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Article
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Summary: A self-templating strategy was used to prepare homogeneous P2-K0.6CoO2 (KCO) microcubes, which showed improved electrochemical properties for potassium storage due to the reduced interface between the electrolyte and the active material.
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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.
ADVANCED FUNCTIONAL MATERIALS
(2023)
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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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Hang Zhang et al.
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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(2023)
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Jian Peng et al.
Summary: In this study, the sodium storage properties of hexacyanoferrate (HCF) have been greatly improved by the high-entropy (HE) concept. The synthesis of a high-entropy HCF material has been achieved, demonstrating impressive cycling stability and fast-charging capability. The material also exhibits remarkable air stability and all-climate performance. Through multiple in situ techniques and density functional theory calculations, the reaction mechanism and sodium diffusion coefficient of the material have been measured and analyzed. This research provides new insights into the development of advanced electrodes and the tuning of electrochemical performance through atomic composition.
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Zhihao Chen et al.
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Journal of Energy Chemistry
(2023)
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Xianyong Wu et al.
Summary: Potassium-ion batteries have the potential for high capacity and exceptional cycling stability, but advancements are needed in electrode and electrolyte materials selection, as well as controlling coupled electrochemical reactions and ensuring compatibility between materials. Stability can be achieved by using a stable K2Mn[Fe(CN)(6)] cathode, prepotassiated graphite anode, and concentrated electrolyte, resulting in a high energy density and good cycling performance.
ADVANCED MATERIALS
(2022)
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Jian Peng et al.
Summary: In this study, a facile ice-assisted strategy was developed to prepare highly crystallized Prussian blue analogues (PBAs) as cathode materials for sodium-ion batteries. By suppressing structure defects, the resulting PBAs exhibited high capacity, long cycling lifespan, and significantly enhanced high/low temperature performance.
Article
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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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Chongwei Gao et al.
Summary: In this study, a Fe/Mn coexistent Prussian blue analogue (PBA) cathode material was developed, showing excellent cyclic stability and high average discharge voltage for potassium-ion batteries (PIBs), which provides a promising strategy for designing stable high-voltage PBAs.
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Summary: Weakening the cation-solvent interactions can effectively solve the problems in lithium-ion batteries, such as co-intercalation phenomena, inferior metal performance, and limited oxidation stability. This method enhances the performance and stability of electrolytes, graphite anodes, and potassium metal.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
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Summary: This study investigates a reversible solid-solid interfacial storage mechanism in ultrafine Prussian blue analogue/reduced graphene oxide through a job-sharing mechanism, which enhances battery performance.
ACS ENERGY LETTERS
(2022)
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Mingwei Jiang et al.
Summary: A balanced coordination principle is proposed to prepare low-defect Prussian blue materials for outstanding sodium energy storage. The high-crystalline open framework allows superfast and highly reversible sodium insertion/extraction. Remarkable capacity retention is achieved at high rates.
Article
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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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Fanfan Liu et al.
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Shuang-Jie Tan et al.
Summary: Functional cosolvents play an important role in improving the performance of lithium-ion batteries. This study proposes the use of a noncoordinating functional cosolvent that enriches the functionality of the electrolyte without interfering with the Li storage process. The application of this noncoordinating cosolvent has shown promising results in maintaining battery stability.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
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An Li et al.
Summary: Potassium manganese hexacyanoferrate (KMHCF) is a promising cathode material for potassium-ion batteries (PIBs) due to its impressive electrochemical performance, abundant elements, and easy synthesis. However, the capacity fading and poor K+ diffusion kinetics hinder its large-scale application. In this study, Mn-Ni Prussian blue analogue (MnNi-PBA) spheres were synthesized using a facile anion exchange method. The addition of Ni stabilizes the structure and provides rich active sites, leading to improved cycling performance and shorter ion diffusion pathways. The MnNi-PBA sphere cathode exhibits high initial discharge capacity, enhanced rate capability, and long cycle life. The reversible structural changes (monoclinic <-> cubic) of MnNi-PBA spheres are observed during cycling. These findings provide a design strategy for Mn-based Prussian blue analogues in PIBs.
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Summary: This review summarizes and discusses the electrochemical reaction mechanisms, challenges, and synthesis methods of metal sulfide (MS) anode materials for potassium-ion batteries (PIBs). By optimizing the synthesis methods, the problems encountered by MSs in PIBs can be solved, and an ideal architecture for high-performance PIBs can be constructed.
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Fan Feng et al.
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Leqing Deng et al.
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NATURE COMMUNICATIONS
(2021)
Review
Chemistry, Multidisciplinary
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Summary: Potassium-ion batteries (PIBs) are gaining research attention as an alternative energy storage system to lithium-ion batteries (LIBs) due to their advantage in potassium reserves. Finding suitable electrode materials, especially cathode materials that can withstand the serious structural deformation during continuous potassium intercalation/deintercalation, is crucial for stable electrochemical performance. The relationship between material lattice frameworks and performance is discussed, along with potential strategies for future development of PIBs.
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