Integrated Structural Modulation Inducing Fast Charge Transfer in Aqueous Zinc-Ion Batteries.

Autor: Naresh N; Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, 52828, Republic of Korea., Park Y; Hydrogen Research Department, Korea Institute of Energy Research (KIER), 152 Gajeong-ro Yuseong-gu, Daejeon, 34129, Republic of Korea., Jeong SH; Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, 52828, Republic of Korea., Lee SJ; Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, 52828, Republic of Korea., Lee DP; Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, 52828, Republic of Korea., Lee SH; School of Materials Science and Engineering, Gyeongsang National University, Jinju, 52828, Republic of Korea., Ryu GH; Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, 52828, Republic of Korea.; School of Materials Science and Engineering, Gyeongsang National University, Jinju, 52828, Republic of Korea., Jung YH; PLS-II Beamline Division, Pohang Accelerator Laboratory (PAL), Pohang, 37673, Republic of Korea., Kim JH; Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, 52828, Republic of Korea.; School of Materials Science and Engineering, Gyeongsang National University, Jinju, 52828, Republic of Korea.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Nov; Vol. 20 (48), pp. e2406249. Date of Electronic Publication: 2024 Sep 02.
DOI: 10.1002/smll.202406249
Abstrakt: Aqueous Zn-ion batteries (AZIBs) are promising energy-storage devices owing to their exceptional safety, long cycle life, simple production, and high storage capacity. Manganese oxides are considered potential cathode materials for AZIBs, primarily because of their safety, low cost, simple synthesis, and high storage capacity. However, MnO 2 -based cathodes tend to deteriorate structurally during long-term cycling, which reduces their reversible capacity. In this study, an advanced α-MnO 2 @SnO 2 nanocomposite via facile hydrothermal synthesis is developed. The synergistic effects of lattice disorder and increased electron conductivity in the α-MnO 2 @SnO 2 nanocomposite mitigate structural degradation and enhance the overall electrochemical performance. The nanocomposite exhibits a high reversible capacity of 347 mAh g -1 at a current density of 100 mA g -1 after 50 cycles. Furthermore, it exhibits excellent rate performance and stable capacity even after 1000 cycles, maintaining a capacity of 78 mAh g -1 at a high current density of 5 A g -1 . This excellent electrochemical performance is attributed to the reversible Zn intercalation in α-MnO 2 @SnO 2 nanocomposites due to the increased structural stability and fast ion/electron exchange caused by the distortion of the tunnel structure, on the basis of various ex situ experiments, density functional theory calculations, and electrochemical characterizations.
(© 2024 The Author(s). Small published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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