2022
DOI: 10.1016/j.nanoen.2021.106680
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A novel Fe-defect induced pure-phase Na4Fe2.91(PO4)2P2O7 cathode material with high capacity and ultra-long lifetime for low-cost sodium-ion batteries

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Cited by 109 publications
(107 citation statements)
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“…No new peaks appeared during the whole process, indicating a reversible singlephase reaction mechanism as previously reported. [5,44] Of note, the SP/PAA-based electrode shows better stability, as the variation of (200) peak between the fully charged state and fully discharged state for the SP/PAA and PVDF-based electrode is 0.27° and 0.41° respectively. This verifies that the uniformly coated SP/PAA binder and the strong hydrogen-bonding interaction force can protect the NMFPP from side reactions and stabilize NMFPP, therefore resulting in the enhanced cycling stability.…”
Section: Resultsmentioning
confidence: 99%
“…No new peaks appeared during the whole process, indicating a reversible singlephase reaction mechanism as previously reported. [5,44] Of note, the SP/PAA-based electrode shows better stability, as the variation of (200) peak between the fully charged state and fully discharged state for the SP/PAA and PVDF-based electrode is 0.27° and 0.41° respectively. This verifies that the uniformly coated SP/PAA binder and the strong hydrogen-bonding interaction force can protect the NMFPP from side reactions and stabilize NMFPP, therefore resulting in the enhanced cycling stability.…”
Section: Resultsmentioning
confidence: 99%
“…The Fe‐defect induced pure phase Na 4 Fe 2.91 (PO 4 ) 2 P 2 O 7 material that recently reported by Cao's group offers us a possible route to synthesize pure IPBMs by defects engineering. [ 116 ] In addition to this, systematic investigation about the purity affecting factors and material formation process is of paramount important.…”
Section: Summary and Challengesmentioning
confidence: 99%
“…To further resolve the impurity problem, Cao et al presented a pure-phase Na 4 Fe 2.91 (PO 4 ) 2 P 2 O 7 material by bringing in a spot of Fe defects in the crystal lattice. [95] The DFT calculations show that the Fe defects could decrease the bandgap and Na + diffusion barrier energy. Hence, this simple Fe defects strategy could restrain the generation of impurity and improve electron and Na + conductivity by reducing the proportion of Fe.…”
Section: Development Of Electrochemical Performancementioning
confidence: 99%
“…[1][2][3] However, the higher redox potential of Na + /Na than that of Li + /Li (−2.71 V versus −3.04 V with reference to standard hydrogen electrode) and the much larger mass (23 g mol −1 versus 7 g mol −1 ) and ionic radius (1.02 Å versus 0.76 Å) of Na + than those of Li + usually lead to relatively low energy density, sluggish ion-diffusion kinetics, and detrimental electrode structural degradation of SIBs. [4][5][6] Generally, cathode material accounts for the largest proportion of the battery cost and plays a key role in determining the SIBs performance, [7] it is thereby of great significance to exploit promising high-specific-energy cathode materials with fast Na + diffusion channels and superior cycling stability.Currently, various cathode materials for SIBs have been reported, including layered transition-metal oxides, [8,9] polyanionic compounds, [10][11][12][13][14][15][16] and Prussian blue analogs, [17][18][19] etc. Among them, the polyanionic compounds have attracted extensive attention owing to their high working voltages and modest volume changes during the charge/discharge processes.…”
mentioning
confidence: 99%
“…Currently, various cathode materials for SIBs have been reported, including layered transition-metal oxides, [8,9] polyanionic compounds, [10][11][12][13][14][15][16] and Prussian blue analogs, [17][18][19] etc. Among them, the polyanionic compounds have attracted extensive attention owing to their high working voltages and modest volume changes during the charge/discharge processes.…”
mentioning
confidence: 99%