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- W1998103680 abstract "현재 이차전지에서 사용중인 양극활물질은 구조 안정성이 높은 층상구조(Layered Structure)의 리튬 금속 산화물(Solid State Lithium Oxide Compounds)이 주로 사용된다. 최근에는 리튬이차전지의 성능향상을 위해서 음극활물질과 전해질 사이의 계면뿐만 아니라, 양극활물질과 전해질 사이의 계면에 관한 연구가 활발히 진행되고 있으며, 이러한 계면의 연구를 위해서는 음극활물질 뿐만 아니라, 양극활물질의 표면에 관한 연구도 선행적으로 이루어져야 하는 상황이다. 대표적인 리튬금속 산화물질인 니켈산리튬( $LiNiO_2$ )과 코발트산리튬( $LiCoO_2$ )은 서로 매우 유사한 구조를 갖는 층상구조의 양극활물질이다. 코발트산리튬이 다양한 실험적, 이론적 연구가 진행된 반면에, 니켈산 리튬은 실험적 연구에 비해서 이론적 연구가 부족하다. 따라서, 본 연구에서는 니켈산리튬의 X-선 회절계 측정 결과(XRD data)에 나오는9개의 표면 방향을 범밀도함수이론(Density Functional Theory)을 이용하여 니켈산리튬 표면의 표면 에너지를 계산하였다. 니켈산리튬의 X-선 회절계 측정 결과(XRD data)에서는 (003), (104), (101), (110) 결정 등등이 순차적으로 주요하게 존재하는 것으로 확인되었다. 그러나 시뮬레이션을 이용한 각각의 표면 에너지 계산 결과, X-선 회절계 측정 결과와 다른 순서로 안정한 표면 에너지가 나타나는 결과를 얻었다. 따라서 에너지적으로 안정한 표면이자, X-선 회절계에서 주요하게 나타나는 (104)와 (101) 방향의 니켈산리튬 표면이 많이 노출되어 Li 이온의 충방전시 리튬의 삽입 탈리에 영향을 줄 것으로 예상된다. 【Solid state lithium oxide compounds of layered structure, which has high stability of structure, are mainly used as the cathode materials in lithium-ion batteries (LIBs). Recently, the investigation of Solid Electrolyte Interphase (SEI) between active materials and electrolyte has been focusing to improve the performance of lithium-ion batteries. For the investigation of the SEI, the study of surface properties of cathode materials and anode materials is also required in advance. $LiNiO_2$ and $LiCoO_2$ are very similar layered structure of cathode active materials and representative solid state lithium oxide compounds in LIBs. Various experimental and theoretical studies have been doing for $LiCoO_2$ . The theoretical investigation of $LiNiO_2$ is not sufficient, however, even if experimental studies of $LiNiO_2$ are enough. In this study, the surface energies of nine facets of $LiNiO_2$ crystal facets were calculated by Density Functional Theory. In XRD data of $LiNiO_2$ , (003), (104), (101), et al. facets are main surfaces in order. However, the results of calculation are different with XRD data. Thus, both (104) and (101) facets, which are energetically stable and measured in XRD, are mainly exposed in the surface of $LiNiO_2$ and it is expected that intercalation and de-intercalation of Li-ion will be affected by them.】" @default.
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- W1998103680 date "2013-08-31" @default.
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- W1998103680 title "First-Principles Investigation of the Surface Properties of LiNiO2as Cathode Material for Lithium-ion Batteries" @default.
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- W1998103680 doi "https://doi.org/10.5229/jkes.2013.16.3.169" @default.
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