On October 22, Professor Park Tae-joo’s research team from the Department of Materials Science and Chemical Engineering at Hanyang University announced that they have identified the first quantitative correlation between the composition and conductivity of cathode protective coatings and overall battery performance in sulfide-based all-solid-state batteries.

Sulfide-based all-solid-state batteries are recognized as a promising next-generation energy storage solution due to their high energy density and low risk of explosion. However, interfacial instability between the cathode active material and the solid electrolyte remained a major challenge. To mitigate this, oxide-based coating layers have been introduced on the cathode surface, but previous studies primarily examined the 'presence' or 'thickness' of coatings rather than analyzing the quantitative effects of 토토사이트 토사장 and conductivity on battery performance.

To address this, Professor Park’s team fabricated oxide protective layers of varying compositions(LiZrOₓ) on the surface of NCM811(LiNi₀.₈Co₀.₁Mn₀.₁O₂) cathode materials using the powder-atomic layer deposition(Powder-ALD) technique for all-solid-state systems employing a sulfide electrolyte(Li₆PS₅Cl). By experimentally comparing changes in ionic and electronic conductivity and corresponding performance variations based on Li/Zr compositional ratios, the team elucidated—quantitatively and for the first time—how compositional control influences battery efficiency.

The results showed up to a twentyfold difference in ionic conductivity and a thousandfold difference in electronic conductivity depending on the 토토사이트 토사장 ratio. These differences directly affected key performance indicators such as initial Coulombic efficiency and capacity retention. The optimized 토토사이트 토사장 exhibited roughly a 4.5% improvement in initial efficiency and a 37% increase in life-cycle performance, experimentally proving that cathode protective layer 토토사이트 토사장 is a decisive factor in all-solid-state battery performance.

This study is the first to establish a causal relationship connecting ‘protective layer composition’ to ‘conductivity variation’ and to ‘battery performance enhancement’, thereby shifting focus beyond conventional coating presence studies and introducing a new Composition-Driven Interface Engineering strategy.

Professor Park Tae-joo stated, “This is the first study to quantitatively define how controlled protective layer compositions affect both conductivity and overall cell performance. Our findings establish important design principles for achieving interfacial stability and high energy density in sulfide-based all-solid-state batteries.”

The research also demonstrated the scalability of the Powder-ALD method, which was directly applied to electrode powders instead of conventional wafer substrates. This approach proved viable for mass production of large-area electrode coatings. Leveraging this progress, Professor Park founded ALPES Co., Ltd. in 2022 to commercialize Powder-ALD-based cathode protective coating technology. The company is expanding applications of this technology beyond batteries to diverse industries including post-semiconductor processing powder materials as well as materials in cosmetic and pharmaceutical industries. 

This study was supported by the National Research Foundation of Korea through its Nano and Material Technology Development Program and national R&D initiatives. The results were published online on October 14 in the international journal Advanced Science (IF=14.1) and have been selected as the cover article for the April 2026 issue.

The paper, 토토사이트 토사장-Controlled Cathode Protective Layer via Powder-Atomic Layer Deposition for All-Solid-State Batteries, lists Kwon Gyu-moon, a doctoral student at Hanyang University, as the first author, with Professor Park Tae-joo and Professor Kang Hyo-rang serving as corresponding authors.