Carbothermal reduction synthesis of carbon coated Na2FePO4F for lithium ion batteries

Cui, Dongming; Chen, Shasha; Han, Chang; Ai, Changchun; Yuan, Liangjie

doi:10.1016/j.jpowsour.2015.09.123

Cited by 39 publications

(51 citation statements)

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“…The obtained Na 2 FePO 4 F/C electrode exhibited high rate capability (66.8 mAh g −1 at 4.0 C) and superior capacity retention of 84.7% after 1000 cycles . A nano Na 2 FePO 4 F/reduced graphene oxide (rGO) composite can achieve a high capacity of 110 mAh g −1 at C/10 and display high‐rate capability of 60 mAh g −1 at 10 C . Through these pioneer studies, Na 2 FePO 4 F has made great progress in performance.…”

Section: Introductionmentioning

confidence: 99%

Highly Electrochemically‐Reversible Mesoporous Na₂FePO₄F/C as Cathode Material for High‐Performance Sodium‐Ion Batteries

Zhang

Zhou

Wang

et al. 2019

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As promising cathode materials, iron‐based phosphate compounds have attracted wide attention for sodium‐ion batteries due to their low cost and safety. Among them, sodium iron fluorophosphate (Na2FePO4F) is widely noted due to its layered structure and high operating voltage compared with NaFePO4. Here, a mesoporous Na2FePO4F@C (M‐NFPF@C) composite derived from mesoporous FePO4 is synthesized through a facile ball‐milling combined calcination method. Benefiting from the mesoporous structure and highly conductive carbon, the M‐NFPF@C material exhibits a high reversible capacity of 114 mAh g−1 at 0.1 C, excellent rate capability (42 mAh g−1 at 10 C), and good cycling performance (55% retention after 600 cycles at 5 C). The high plateau capacity obtained (>90% of total capacity) not only shows high electrochemical reversibility of the as‐prepared M‐NFPF@C but also provides high energy density, which mainly originates from its mesoporous structure derived from the mesoporous FePO4 precursor. The M‐NFPF@C serves as a promising cathode material with high performance and low cost for sodium‐ion batteries.

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Section: Introductionmentioning

confidence: 99%

Highly Electrochemically‐Reversible Mesoporous Na₂FePO₄F/C as Cathode Material for High‐Performance Sodium‐Ion Batteries

Zhang

Zhou

Wang

et al. 2019

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“…In the equivalent circuit, R s and R ct represent the equivalent ohmic resistance of the cell and charge transfer, respectively. Considering the surface of the working electrode is not absolutely smooth, CPE is used to describe the double layer capacitance, and W refers to Warburg impedance (Cui et al, 2016 ). As can be seen from Figure 5B , the equivalent ohmic resistance ( R s ) of these four Na 2 Fe 0.6 Mn 0.4 PO 4 F/C materials is similar, while the material prepared with ascorbic acid exhibits much lower charge-transfer resistance ( R ct ) than the other three synthesized materials, which indicates that the material prepared with ascorbic acid presents the lowest electrochemical polarization.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study on Na2Fe0.6Mn0.4PO4F/C Cathode Materials Synthesized With Various Carbon Sources for Na-ion Batteries

et al. 2021

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Na2Fe0.6Mn0.4PO4F/C composite materials are synthesized with various carbon sources via a simple spray-drying method in this study, and the effect of carbon sources on structure, morphology, and electrochemical properties of Na2Fe0.6Mn0.4PO4F/C materials are investigated in detail. XRD and SEM results indicate that the reduction ability of carbon sources has a key impact on the structure and morphology of Na2Fe0.6Mn0.4PO4F/C composite materials. Among these Na2Fe0.6Mn0.4PO4F/C materials, the sample prepared with ascorbic acid presents a uniform hollow spherical architecture. Electrochemical analysis demonstrates that the Na2Fe0.6Mn0.4PO4F/C sample prepared with ascorbic acid has optimal electrochemical performance. The sample shows high discharge capacities of 95.1 and 48.1 mAh g−1 at 0.05C and 1C rates, respectively, and it exhibits an improved cycle stability (91.7% retention after 100 cycles at 0.5C), which are superior to Na2Fe0.6Mn0.4PO4F/C materials prepared with other carbon sources. This study demonstrates that the reduction ability of carbon sources significantly influences the electrochemical properties of fluorophosphate/C composite materials. This work also provides a promising strategy to obtain high performance cathode materials for sodium-ion batteries.

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“…It has been observed that the particle size and morphology plays a key role in the electrochemistry of cathode materials, hence many synthesis methods for NFPF have been reported till date. [184][185][186][187][188][189][190][191][192][193][194][195] Deng et al reported a green route based synthesis technique where Vitamin C was used as a carbon source to yield Na 2 FePO 4 F/C. [192] They reported 84.7% of capacity retention at 4 C rate after 1000 cycles as shown in Figure 10a.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Fluorophosphates: Next Generation Cathode Materials for Rechargeable Batteries

Sharma

Adiga

Alshareef

et al. 2020

Advanced Energy Materials

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steadily depleting. These realities have triggered significant efforts to harness renewable energy sources like hydro, solar, geothermal, or tidal energy that are intermittent in nature. Economic and sustainable energy storage devices can be coupled with renewable energy generators to realize uninterrupted energy supply. In this sector, rechargeable batteries form the most viable energy storage devices. Today, lithium-ion batteries dominate the electronics market due to their high volumetric and specific energy density. [1-5] The manifold consumption of lithium resources due to the booming multibillion-dollar industry and limited global lithium reserves have raised concerns over the future supply of Li-based precursors to cater to the large scale production of lithium-ion batteries. To alleviate this issue, various alternatives using earth-abundant elements (e.g., monovalent Na + /K + and multivalent Mg 2+ /Ca 2+ /Al 3+) have been proposed to replace LIBs. [6-10] The energy density of batteries is limited by the performance of cathodes. Thus, over the last five decades, three major types of insertion materials have been examined as cathodes for secondary batteries: layered transition metal oxides, Mn-based spinels, and polyanion type materials (Figure 1a). 2D layered transition metal oxides have been extensively studied, but issues like oxygen loss at high potentials raise safety concerns and hence oxides like LiCoO 2 or LiNi 1−x−y Co x Mn y O 2 (x < 1, y < 1) are mainly limited to small portable electronics. Though oxides deliver high energy density, they have lower redox potentials due to highly covalent MO bonding character. [11] This issue can be evaded by implementing 3D polyanionic cathode materials with tuneable (high) redox potential along with structural/thermal stability leading to safe battery operation. [12,13] Plethora of insertion materials have been reported with different polyanionic subunits [(XO 4

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Carbothermal reduction synthesis of carbon coated Na2FePO4F for lithium ion batteries

Cited by 39 publications

References 30 publications

Highly Electrochemically‐Reversible Mesoporous Na₂FePO₄F/C as Cathode Material for High‐Performance Sodium‐Ion Batteries

Highly Electrochemically‐Reversible Mesoporous Na₂FePO₄F/C as Cathode Material for High‐Performance Sodium‐Ion Batteries

A Comparative Study on Na2Fe0.6Mn0.4PO4F/C Cathode Materials Synthesized With Various Carbon Sources for Na-ion Batteries

Fluorophosphates: Next Generation Cathode Materials for Rechargeable Batteries

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Carbothermal reduction synthesis of carbon coated Na2FePO4F for lithium ion batteries

Cited by 39 publications

References 30 publications

Highly Electrochemically‐Reversible Mesoporous Na2FePO4F/C as Cathode Material for High‐Performance Sodium‐Ion Batteries

Highly Electrochemically‐Reversible Mesoporous Na2FePO4F/C as Cathode Material for High‐Performance Sodium‐Ion Batteries

A Comparative Study on Na2Fe0.6Mn0.4PO4F/C Cathode Materials Synthesized With Various Carbon Sources for Na-ion Batteries

Fluorophosphates: Next Generation Cathode Materials for Rechargeable Batteries

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Highly Electrochemically‐Reversible Mesoporous Na₂FePO₄F/C as Cathode Material for High‐Performance Sodium‐Ion Batteries

Highly Electrochemically‐Reversible Mesoporous Na₂FePO₄F/C as Cathode Material for High‐Performance Sodium‐Ion Batteries