Principle for improving all-solid-state battery performance discovered

A key mechanism that can dramatically improve the performance of all-solid-state batteries has been discovered by a domestic research team, drawing attention. An all-solid-state battery is a battery that replaces the existing flammable liquid 'electrolyte' that transfers ions between the positive and negative



electrodes with a solid one. It is known as a next-generation battery because it is free from the risk of explosion and has high energy density. The National Research Foundation of Korea (Chairman Hong Won-hwa) announced on the 16th that Professor Kim Dong-wan's research team at Korea University developed a new process that can maximize the performance of lithium argyrodite-based solid electrolyte, a key material for next-generation all-solid-



state batteries, and discovered the mechanism for improving performance. Lithium argyrodite, a sulfide-based lithium-ion conductor with high ion conductivity, is considered a key material for the development of all-solid-state batteries, but the existing manufacturing process that requires a large amount of energy and time is pointed out as a limitation.



The domestic research team introduced a 'single-solvent-mediated approach' wet process to improve the performance of all-solid-state batteries. [Photo = Korea University]



To overcome these limitations, a wet process-based synthesis method is being studied, but there are many challenges to be solved, such as long reaction times, by-product generation, and the generation of harmful gases due to the use of protic solvents.



The research team introduced a 'single-solvent-mediated approach' wet process to the synthesis process of a sulfide-based lithium-ion conductor for all-solid-state batteries. The substitution concentration of cations (Si) to increase ion conductivity in the lithium argyrodite solid electrolyte was successfully increased to 40%, exceeding the limit of the existing synthesis method (30%).



The solid electrolyte manufactured through the new process had a reduced particle size and an increased surface area-to-volume ratio. This change led to the more effective accumulation of substituted atoms in the space charge layer. As a result, it was proven to be a key mechanism for improving ion conductivity.



In fact, the solid electrolyte manufactured through the new method showed high ion conductivity, proving superior performance compared to the existing method. The National Research Foundation of Korea explained that this study has high academic value in that it scientifically revealed the core principles of improving the performance of solid electrolytes.



Professor Kim Dong-wan said, "The greatest significance of this study is that it has identified the mechanism for dramatically improving the performance of key materials for next-generation all-solid-state batteries," and "We will actively pursue follow-up research to develop safer and higher-performance all-solid-state batteries in the future."



The research results (paper title: Breaking the Upper Limit of Substitution Concentration in Li Argyrodite Solid Electrolytes Using a Single-Solvent-Mediated Approach) were published in the March 25 issue of Advanced Energy Materials, an international academic journal in the materials field.





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