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카본 코팅된 니켈-코발트 황화물의 요크쉘 입자 제조 및 소듐 이온 배터리의 음극 소재 적용
서효영,박기대 한국분말재료학회 2023 한국분말재료학회지 (KPMI) Vol.30 No.5
Transition metal chalcogenides are promising cathode materials for next-generation battery systems, particularly sodium-ion batteries. Ni3Co6S8-pitch-derived carbon composite microspheres with a yolk-shell structure (Ni3Co6S8@C-YS) were synthesized through a three-step process: spray pyrolysis, pitch coating, and post-heat treatment process. Ni3Co6S8@C-YS exhibited an impressive reversible capacity of 525.2 mA h g-1 at a current density of 0.5 A g-1 over 50 cycles when employed as an anode material for sodium-ion batteries. However, Ni3Co6S8 yolk shell nanopowder (Ni3Co6S8-YS) without pitch-derived carbon demonstrated a continuous decrease in capacity during charging and discharging. The superior sodium-ion storage properties of Ni3Co6S8@C-YS were attributed to the pitchderived carbon, which effectively adjusted the size and distribution of nanocrystals. The carbon-coated yolk-shell microspheres proposed here hold potential for various metal chalcogenide compounds and can be applied to various fields, including the energy storage field.
소셜 네트워킹 서비스(SNS) 관련 연구의 분류와 연구 동향
정기주,서효영,조성도 한국지식정보기술학회 2011 한국지식정보기술학회 논문지 Vol.6 No.5
The purpose of this study is to conduct content analyses to figure out current trends of social networking services studies and present the directions for the future research. This study analyzes 53 domestic studies and 10 international research based upon key words. The results indicate that SNS systems, web-site quality, communications, marketing and consumers' use motives are the main research topics. Prior research mainly put high priorities on systems and web-site qualities that are the main issues in the area of management information system. In contrast, marketing and consumers' use motives are the current issues. In the future besides management information system the studies on SNS should include more applied areas such as marketing, consumers' motives and other management topics.