Highly Crystallized Prussian Blue with Enhanced Kinetics for Highly Efficient Sodium Storage

Qin, Mingsheng; Ren, Wenhao; Jiang, Ruixuan; Li, Qi; Yao, Xuhui; Wang, Shiqi; You, Ya; Mai, Liqiang

doi:10.1021/acsami.0c20067

Cited by 142 publications

(112 citation statements)

References 47 publications

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“…This phenomenon has been explained in other studies [6]. The electronic supplementary material, figure S12 summarized the difference of PB produced by this work and others work reported [7,[23][24][25][26][27][28][29][30][31].…”

Section: Resultssupporting

confidence: 84%

In situ polyaniline coating of Prussian blue as cathode material for sodium-ion battery

et al. 2021

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Prussian blue (PB) has great potential for use as a sodium cathode material owing to its high working potential and cube frame structure. Herein, this work reports a two-step method to synthesize PB with ascorbic acid as the ball-milling additive, which improves the electrochemical rate performance of PB during the traditional co-precipitation method. The obtained PB sample exhibited a superior specific capability (113.3 mAh g −1 even at 20 C, 1 C = 170 mA g −1 ) and a specific capacity retention of 84.8% after 100 cycles at 1 C rate. In order to enhance the cycling performance of the PB, an in situ polyaniline coating strategy was employed in which aniline was added into the electrolyte and polymerized under electrochemical conditions. The coated anode exhibited a high specific capacity retention of 62.7% after 500 cycles, which is significantly higher than that of the non-coated sample, which only remains 40.1% after 500 cycles. This development has shown a great potential as a low-cost, high-performance and environment-friendly technology for large-scale industrial application of PB.

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Section: Resultssupporting

confidence: 84%

In situ polyaniline coating of Prussian blue as cathode material for sodium-ion battery

et al. 2021

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“…Such high specific capacity and rate performance is competitive with other reported hexacyanoferrate cathodes (Fig. S7) [ 13 , 18 , 20 , 21 , 34 – 37 ].…”

Section: Resultsmentioning

confidence: 47%

“…During the first charge process, the FeHCF-I electrode maintains a cubic phase and the diffraction planes of (200) and (220) gradually shifts to higher angles, indicating the decreasing lattice parameters caused by the continuous extraction of Na + . While in the first discharge process, a new diffraction peak appears at 23.5° at 2.7 V, corresponding to the peak splits of the (220) plane to the (220) and (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) planes. This also indicates a phase transformation from cubic to rhombohedral.…”

Section: In-situ Vacancy Repairing Strategymentioning

confidence: 99%

“…Nevertheless, large amounts of Fe(CN) 6 vacancies can be formed in the solution synthesis of FeHCF owing to the rapid precipitation process. These lattice defects with coordinated water can not only break the structural integrity and reduce the active Na + storage sites, but can also cause a structural collapse during the charge–discharge process, leading to deterioration of the electrochemical performance [ 9 – 13 ]. To overcome this issue, most research focuses on reducing the crystallization rate, resulting in a lower vacancy content in the framework [ 14 – 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Post-Synthetic and In Situ Vacancy Repairing of Iron Hexacyanoferrate Toward Highly Stable Cathodes for Sodium-Ion Batteries

et al. 2021

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Iron hexacyanoferrate (FeHCF) is a promising cathode material for sodium-ion batteries. However, FeHCF always suffers from a poor cycling stability, which is closely related to the abundant vacancy defects in its framework. Herein, post-synthetic and in-situ vacancy repairing strategies are proposed for the synthesis of high-quality FeHCF in a highly concentrated Na4Fe(CN)6 solution. Both the post-synthetic and in-situ vacancy repaired FeHCF products (FeHCF-P and FeHCF-I) show the significant decrease in the number of vacancy defects and the reinforced structure, which can suppress the side reactions and activate the capacity from low-spin Fe in FeHCF. In particular, FeHCF-P delivers a reversible discharge capacity of 131 mAh g−1 at 1 C and remains 109 mAh g−1 after 500 cycles, with a capacity retention of 83%. FeHCF-I can deliver a high discharge capacity of 158.5 mAh g−1 at 1 C. Even at 10 C, the FeHCF-I electrode still maintains a discharge specific capacity of 103 mAh g−1 and retains 75% after 800 cycles. This work provides a new vacancy repairing strategy for the solution synthesis of high-quality FeHCF.

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“…Energy storage is a crucial step toward a sustainable society. While lithium-ion batteries have been in use for many years, 1 researchers are beginning to search for other sustainable alternatives. 2 Sodium-ion batteries are thus drawing attention due to the high abundance and availability of the element on earth.…”

Section: Introductionmentioning

confidence: 99%

Ladder Mechanisms of Ion Transport in Prussian Blue Analogues

Nordstrand

Toledo-Carrillo

Vafakhah

et al. 2021

ACS Appl. Mater. Interfaces

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Prussian blue (PB) and its analogues (PBAs) are drawing attention as promising materials for sodium-ion batteries and other applications, such as desalination of water. Because of the possibilities to explore many analogous materials with engineered, defect-rich environments, computational optimization of ion-transport mechanisms that are key to the device performance could facilitate real-world applications. In this work, we have applied a multiscale approach involving quantum chemistry, self-consistent mean-field theory, and finite-element modeling to investigate ion transport in PBAs. We identify a cyanide-mediated ladder mechanism as the primary process of ion transport. Defects are found to be impermissible to diffusion, and a random distribution model accurately predicts the impact of defect concentrations. Notably, the inclusion of intermediary local minima in the models is key for predicting a realistic diffusion constant. Furthermore, the intermediary landscape is found to be an essential difference between both the intercalating species and the type of cation doping in PBAs. We also show that the ladder mechanism, when employed in multiscale computations, properly predicts the macroscopic charging performance based on atomistic results. In conclusion, the findings in this work may suggest the guiding principles for the design of new and effective PBAs for different applications.

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Highly Crystallized Prussian Blue with Enhanced Kinetics for Highly Efficient Sodium Storage

Cited by 142 publications

References 47 publications

In situ polyaniline coating of Prussian blue as cathode material for sodium-ion battery

In situ polyaniline coating of Prussian blue as cathode material for sodium-ion battery

Post-Synthetic and In Situ Vacancy Repairing of Iron Hexacyanoferrate Toward Highly Stable Cathodes for Sodium-Ion Batteries

Ladder Mechanisms of Ion Transport in Prussian Blue Analogues

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