Exfoliation and restacking route to Keggin-Al-treated layered ruthenium oxide for enhanced lithium ion storage performance

• Published in: New journal of chemistry Vol. 48; no. 6; pp. 2381 - 2388
• Main Authors: Lee, Minseop, Park, Ji-Ho, Paek, Seung-Min
• Format: Journal Article
• Published: 05.02.2024
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d3nj05138b

Owing to their unique molecular structure and chemical reactivity, Keggin-Al 13 ([AlO 4 Al 12 (OH) 24 (H 2 O) 12 ] 7+ ) ions demonstrate versatility in various chemical reactions. Herein, ruthenium oxide nanosheets are introduced as a promising host material for the intercalation of Keggin-Al 13 ions with the aim to enhance electrochemical energy storage. Ruthenium oxide, known for its high energy density as an anode material in lithium-ion batteries, faces limitations in terms of cycling stability caused by volume expansion during lithiation. To address these limitations, an approach involving the intercalation of Keggin-Al 13 ions into ruthenium oxide nanosheets is developed. The resulting Al 13 -treated RuO 2 (AR-150), heated at 150 °C, maintained the increased interlayer spacing, compared to that of the pristine layered ruthenium oxide. The AR-150 consisting of restacked nanosheets exhibits a considerably increased pseudocapacitance contribution (83.8% at 0.8 mV s −1 ). In addition, the expanded lamellar structure of AR-150 effectively mitigates volume expansion during repeated lithiation, demonstrating impressive cycling stability. It maintains a reversible capacity of 379.0 mA h g −1 with a capacity retention of 75.0% after 120 cycles at 100 mA g −1 . This strategy based on the intercalation chemistry utilizes the unique properties of ruthenium oxide nanosheets to advance their applications in electrochemical energy storage. Ruthenium oxide nanosheets were used as hosts for the Keggin-Al 13 . The synthesized AR-150 has stable cycling performance as an anode material for lithium-ion batteries.