Layered K0.28MnO2·0.15H2O as a Cathode Material for Potassium-Ion Intercalation
- Authors
- Jo, Jae Hyeon; Hwang, Jang Yeon; Choi, Jiung; Sun, Yang-Kook; Myung, Seung-Taek
- Issue Date
- Nov-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- K-ion battery; cathode; layered-type; high capacity; operando XRD
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.11, no.46, pp.43312 - 43319
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 11
- Number
- 46
- Start Page
- 43312
- End Page
- 43319
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2126
- DOI
- 10.1021/acsami.9b18540
- ISSN
- 1944-8244
- Abstract
- Here, we present K0.28MnO2·0.15H2O, which has a two-dimensional open framework, as an intercalation host for potassium ions. K0.28MnO2·0.15H2O has a layered structure consisting of edge-sharing MnO6 octahedra with a large basal spacing of ∼7.3 Å, 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 K0.28MnO2·0.15H2O 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.
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