A low-defect and Na-enriched Prussian blue lattice with ultralong cycle life for sodium-ion battery cathode

Yan, Changxiu; Zhao, Along; Zhong, Faping; Feng, Xiangming; Chen, Weihua; Qian, Jiangfeng; Ai, Xinping; Yang, Hanxi; Cao, Yong

doi:10.1016/j.electacta.2019.135533

Cited by 84 publications

(64 citation statements)

References 43 publications

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“…Yan et al compared precipitation of NaFeHCFs with addition of NaCl, mixed NaC/Na 3 CA and Na 3 CA with comparable Na + concentration, the latter resulted in most favorable crystallinity, stoichiometry and thus electrochemical performances. [ 116 ] Using a higher concentration of Na 3 CA (0.255 m ), a lower precipitation temperature (0 °C) and the PVP surfactant, Chen's group precipitated a monoclinic NaFeHCF showing a special border‐rich hierarchical morphology (Figure 9f,g). [ 32 ] Smaller cubes of ≈1 µm are found to stack together forming larger secondary particles of several micrometers with a high surface area.…”

Section: Crystallization Control For High‐quality Hcfsmentioning

confidence: 99%

Hexacyanoferrate‐Type Prussian Blue Analogs: Principles and Advances Toward High‐Performance Sodium and Potassium Ion Batteries

Zhou

Cheng

Wang

et al. 2020

Advanced Energy Materials

295

209

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Na‐ion batteries (NIBs) and K‐ion batteries (KIBs) are promising candidates for next‐generation electric energy storage applications due to their low costs and appreciable energy/power density compared to Li‐ion batteries. In the search for viable electrode materials for NIBs and KIBs, Prussian blue analogs (PBAs) with inherent rigid and open frameworks and large interstitial voids have shown an impressive ability to accommodate big alkali‐metal ions without structure collapse. In particular, hexacyanoferrates (HCFs) utilizing abundant Fe(CN)6 resources are the most interesting subgroup of PBAs, being able to deliver a specific capacity of 70–170 mAh g‒1 and a voltage of 2.5‒3.8 V in NIBs/KIBs. In this Review, a comprehensive discussion of the HCF‐type cathode materials in terms of their structural features, redox mechanisms, synthesis control, and modification strategies based on research advances over the last ten years. The methodologies and achievements in improving the material properties of HCFs including the compositional stoichiometry, crystal water, crystallinity, morphology, and electrical conductivity are outlined, with the aim to promote understanding of these materials and provide new insights into future design of PBAs for advanced rechargeable batteries.

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Section: Crystallization Control For High‐quality Hcfsmentioning

confidence: 99%

Hexacyanoferrate‐Type Prussian Blue Analogs: Principles and Advances Toward High‐Performance Sodium and Potassium Ion Batteries

Zhou

Cheng

Wang

et al. 2020

Advanced Energy Materials

295

209

View full text Add to dashboard Cite

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“…In the literature, most Prussian blue analogues (PBAs) exist with a range of different compositions in addition to variations of x, y , and n contents, leading to highly variable electrochemical performance even for the same compositional family. 7 − 10 Further variability originates from a wide spectrum of synthesis routes, evaluation procedures, and storage conditions. 11 In particular, the electrochemical performance is broadly accepted to be heavily affected by the presence of water.…”

Section: Introductionmentioning

confidence: 99%

“… 16 , 17 All of these detrimental effects will impede the battery’s practical application. 8 − 10 , 18 , 19 …”

Section: Introductionmentioning

confidence: 99%

Moisture-Driven Degradation Pathways in Prussian White Cathode Material for Sodium-Ion Batteries

Ojwang

Svensson

Njel

et al. 2021

ACS Appl. Mater. Interfaces

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The high-theoretical-capacity (∼170 mAh/g) Prussian white (PW), Na x Fe[Fe(CN) 6 ] y · n H 2 O, is one of the most promising candidates for Na-ion batteries on the cusp of commercialization. However, it has limitations such as high variability of reported stable practical capacity and cycling stability. A key factor that has been identified to affect the performance of PW is water content in the structure. However, the impact of airborne moisture exposure on the electrochemical performance of PW and the chemical mechanisms leading to performance decay have not yet been explored. Herein, we for the first time systematically studied the influence of humidity on the structural and electrochemical properties of monoclinic hydrated (M-PW) and rhombohedral dehydrated (R-PW) Prussian white. It is identified that moisture-driven capacity fading proceeds via two steps, first by sodium from the bulk material reacting with moisture at the surface to form sodium hydroxide and partial oxidation of Fe 2+ to Fe 3+ . The sodium hydroxide creates a basic environment at the surface of the PW particles, leading to decomposition to Na 4 [Fe(CN) 6 ] and iron oxides. Although the first process leads to loss of capacity, which can be reversed, the second stage of degradation is irreversible. Over time, both processes lead to the formation of a passivating surface layer, which prevents both reversible and irreversible capacity losses. This study thus presents a significant step toward understanding the large performance variations presented in the literature for PW. From this study, strategies aimed at limiting moisture-driven degradation can be designed and their efficacy assessed.

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“…Third, depending on synthesis conditions, PBA have a varying amount of structural vacancies. Many studies focus on minimizing the number of vacancies in PBA [20][21][22][23][24][25][26][27][28], while others suggest vacancies may play an important role in ion conduction and structural stability [4]. Whether a certain amount of vacancies is desirable or not may be influenced by the choice of intercalation ion and which electrolyte is used.…”

Section: Introductionmentioning

confidence: 99%

Strategies for synthesis of Prussian blue analogues

et al. 2021

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We report a comparison of different common synthetic strategies for preparation of Prussian blue analogues (PBA). PBA are promising as cathode material for a number of different battery types, including K-ion and Na-ion batteries with both aqueous and non-aqueous electrolytes. PBA exhibit a significant degree of structural variation. The structure of the PBA determines the electrochemical performance, and it is, therefore, important to understand how synthesis parameters affect the structure of the obtained product. PBA are often synthesized by co-precipitation of a metal salt and a hexacyanoferrate complex, and parameters such as concentration and oxidation state of the precursors, flow rate, temperature and additional salts can all potentially affect the structure of the product. Here, we report 12 different syntheses and compare the structure of the obtained PBA materials.

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A low-defect and Na-enriched Prussian blue lattice with ultralong cycle life for sodium-ion battery cathode

Cited by 84 publications

References 43 publications

Hexacyanoferrate‐Type Prussian Blue Analogs: Principles and Advances Toward High‐Performance Sodium and Potassium Ion Batteries

Hexacyanoferrate‐Type Prussian Blue Analogs: Principles and Advances Toward High‐Performance Sodium and Potassium Ion Batteries

Moisture-Driven Degradation Pathways in Prussian White Cathode Material for Sodium-Ion Batteries

Strategies for synthesis of Prussian blue analogues

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