Prussian Blue Analogues with Optimized Crystal Plane Orientation and Low Crystal Defects toward 450â
Wh kg-1 Alkali-Ion Batteries.
Angew Chem Int Ed Engl
; 62(27): e202303953, 2023 Jul 03.
Article
em En
| MEDLINE
| ID: mdl-37118911
ABSTRACT
Prussian blue analogues (PBAs) have been regarded as promising cathode materials for alkali-ion batteries owing to their high theoretical energy density and low cost. However, the high water and vacancy content of PBAs lower their energy density and bring safety issues, impeding their large-scale application. Herein, a facile "potassium-ions assisted" strategy is proposed to synthesize highly crystallized PBAs. By manipulating the dominant crystal plane and suppressing vacancies, the as-prepared PBAs exhibit increased redox potential resulting in high energy density up to ≈450â
Wh kg-1 , which is at the same level of the well-known LiFePO4 cathodes for lithium-ion batteries. Remarkably, unconventional highly-reversible phase evolution and redox-active pairs were identified by multiple in situ techniques for the first time. The preferred guest-ion storage sites and migration mechanism were systematically analysed through theoretical calculations. We believe these results could inspire the design of safe with high energy density.
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MEDLINE
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En
Ano de publicação:
2023
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Article