Polypyrrole-promoted superior cyclability and rate capability of Na<sub>x</sub>Fe[Fe(CN)<sub>6</sub>] cathodes for sodium-ion batteries

Tang, Yang; Zhang, Wuxing; Xue, Lihong; Ding, Xuli; Wang, Ting; Liu, Huan; Liu, Jing; Li, Xiaocheng; Huang, Yunhui

doi:10.1039/c6ta00876c

Cited by 113 publications

(83 citation statements)

References 37 publications

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“…The synthetic procedure of Na x MnFe(CN) 6 is illustrated in Figure . In order to eliminate the influence of defect contents and H 2 O contents but focus on the influence of intrinsic structure on the electrochemical performances of the Na x MnFe(CN) 6 , a large amount of trisodium citrate (15 g) are added in the synthesis process for all samples to reduce the crystallization rate, resulting in the products with low defects and low H 2 O contents . The Mn 2+ ions were first coordinated with citrate ions to form Mn 2+ ·citrate 3− chelate and then slowly coprecipitated with Fe(CN) 6 4− to form the target products.…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Manganese Hexacyanoferrate with Cubic Structure as Superior Cathode Material for Sodium‐Ion Batteries

Tang

Feng

et al. 2020

Adv Funct Materials

184

161

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Sodium manganese hexacyanoferrate (NaxMnFe(CN)6) is one of the most promising cathode materials for sodium‐ion batteries (SIBs) due to the high voltage and low cost. However, its cycling performance is limited by the multiple phase transitions during Na+ insertion/extraction. In this work, a facile strategy is developed to synthesize cubic and monoclinic structured NaxMnFe(CN)6, and their structure evolutions are investigated through in situ X‐ray diffraction (XRD), ex situ Raman, and X‐ray photoelectron spectroscopy (XPS) characterizations. It is revealed that the monoclinic phase undergoes undesirable multiple two‐phase reactions (monoclinic ↔ cubic ↔ tetragonal) due to the large lattice distortions caused by the Jahn–Teller effects of Mn3+, resulting in poor cycling performances with 38% capacity retention. The cubic NaxMnFe(CN)6 with high structural symmetry maintains the structural stability during the repeated Na+ insertion/extraction process, demonstrating impressive electrochemical performances with specific capacity of ≈120 mAh g−1 at 3.5 V (vs Na/Na+), capacity retention of ≈70% over 500 cycles at 200 mA g−1. In addition, the TiO2//C‐MnHCF full battery is fabricated with an energy density of 111 Wh kg−1, suggesting the great potential of cubic NaxMnFe(CN)6 for practical energy storage applications.

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Section: Resultsmentioning

confidence: 99%

High‐Performance Manganese Hexacyanoferrate with Cubic Structure as Superior Cathode Material for Sodium‐Ion Batteries

Tang

Feng

et al. 2020

Adv Funct Materials

184

161

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“…The ICE reaches 91.9% and then stays close to 100% from the 3rd cycle onwards. Moreover, full cells were assembled using Fe 7 Se 8 NRBs as the anode and Fe-HCF as the cathode in a mass ratio of 1:4.5, according to the synthetic procedure reported in a previous study [46] . The electrochemical performance of the home-made Fe-HCF is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Formation of hierarchical Fe7Se8 nanorod bundles with enhanced sodium storage properties

Tian

Feng

et al. 2020

Journal of Energy Chemistry

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“…Interestingly, for these PBAs, the cubic structure is still maintained. [34][35][36][37] Till date, there have been only two reports which have displayed a value of 1.6 ≤ x ≤ 2 in their general formula Na x M 1 M 2 (CN) 6 .nH 2 O, particularly with both M 1 and M 2 as Fe. Guo et al synthesized a Na richer Na 1.63 Fe 1.89 (CN) 6 with a rhombohedral crystal structure capable of delivering 153 mAh g −1 during its first charge (Na extraction process).…”

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confidence: 99%

“…[28][29][30][31][32][33][34][35][36][37][38] Goodenough et al synthesized Na rich PBAs with x ≈ 2 at an elevated temperature of 140…”

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confidence: 99%

Monoclinic Sodium Iron Hexacyanoferrate Cathode and Non-Flammable Glyme-Based Electrolyte for Inexpensive Sodium-Ion Batteries

Rudola

Balaya

2017

J. Electrochem. Soc.

103

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One of the key requirements of large-scale grid-storage systems is development of inexpensive and safe batteries. Sodium-ion batteries using earth-abundant Fe or Ti based cathodes and anodes would be ideal candidates for such storage systems. Herein, a new phase of Na-rich and all Fe Prussian Blue Analogue, monoclinic Na2Fe2(CN)6.2H2O, is reported as a potential cathode for such grid-storage sodium-ion batteries. This water-insoluble and air-stable cathode can deliver 85 mAh g−1 at an average discharge voltage of 3 V vs Na/Na+ with excellent cycle life (3,000 cycles). Many facets about its sodium storage characteristics are discussed with particular emphasis on the role of interstitial water on the sodium storage performance and its conversion to the dehydrated rhombohedral phase. Its compatibility with a newly developed non-flammable glyme-based liquid electrolyte, 1M NaBF4 in tetraglyme, is also disclosed along with general electrochemical and thermal characterization of this electrolyte for sodium-ion battery application. Finally, three different types of full cells are revealed with either monoclinic or rhombohedral phase as cathode and graphite or the recently reported Na2Ti3O7 ⇋ Na3-xTi3O7 pathway of Na2Ti3O7 as anode. Full cell energy densities of 70–90 Wh kg−1 (using cumulative cathode and anode weights) could be obtained without any pre-cycling steps. This new cathode and safe electrolyte may hold great promise toward development of inexpensive, non-flammable and highly stable grid-storage sodium-ion batteries.

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Polypyrrole-promoted superior cyclability and rate capability of Na_xFe[Fe(CN)₆] cathodes for sodium-ion batteries

Abstract: The Fe-HCF@PPy composite exhibits superior rate capability and improved cycling stability because of the effects from PPy as both an electronic conductor and a surface protective layer.

Cited by 113 publications

References 37 publications

High‐Performance Manganese Hexacyanoferrate with Cubic Structure as Superior Cathode Material for Sodium‐Ion Batteries

High‐Performance Manganese Hexacyanoferrate with Cubic Structure as Superior Cathode Material for Sodium‐Ion Batteries

Formation of hierarchical Fe7Se8 nanorod bundles with enhanced sodium storage properties

Monoclinic Sodium Iron Hexacyanoferrate Cathode and Non-Flammable Glyme-Based Electrolyte for Inexpensive Sodium-Ion Batteries

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Polypyrrole-promoted superior cyclability and rate capability of NaxFe[Fe(CN)6] cathodes for sodium-ion batteries

Abstract: The Fe-HCF@PPy composite exhibits superior rate capability and improved cycling stability because of the effects from PPy as both an electronic conductor and a surface protective layer.

Cited by 113 publications

References 37 publications

High‐Performance Manganese Hexacyanoferrate with Cubic Structure as Superior Cathode Material for Sodium‐Ion Batteries

High‐Performance Manganese Hexacyanoferrate with Cubic Structure as Superior Cathode Material for Sodium‐Ion Batteries

Formation of hierarchical Fe7Se8 nanorod bundles with enhanced sodium storage properties

Monoclinic Sodium Iron Hexacyanoferrate Cathode and Non-Flammable Glyme-Based Electrolyte for Inexpensive Sodium-Ion Batteries

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Polypyrrole-promoted superior cyclability and rate capability of Na_xFe[Fe(CN)₆] cathodes for sodium-ion batteries