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SCI Article

Layered K0.28MnO2 center dot 0.15H(2)O as a Cathode Material for Potassium-Ion Intercalation
성명 선양국()
소속 공과대학 에너지공학과
캠퍼스
우수선정주 2019년 12월 3째주
Author Hwang, Jang-Yeon (Dept Energy Engn); 선양국 (Dept Energy Engn);
Corresponding Author Info Myung, ST (reprint author), Sejong Univ, Dept Nanotechnol & Adv Mat Engn, Seoul 05006, South Korea.; Myung, ST (reprint author), Sejong Univ, Sejong Battery Inst, Seoul 05006, South Korea.; Sun, YK (reprint author), Hanyang Univ, Dept Energy Engn, Seoul 0
E-mail 이메일 아이콘yksun@hanyang.ac.kr
Document Type Article
Source ACS APPLIED MATERIALS & INTERFACES Volume:11 Issue:46 Pages:43312-43319 Published:2019
Times Cited 0
External Information http://dx.doi.org/10.1021/acsami.9b18540
Abstract Here, we present K0.28MnO2 center dot 0.15H(2)O, which has a two-dimensional open framework, as an intercalation host for potassium ions. K0.28MnO2 center dot 0.15H(2)O has a layered structure consisting of edge-sharing MnO6 octahedra with a large basal spacing of similar to 7.3 angstrom, which facilitates K+-ion mobility. Water molecules in the interlayers between the MnO2 layers play an important role as a pillar to support the structure during repetitive de/potassiation cycles, as confirmed by an operando X-ray diffraction study. As a result, the large K+ ions readily migrate into the crystal structure, resulting in satisfactory electrochemical performance in K-cells. With the aid of the structural pillar, the K0.28MnO2 center dot 0.15H(2)O cathode delivers a high reversible capacity of 150 mA h g(-1) over 100 cycles at a rate of 0.1 C (15 mA g(-1)), with acceptable power capability up to 5 C-rates.
Web of Science Categories Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
Funding National Research Foundation of Korea (NRF) - Ministry of Education, Science, and Technology of Korea (MEST); Korean GovernmentKorean Government [NRF-2015M3D1A1069713, NRF-2017R1A2A2A05069634, 2019H1D8A2106002]; Hanyang University (HY-2019)
Language English
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