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NTIS 바로가기Korean chemical engineering research = 화학공학, v.57 no.2, 2019년, pp.267 - 273
조민수 (충북대학교 공업화학과) , 조중상 (충북대학교 공업화학과)
Hierarchically porous
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핵심어 | 질문 | 논문에서 추출한 답변 |
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섬유 표면 관찰 시 표면에 작은 기공들은 어떻게 생겼나? | 480 nm의 평균 직경을 갖는 균일한 섬유를 확인했으며 단면사진의 경우 섬유의 파단 시, PAN과 PS 고분자가 연신된 모습이 확인되었다. 특히, 섬유 표면 사진의 관찰을 통해 표면에 작은 기공들이 관찰되었는데 이는 60%의 높은 상대습도 조건 하에서 구조체로 침투된 수분이 전기 방사 공정 후 기화되면서 생성된 기공이다. 즉, 전기방사 공정 중 방사용액 내 DMF (0. | |
흑연의 활용과 한계는? | 리튬 이차전지는 소형 전자기기뿐만 아니라 최근 전기차 및 energy storage system (ESS) 등 중대형 전지로 적용을 위한 연구가 활발히 진행됨에 따라 이를 충족시키기 위한 새로운 전극재료가 요구되고 있다[1-3]. 흑연은 저렴한 가격 및 안정적인 수명특성 때문에 상용의 리튬 이차전지의 음극재료로 사용되고 있지만 낮은 이론용량(372 mAh g-1)은 고용량 및 고율 특성을 요구하는 중대형 전지로의 적용에 한계가 있다[4-6]. Conversion 또는 합금 반응을 통해 리튬이온의 저장이 가능한 전이금속산화물 중, Fe2O3는 1005 mA h g-1의 높은 이론용량, 저비용, 친환경적인 특징을 갖기 때문에 상용 흑연의 대체가능 재료로서 연구되고 있다. | |
리튬이온의 저장이 가능한 전이금속산화물 중, Fe2O3의 문제는 무엇인가? | Conversion 또는 합금 반응을 통해 리튬이온의 저장이 가능한 전이금속산화물 중, Fe2O3는 1005 mA h g-1의 높은 이론용량, 저비용, 친환경적인 특징을 갖기 때문에 상용 흑연의 대체가능 재료로서 연구되고 있다. 그러나 낮은 전기전도도 및 충,방전 과정 중 큰 부피 변화는 전지의 낮은 가역 용량 및 전지 수명의 단축을 야기한다[7,8]. 따라서 이를 개선하기 위해 다양한 나노 구조체 (나노튜브, 다공성구조, 요크쉘 구조 등)가 적용되었다. |
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