Korean researchers develop COF solid ion conductors that are expected to become the next generation of batteries
According to foreign media reports, researchers from the Ulsan National Institute of Science and Technology (UNIST) in South Korea demonstrated a new type of solvent-free single lithium ion conductive covalent organic skeleton. The research was jointly led by Sang-Young Lee and Sang Kyu Kwak, professors at the UNIST School of Energy and Chemical Engineering. In the course of the research, the research team showed the new concept of "solid ion conductor", which can selectively pass lithium ions through ion channels. Because they are solid and can effectively transfer lithium ions, they are expected to be the raw materials for next-generation batteries, such as high-voltage batteries or lithium metal batteries. Currently, lithium-ion batteries use a highly flammable liquid electrolyte, which is very prone to fire or explosion. As an alternative, a solid electrolyte is under development, but its ionic conductivity is lower than that of a liquid electrolyte. Especially in terms of improving battery performance, many solid electrolytes have limitations, because the migration path of ions is tortuous and complicated. Professor Lee uses porous crystalline materials as ion conductors, such as covalent organic frameworks (COF), to solve this problem. By regularly arranging lithium ion channels inside the material, the ion conductivity is greatly improved. The first author of the study, Dr. Kihun Jeong of the UNIST Energy and Chemical Engineering Institute, said: "The newly developed ionic conductor is a solid phase carrier that does not use liquid at all and realizes the conductive behavior of solid single lithium ions." Single lithium ion conduction behavior means that ideally, only lithium ions are transported through the electrolyte. Since lithium ions are cations, they easily move with anions. Unnecessary anion migration will cause side reactions on the electrode surface, reducing battery performance. In this study, anions are fixed in the path through which lithium ions pass, and an organic monomer structure is synthesized using anionic monomers paired with lithium ions. In this way, only lithium ions flow along the channel to achieve the ideal flow state. Researchers theoretically determine the use of computational chemistry. In computational science, lithium ions move along the regularly arranged oxygen atoms in the ion conductor channels. Professor Lee said: "This research provides a new direction for the design of solid ion conductors and lays the foundation for the development of" high-performance solid electrolytes. "This is critical to the commercialization of next-generation batteries, including all solid-state batteries. Such conductors It can selectively and efficiently transport lithium ions, and it does not need to use explosive organic solvents at all. It has extraordinary significance. These ionic conductors are not only suitable as electrolytes for solid-state batteries, but also can be applied to highly active lithium metal electrodes. "(Author : Elisha)
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(Source: UNIST)