Journal
NANO RESEARCH
Volume 10, Issue 4, Pages 1313-1321Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-016-1419-9
Keywords
potassium ion intercalation; potassium battery; MoS2; phase evolution; potassium ion diffusion
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Funding
- National Science Foundation [IIP-1542995]
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1542995] Funding Source: National Science Foundation
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Electrochemical potassium ion intercalation into two-dimensional layered MoS2 was studied for the first time for potential applications in the anode in potassium-based batteries. X-ray diffraction analysis indicated that an intercalated potassium compound, hexagonal K0.4MoS2, formed during the intercalation process. Despite the size of K+, MoS2 was a long-life host for repetitive potassium ion intercalation and de-intercalation with a capacity retention of 97.5% after 200 cycles. The diffusion coefficient of the K+ ions in KxMoS(2) was calculated based on the Randles-Sevcik equation. A higher K+ intercalation ratio not only encountered a much slower K+ diffusion rate in MoS2, but also induced MoS2 reduction. This study shows that metal dichalcogenides are promising potassium anode materials for emerging K-ion, K-O-2, and K-S batteries.
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