In order to prevent the battery from short-circuit, it is usually necessary to apply a porous film between two poles of the battery for isolation. Recently, Researchers at Ulsan National Institute of Science and Technology in Korea designed a cellulose c-mat separator to coat a thick layer of macroporous polymer with a thin layer of porous cellulose to effectively solve The traditional electrode separation film is difficult to take into account the contradiction between leakage prevention and ion efficient transmission.
The researchers recently published a paper claiming that the new c-mat barrier they developed was a thinner functionalized nanofiber and a thicker polymer underneath. By fine-tuning the thickness of the two layers, a subtle balance is achieved between leakproof and fast-supporting ion transport: tiny nanopores in the cellulose layer prevent current leakage between the electrodes; larger channels in the polymer layer act as ion "highway" supports Charges are transmitted quickly. It also has an important advantage that at 60 ° C, cells using c-mat membranes retain 80% of their charge after 100 cycles, while only 5% of the battery remains at the same temperature with conventional polymeric separators .
Researchers explained that lithium-ion batteries and commercial batteries will occur side effects, the formation of harmful byproducts such as manganese ions, resulting in high power consumption at high temperatures. The nanoporous cellulose on the c-mat membrane chelates manganese ions to prevent them from participating in the reaction, while the macroporous polymer layer also captures acidic reactants that produce manganese ions, so starting with less manganese ions.
The paper co-author, Li Shanyang, a professor at the School of Energy and Chemistry at the university, said their research shows that the activated cellulose c-mat barrier can reduce the side effects of manganese ions and improve the cycle performance of the battery at high temperatures, more than the most advanced The traditional isolation membrane technology.
Next, they intend to retrofit the barrier so that they can be used in next-generation rechargeable batteries, such as sodium-ion batteries, lithium-sulfur batteries and metal-ion batteries. Li Shan Yang predicts that the next generation high-performance battery with c-mat isolation film has good high-temperature stability. It can be used not only in electric vehicle batteries and grid storage systems, but also in desalination and heavy metal ion monitoring.
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To prevent the battery from short-circuit leakage and take into account the battery efficiency, South Korean scientists have been trying to develop a more efficient battery separator. In fact, as early as 2012, they have produced lithium-ion battery separator, was also the use of cellulose both excellent conductivity, but also has the electrochemical safety, and can be used for a variety of electrolyte characteristics and so on To create high-quality lithium-ion battery. This time, South Korean scientists once again exert their force to use activated cellulose c-mat insulation layer that has less side effects on manganese ions, which further improves the cycling performance of the battery at high temperature and contributes to the new high-efficiency battery.
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