Journal
CHEMISTRY OF MATERIALS
Volume 32, Issue 21, Pages 9147-9154Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.0c02308
Keywords
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Funding
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Science and ICT, Korea [2011-0031628]
- National Research Foundation of Korea [4120200413631] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Although electrode materials for batteries show high energy density, sluggish kinetics originated from the diffusion-controlled charge storage mechanism result in low power density and limit potential applications. Here, we report the synthesis of alkylammonium-intercalated mackinawite iron sulfides (M-FeS) as electrode materials for batteries. Well-defined layered structures with an interlayer distance controlled from 0.5 to 1.3 nm were formed by the intercalation of various alkylammonium ions into M-FeS, and the density of intercalated ions was controlled by varying the mass of the intercalated molecules, resulting in controlled electrochemical properties. M-FeS with increased interlayer distance and controlled density of intercalated molecules exhibited enhanced capacity, ion diffusion flux, rate capability, and structural stability. These improved electrochemical properties were explained by the effect of electrical conductivity, the density of intercalated molecules, diffusion coefficient, and concentration of electrolyte ions. This analysis suggests factors to consider when selecting two-dimensional materials and intercalants in order to enhance electrochemical performance.
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