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.
Original language | English |
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Pages (from-to) | 3130-3140 |
Number of pages | 11 |
Journal | Energy and Environmental Science |
Volume | 14 |
Issue number | 5 |
DOIs | |
State | Published - May 2021 |
Funding
J. H. thanks the National Natural Science Foundation of China (Grant No. 51772117 and 51732005) and the National Key R&D Program of China (Grant No. 2016YFB0100302) for financial support. We thank the Analytical and Testing Centre and the State Key Laboratory of Materials Processing and Die & Mould Technology of HUST for the material characterization. J. A. A. acknowledges the financial support given by the Spanish Ministry of Economy and Competitiveness to the project MAT2017-84496-R. X. S. thanks the National Natural Science Foundation of China (Grant No. 11905081). We are grateful to ILL (Grenoble, France) for providing the neutron beam time.