Lithium battery research and development -Lithium - Ion Battery Equipment

Lithium battery research and development prospects -Lithium - Ion Battery Equipment

Experts on the development of lithium-ion batteries in my country are optimistic

In real life, lithium-ion batteries are developing rapidly, and we seem to be surrounded by lithium. Lithium-ion batteries have become the standard for cell phones, computers, and electric vehicles; if Tesla's energy wall is a sign of the future, lithium-ion batteries will also be at the heart of modern home life. However, the term lithium-ion battery actually covers multiple technologies, which are very different. Chen Lijian, a researcher at the Gusu Nano Institute of the Chinese Academy of Sciences, said that our general understanding of lithium-ion batteries is actually lithium-ion batteries. It relies on lithium ions embedded in the positive and negative electrodes, and converts electrical and chemical energy at the output, and then ends the charging and discharging process.(Lithium - Ion Battery Equipment)

Lithium Ion Batteries: my country's Research and Development Prospects

There are many types of Li-ion batteries based on the positive and negative data. Chen Limei said that lithium cobalt oxide and ternary data are mainly used for the positive electrode of mobile phone batteries, and graphite data is used for the negative electrode. During charging, the positive lithium ions move toward the graphite negative electrode through the electrolyte and intercalate into the graphite interlayer. During the discharge process, the lithium ions between the graphite layers come out and then return to the positive electrode through the electrolyte. The greater the storage capacity of positive and negative data, the greater the potential difference between lithium ions and lithium ions, and the higher the energy density of the battery.

For Tesla batteries, lithium nickel cobalt aluminate (NCA) is used for the positive electrode. Chen Lizhi said. In addition, lithium ion battery anode lithium cobalt acid, ternary data, lithium manganese acid, lithium iron phosphate, etc. Domestic battery giant BYD uses lithium ferrous phosphate as the positive electrode for its electric vehicles.

Since the current anode data is nearly twice the capacity of the cathode data, developing cathode data with a higher specific capacity is a bottleneck factor in improving the energy density of lithium-ion batteries, Chen said. Although the energy density, high temperature and low temperature performance, ratio and many other functional indicators of lithium-ion batteries have been much higher than those of traditional lead-acid batteries, nickel-metal hydride batteries and other secondary batteries, the progress of functions such as energy density and cycle life has been accelerated. , but it is still difficult to meet the rapid development of consumer electronics, electric vehicles, grid energy storage and other emerging industries.

In order to further improve the performance of batteries, in addition to lithium-ion batteries, there are several research institutes and start-up companies around the world who are researching new types of lithium-ion batteries. Taking the lithium-sulfur battery studied by Chen Lizhi as an example, with sulfur as the positive electrode and metallic lithium as the negative electrode (strictly speaking, lithium-ion battery), the energy density of its components is expected to be more than twice that of existing lithium-ion batteries. In addition, research hotspots of lithium-ion batteries include lithium-air batteries and the use of solid-electrolyte lithium-ion batteries.

If these new batteries can be put into practical use, the energy density of the batteries can be greatly improved, promoting the development of categories such as consumer electronics, new energy vehicles, and energy storage. The benefits are many, but also the risks. Chen said: There are often demonstration versions of new batteries, but even with the results published in important journals, many landmines have been encountered during the engineering process, and there are many difficulties in using them successfully. new technology.

Industry progress measures are important for the development of lithium-ion batteries on the basis of mature systems, according to different use requirements, targeted through doping, surface coatings, electrode materials body structure design stage, such as electrolyte formulation, process control , Gradually some aspects of functional performance, reduce side-use, ensure product safety, reliability, the industry is such a gradual improvement. Chen Lizhi said.



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