Korea develops new battery cellulose separator

In order to prevent the battery from short-circuiting, it is usually necessary to apply a porous film between the two poles of the battery for isolation. Recently, researchers from the National Institute of Science and Technology in Ulsan, South Korea, designed a cellulose nanomat (c-mat) separator, which added a thin layer of porous cellulose to a thick layer of macroporous polymer. It is difficult for traditional electrode separators to take into account the contradiction between leakage prevention and efficient ion transmission.

Researchers recently published in the "Nano Express" paper, said that they developed a new type of c-mat insulation film is a thin layer of functional nanofibers, the lower layer is a thick polymer. By fine-tuning the thicknesses of the two layers, fine balance is achieved between leakage protection and fast transmission of supporting ions: the tiny nanopores of the cellulose layer prevent leakage of current between the electrodes; the larger pores of the polymer layer serve as ion “high speed” support The charge is transmitted rapidly. It also has an important advantage. At 60°C, the battery using the c-mat film still retains 80% of the electricity after 100 cycles, while the battery with the traditional polymer isolation layer at the same temperature has only 5% of the battery power. .

Researchers explained that lithium salt and water in commercial batteries can cause side reactions and generate harmful by-products such as manganese ions, resulting in significant loss of electricity at high temperatures. The nanoporous cellulose on the c-mat membrane can chelate with the manganese ion, preventing them from participating in the reaction, and the macroporous polymer layer can also capture acidic reactants that produce manganese ions, so the manganese ion is less initially.

Li Shuyang, a co-author and professor of the school's School of Energy and Chemistry, said that their research proved that the active cellulose c-mat barrier can reduce the side effects of manganese ions and improve the cycling performance of the battery at high temperatures. The effect is more advanced than the current state-of-the-art. The traditional isolation membrane technology.

In the next step, they plan to renovate the isolation layer so that it can be used in next-generation rechargeable batteries such as sodium-ion batteries, lithium-sulfur batteries, and metal-ion batteries. Li Shanyang predicts that the next-generation high-performance battery with c-mat as the isolation membrane will have good high-temperature stability. It can be used not only in electric vehicle batteries and grid power storage systems, but also in seawater desalination and heavy metal ion monitoring. (Reporter Chang Lijun)

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