UNIST · Engineering
이 교수의 연구실은 리튬이온 및 리튬 메탈 이차전지의 핵심 소재와 인터페이스 문제를 해결하기 위한 나노소재 및 전기화학적 시스템 개발에 집중하고 있습니다. 특히 고용량 양전지 소재, 나노와이어 기반 전극, 리튬 도메인 성장 억제를 위한 표면 구조 제어, 그리고 고체전해질과의 인터페이스 거동에 대한 실시간 압력 측정 기법을 통해 전지의 안정성과 성능 향상을 연구하고 있습니다. 다양한 나노구조 재료의 합성 및 특성 분석을 통해 실용적이고 경제적인 에너지 저장 소재의 개발을 추구하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Ultrathin LiMn(2)O(4) nanowires with cubic spinel structure were synthesized by using a solvothermal reaction to produce α-MnO(2) nanowire followed by solid-state lithiation. LiMn(2)O(4) nanowires have diameters less than 10 nm and lengths of several micrometers. Galvanostatic battery testing showed that LiMn(2)O(4) nanowires deliver 100 and 78 mAh/g at very high rate (60C and 150C, respectively) in a larger potential window with very good capacity retention and outstanding structural stability.
The propensity of lithium dendrite formation during the charging process of lithium metal batteries is linked to inhomogeneity on the lithium surface layer. The high reactivity of lithium and the complex surface structure of the native layer create "hot spots" for fast dendritic growth. Here, it is demonstrated that a fundamental restructuring of the lithium surface in the form of lithium silicide (Li<sub>x</sub> Si) can effectively eliminate the surface inhomogeneity on the lithium surface. In
Abstract A significant volume expansion exhibited by high‐capacity active materials upon lithiation has hindered their application as Li‐ion battery anode materials. Although tremendous progress has been made in the development of coating methods that improve the stability of high‐capacity active materials, suitable coating sources that are both strong and economical to use are yet to be discovered. Pitch is reported here as a promising coating source for high‐capacity anodes owing to the high m
Although solid-state batteries with lithium metal could enable higher energy density and better safety characteristics than Li-ion batteries, the complex electro-chemo-mechanical evolution of the Li–solid-state electrolyte interface can diminish performance. Here, we measure the stack pressure in real time to provide new insights into the effects of applied stack pressure and electrolyte processing on the interfacial behavior of two representative solid-state electrolytes, Li10SnP2S12 and Li6PS5
A facile synthetic strategy was implemented to obtain nanosized barium titanate ( BaTiO 3 ) powders with tetragonal structure. The nanoparticles were synthesized using solvothermal process employing diethanolamine and triethanolamine to suppress the particle growth and the as‐prepared nanopowders were characterized using X‐ray diffraction, scanning electron microscopy, and high‐resolution dispersive R aman spectroscopy. It was found that the particle size can be easily tuned by adjusting the exp
