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신지웅,남윤채,손종태 한국전기화학회 2019 한국전기화학회지 Vol.22 No.4
The first commercialized cathode material, LiCoO2, suffers from disadvantages such as high cost and toxicity and also possesses safety problems. The nickel-rich LiNi0.9Mn0.1O2 cathode material, used as an alternative to LiCoO2, has highly reversible capacity and high energy density. So, the nickel-rich LiNi0.9Mn0.1O2 cathode material is widely used as an alternative to LiCoO2 due to its highly reversible capacity and high energy density. However, LiNi0.9Mn0.1O2 has several disadvantages as well, such as poor cycle performance and poor thermal instability. To address these problems, we synthesized a new material, LiNi0.5Mn0.5O2, as a shell on the surface of a core to suppress the surface degradation. The new material showed high structural and thermal stabilities and could also maintain a high capacity. The capacity retention of the core-shell cathode (87.7%) was better than that of the core cathode (76.9%) after 50 cycles. Analysis using differential scanning calorimetry revealed that the heat generation in the core-shell cathode (65.9 Jg-1) was lower than that in the core cathode (559.7 Jg-1).
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안서현,김은혜,이채미,남윤채,이주연,송진숙,김성환,전문국 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.11
A central nervous system (CNS)-oriented compound collection was screened to find hit compounds for human glioblastoma T98G cell growth inhibition. A series of quinoxaline-based derivatives were identified as hit compounds having one- to two-digit micromolar GI50 values. Anti-glioblastoma activity was improved in structure–activity relationship studies varying the substituents on the quinoxaline ring system, resulting in the discovery of four compounds exhibiting sub-micromolar GI50 values. The potentials of the four compounds to induce apoptosis were confirmed by annexin V staining assay. The development potential of the four compounds as CNS drug leads was evaluated by in vitro MDR-MDCK cell permeability and in vivo brain disposition in mice. The mouse pharmacokinetic and kinome profiling studies for compound 10g, which showed high brain-penetrating ability, revealed that the compound is orally bioavailable and inhibits the kinase activities of anaplastic lymphoma kinase (ALK) and Erb-B2 receptor tyrosine kinase (ERBB3).
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