https://scholarworks.unist.ac.kr/handle/201301/51 Sat, 04 Apr 2026 10:47:15 GMT 2026-04-04T10:47:15Z https://scholarworks.unist.ac.kr/handle/201301/90586 Title: 안티페로브스카이트 고체전해질의 리튬이온전도에 대한 이해 Author(s): Lee, Hyeon Jeong Wed, 26 Oct 2022 15:00:00 GMT https://scholarworks.unist.ac.kr/handle/201301/90586 2022-10-26T15:00:00Z https://scholarworks.unist.ac.kr/handle/201301/90585 Title: Understanding of Li-ion conductivity in antiperovskite solid electrolytes: grains, grain boundaries and interfaces Author(s): Lee, Hyeon Jeong Thu, 06 Apr 2023 15:00:00 GMT https://scholarworks.unist.ac.kr/handle/201301/90585 2023-04-06T15:00:00Z https://scholarworks.unist.ac.kr/handle/201301/90584 Title: 전고체전지용 고전압 양극재 미세구조 제어에 대한 연 Author(s): Lee, Hyeon Jeong Abstract: Solid-state batteries (SSB) have received singificant attention as a next-generation energy storage technology due to their high potential safety and energy density. here, a 4.5V LiNi0.5Mn1.5O4(LNMO) cathode with a hollow microstructure is combined with a Li6PS5CI electrolyte and Li-In anode to achieve full utilization of the cathode at a given C-rate. The hollow LNMO synergistically paired with a roobust oxide layer exhubuts stable cycling by mitigating the side reactions between the sulphide solid eletrolyte and cathode while constraining the volume change during cycling. THe optimized cathode-electrolyte system exhibits stable cycling performance (> 70% capacity retention after 100 cycles) even with a high active material loading of 27mg cm-2. This study demonstrates the importance of microstrructure engineering to achivev the performance of LNMO cathodes in SSBs. Wed, 19 Apr 2023 15:00:00 GMT https://scholarworks.unist.ac.kr/handle/201301/90584 2023-04-19T15:00:00Z https://scholarworks.unist.ac.kr/handle/201301/90583 Title: 전고체전지를 위한 양극재 미세구조 설계 Author(s): Lee, Hyeon Jeong Abstract: Solid-state batteries (SSBs) have received attention as a next-generation energy storage technology due to their potential to superior deliver energy density and safety compared to commercial Li-ion batteries. One of the main challenges limiting their practical implementation is the rapid capacity decay caused by the loss of contact between the cathode active material and the solid electrolyte upon cycling. Here, we use the promising high-voltage, low-cost LiNi0.5Mn1.5O4 (LNMO) as a model system to demonstrate the importance of the cathode microstructure in SSBs. We design Al2O3-coated LNMO particles with a hollow microstructure aimed at suppressing electrolyte decomposition, minimizing volume change during cycling, and shortening the Li diffusion pathway to achieve maximum cathode utilization. The combination of the Al2O3 capping layer and the hollow microstructure alleviates the volume change of the LNMO particles, thus improving the long-term cyclability of the SSB. When cycled with a Li6PS5Cl solid electrolyte, we demonstrate a capacity retention above 70% after 100 cycles, with an active material loading of 27mg cm-2 (2.2mAh cm-2). Wed, 06 Dec 2023 15:00:00 GMT https://scholarworks.unist.ac.kr/handle/201301/90583 2023-12-06T15:00:00Z