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Layered K0.28MnO2·0.15H2O as a Cathode Material for Potassium-Ion Intercalation

Title
Layered K0.28MnO2·0.15H2O as a Cathode Material for Potassium-Ion Intercalation
Author
황장연
Keywords
K-ion battery; cathode; layered-type; high capacity; operando XRD
Issue Date
2019-11
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v. 11, no. 46, Page. 43312-43319
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.
URI
https://pubs.acs.org/doi/10.1021/acsami.9b18540https://repository.hanyang.ac.kr/handle/20.500.11754/154340
ISSN
1944-8244; 1944-8252
DOI
10.1021/acsami.9b18540
Appears in Collections:
CENTER FOR CREATIVE CONVERGENCE EDUCATION[S](창의융합교육원) > ETC
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