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Summary: Due to their high theoretical specific capacity, long cycle life, abundant resources, and environmental benignity, iron-based Prussian blue analogues (PBAs) have been widely investigated as cathode materials for sodium-ion batteries (SIBs) in recent years. In this study, the reaction and capacity degradation mechanism of well-crystallized and shape-controlled monoclinic Prussian blue (M-PB) were thoroughly investigated. It was found that the high-spin (HS) Fe in M-PB reacts completely and contributes to most of the capacity, while only part of the low-spin (LS) Fe reacts. The partial reaction of LS Fe in M-PB is the reason for its excellent cycling performance.
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Summary: In this study, a Zn-K hybrid ion battery design is proposed, using a high-quality Prussian blue cathode and a nonflammable Zn-K hybrid ion electrolyte. The electrochemical process is divided into two parts, with K+ insertion/extraction occurring at the cathode side and Zn2+ plating/stripping occurring at the anode side. The hybrid cells demonstrate high capacity, high voltage, and an ultra-long cycle life, promising a bright future for renewable energy storage applications.
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Hang Zhang et al.
Summary: Prussian blue analogues (PBAs) have high theoretical energy density and low cost, but their high water and vacancy content lower the energy density and pose safety issues. A potassium-ions assisted strategy is proposed to synthesize highly crystallized PBAs, which exhibit increased redox potential and high energy density of approximately 450 Wh kg(-1). In addition, unconventional highly-reversible phase evolution and redox-active pairs were identified for the first time, and the preferred guest-ion storage sites and migration mechanism were systematically analyzed through theoretical calculations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
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Summary: In this study, a modified co-precipitation method was used to synthesize highly crystallized Prussian Blue analogs (PBAs). By introducing zinc as an electrochemical inert element to substitute high-spin iron, a highly reversible phase transition process for sustainable sodium-ion storage was achieved, resulting in improved cycle stability and specific capacity. In-situ tests confirmed minor lattice distortion and highly reversible phase transition of the zinc-substituted PBA during sodium-ion insertion and extraction, which greatly influenced the cycling stability. The zinc-substituted PBA exhibited remarkably enhanced cycling performance with a capacity retention of 58.5% over 2000 cycles at 150 mA g(-1) and superior rate performance up to 6000 mA g(-1).
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Journal of Energy Chemistry
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Min Wan et al.
Summary: This study proposes a new vacancy repairing strategy to synthesize high-quality FeHCF, which can significantly reduce the number of vacancy defects and reinforce the structure, thereby improving cycling stability and capacity activation.
NANO-MICRO LETTERS
(2022)
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Shipeng Zhang et al.
Summary: The Ni-Co-S@rGO nanocages were designed as anode materials for potassium-ion batteries, exhibiting excellent performance in reducing K+ diffusion length, improving reaction kinetics, and achieving high reversible capacity and low capacity degradation. Finite-element-simulation in situ characterizations revealed the unique structural advantages and electrochemical reaction mechanisms of Ni-Co-S@rGO, providing important guidance for designing high-performance energy-storage materials.
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Zeyu Wang et al.
Summary: This study successfully synthesized PBAs cathode materials with high reversibility and cycling stability by introducing ethylenediaminetetraacetic acid dipotassium salt as a chelating agent. The presence of FeIII vacancies inhibits the movement of Fe-C bonds and reduces lattice distortion, leading to improved performance of PBAs.
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NATURE COMMUNICATIONS
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