technologies and one of the popular candidate technologies for electric energy storage systems. In recent years, lithium iron phosphate batteries have been highly developed in China. Both the private sector and the government have high hopes for this technology. Representative companies include BYD, BAK, Lishen and so on. However, from the perspective of product performance, the products of North American companies are still leading the world. The iconic company is A123 of the United States. The company’s products are clearly ahead of other companies’ products in terms of low temperature performance, rate performance, and cycle life. In addition, TYCORUN ENERGY, which I know, is also an excellent company that makes good lithium iron phosphate battery ups products.