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Issue 5, 2021
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Defect-free-induced Na+ disordering in electrode materials

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Abstract

For reaching high-performance of electrode materials, it is generally believed that understanding the structure evolution and heterogeneous alignment effect is the key. Presently, a very simple and universally applicable self-healing method is investigated to prepare defect-free Prussian blue analogs (PBAs) that reach their theoretical capacity as cathode materials for sodium-ion batteries (SIBs). For direct imaging of the local structure and the dynamic process at the atomic scale, we deliver a fast ion-conductive nickel-based PBA that enables rapid Na+ extraction/insertion within 3 minutes and a capacity retention of nearly 100% over 4000 cycles. This guest-ion disordered and quasi-zero-strain nonequilibrium solid–solution reaction mechanism provides an effective guarantee for realizing long-cycle life and high-rate capability electrode materials that operate via reversible two-phase transition reaction. Unconventional materials and mechanisms that enable reversible insertion/extraction of ions in low-cost metal–organic frameworks (MOFs) within minutes have implications for fast-charging devices, grid-scale energy storage applications, material discovery, and tailored modification.

Graphical abstract: Defect-free-induced Na+ disordering in electrode materials

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Supplementary files

Article information


Submitted
09 Jan 2021
Accepted
16 Mar 2021
First published
22 Mar 2021

Energy Environ. Sci., 2021,14, 3130-3140
Article type
Paper

Defect-free-induced Na+ disordering in electrode materials

J. Peng, M. Ou, H. Yi, X. Sun, Y. Zhang, B. Zhang, Y. Ding, F. Wang, S. Gu, C. A. López, W. Zhang, Y. Liu, J. Fang, P. Wei, Y. Li, L. Miao, J. Jiang, C. Fang, Q. Li, M. T. Fernández-Díaz, J. A. Alonso, S. Chou and J. Han, Energy Environ. Sci., 2021, 14, 3130
DOI: 10.1039/D1EE00087J

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