Preventing structural degradation from Na3V2(PO4)3 to V2(PO4)3: F-doped Na3V2(PO4)3/C cathode composite with stable lifetime for sodium ion batteries

Chen, Yanjun; Xu, Youlong; Sun, Xiaofei; Zhang, Baofeng; He, Shengnan; Li, Long; Wang, Chao

doi:10.1016/j.jpowsour.2017.12.073

Cited by 72 publications

(35 citation statements)

References 50 publications

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“…01-085-2265), which shows the crystal structure did not change with F doping. The enlargement indicates the peak (113) shifts slightly and gradually to the larger angle as F content increases, suggesting the F-doped samples have fewer lattice parameters, which comports with the Rietveld refinement results. , …”

Section: Resultssupporting

confidence: 80%

“…The enlargement indicates the peak (113) shifts slightly and gradually to the larger angle as F content increases, suggesting the F-doped samples have fewer lattice parameters, which comports with the Rietveld refinement results. 21,24 We took Raman measurements of the NTP-F x /C composites. Figure S2a shows the Raman spectra of the pristine NTP/C and NTP-F 0.05 /C.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In addition, anion doping is a flexible choice to improve kinetics and structural stability. Fluorine doping is widely used in electrodes to improve electrochemical properties. − All of this encouraged us to fabricate NTP with fluorine doping.…”

Section: Introductionmentioning

confidence: 99%

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F-Doped NaTi₂(PO₄)₃/C Nanocomposite as a High-Performance Anode for Sodium-Ion Batteries

Wei

Liu

et al. 2018

ACS Appl. Mater. Interfaces

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We are presenting a sol−gel method for building novel nanostructures made of nanosized F-doped Na 1−2x Ti 2 (PO 4 ) 3−x F x (NTP-F x , x = 0, 0.02, 0.05, and 0.10) particles embedded in threedimensional (3D) carbon matrices (NTP-F x /C). This technique combines advantages of both zero-dimensional materials and 3Dcarbon networks. Proper fluorine doping stabilizes the NTP structure and greatly enhances ion/electron transportation, leading to superhighrate electrochemical performance and ultralong cycle life. The composite electrode delivers high specific capacities of 121, 115, 112.2, 110.1, 107.7, 103.1, 85.8, and 62.5 mA h g −1 at 0.2, 0.5, 1, 2, 5, 10, 20, and 30 C, respectively. It retains an unbelievable ∼70% capacity after a thousand cycles at a rate as high as 10 C. Electroanalytical results reveal that fluorine doping significantly enhances Na + diffusion kinetics. Meanwhile, density functional theory calculations demonstrate F-doped NTPs' own outstanding electrochemical properties, which is due to the enhanced intrinsic ionic/electronic conductivity. The results show that anion doping is an efficient way to make high-performance NTP anodes for sodium-ion batteries. KEYWORDS: sodium-ion batteries, NaTi 2 (PO 4 ) 3 , anion doping, F doping, sodium-ion full cell

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Section: Resultssupporting

confidence: 80%

Section: ■ Results and Discussionmentioning

confidence: 99%

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F-Doped NaTi₂(PO₄)₃/C Nanocomposite as a High-Performance Anode for Sodium-Ion Batteries

Wei

Liu

et al. 2018

ACS Appl. Mater. Interfaces

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“…Figure b illustrates the FTIR spectra of the NVP and NVP/C samples. The band at 632 cm −1 is attributed to the vibration of V 3+ −O 2− bonds in VO 6 octahedra, while the bands at 1084 cm −1 , 1054 cm −1 and 580 cm −1 are assigned to the stretching vibration of P−O bonds in PO 4 units. Similar XRD and FTIR patterns of NVP and NVP/C samples suggest that carbon coating does not affect the structural properties of NVP.…”

Section: Resultsmentioning

confidence: 81%

Carbon Nanolayer‐Coated Na₃V₂(PO₄)₃ Nanocrystals Embedded in Conductive Carbon Matrix as High‐Performance Cathode for Sodium‐Ion Batteries

et al. 2018

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Na3V2(PO4)3 is a promising cathode material for sodium‐ion batteries. However, the design of appropriate carbon coatings is necessary for improving the Na‐storage performance of this material to overcome the intrinsically low electron conductivity and therefore sluggish reaction kinetics. Herein, carbon nanolayer‐coated Na3V2(PO4)3 nanocrystals embedded in a conductive carbon matrix (NVP/C) are fabricated by using a facile in‐situ synthesis method with controlled utilization of graphene‐oxide nanosheets. Structural and electrochemical properties of the as‐synthesized NVP/C material are analyzed by combining X‐ray diffraction, Fourier‐transform infrared spectroscopy, scanning electron microscope, transition electron microscope, and electrochemical measurements. The optimized NVP/C material exhibits a unique nanostructure consisting of Na3V2(PO4)3 nanocrystals with an average size of ∼60 nm and carbon nanolayers with uniform thickness of ∼5 nm. As electrode, the material delivers a high reversible capacity of 114.8 mAh g−1 at 0.2 C, superior high‐rate capability with a discharge capacity of 101.8 mAh g−1 at 10 C, and excellent cycling performance with capacity retention of 91 % after 1000 cycles. The finding indicates that constructing carbon‐coating nanolayers and a conductive carbon matrix is an important strategy to achieve high‐quality NVP/C material for advanced sodium‐ion batteries.

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“…Furthermore, the large volume change during the sodium insertion/deinsertion process greatly deteriorates its cycling stability. In order to address these issues, different methods such as carbon coating [27–34] or metal ion doping [33,35–40] have been practiced. For example, by dispersing NVP in acetylene carbon nanospheres, Li et al [41] .…”

Section: Introductionmentioning

confidence: 99%

Butanol Promoting High Graphitization in Carbon‐Supported Na₃V₂(PO₄)₃ for High‐Power Sodium‐Ion Battery with Long Life Cycle

Dong

Xiao

et al. 2021

ChemElectroChem

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Na3V2(PO4)3 (NVP) is an attractive cathode material for sodium storage because of its NASICON structure with high ionic conductivity and stability. However, its poor electronic conductivity and large volume change have limited its intensive application. Here, we use 1‐butanol as a co‐solvent to synthesize NVP (bNVP) microparticles with a uniform carbon coating layer. We discovered that butanol can effectively improve the graphitization level of the carbon, giving rise to a much higher electronic conductivity compared to the sample synthesized without butanol (pristine NVP, pNVP). As expected, bNVP demonstrates high reversible capacities of 110.3 mAh g−1 at 1 C, superior high‐rate performance of 98 mAh g−1 at 10 C, and enhanced cycling stability of 94 % capacity retention after 3500 cycles at 30 C, which are far better than pNVP, exhibiting great potential for high‐power sodium‐ion batteries.

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Preventing structural degradation from Na3V2(PO4)3 to V2(PO4)3: F-doped Na3V2(PO4)3/C cathode composite with stable lifetime for sodium ion batteries

Cited by 72 publications

References 50 publications

F-Doped NaTi₂(PO₄)₃/C Nanocomposite as a High-Performance Anode for Sodium-Ion Batteries

F-Doped NaTi₂(PO₄)₃/C Nanocomposite as a High-Performance Anode for Sodium-Ion Batteries

Carbon Nanolayer‐Coated Na₃V₂(PO₄)₃ Nanocrystals Embedded in Conductive Carbon Matrix as High‐Performance Cathode for Sodium‐Ion Batteries

Butanol Promoting High Graphitization in Carbon‐Supported Na₃V₂(PO₄)₃ for High‐Power Sodium‐Ion Battery with Long Life Cycle

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Preventing structural degradation from Na3V2(PO4)3 to V2(PO4)3: F-doped Na3V2(PO4)3/C cathode composite with stable lifetime for sodium ion batteries

Cited by 72 publications

References 50 publications

F-Doped NaTi2(PO4)3/C Nanocomposite as a High-Performance Anode for Sodium-Ion Batteries

F-Doped NaTi2(PO4)3/C Nanocomposite as a High-Performance Anode for Sodium-Ion Batteries

Carbon Nanolayer‐Coated Na3V2(PO4)3 Nanocrystals Embedded in Conductive Carbon Matrix as High‐Performance Cathode for Sodium‐Ion Batteries

Butanol Promoting High Graphitization in Carbon‐Supported Na3V2(PO4)3 for High‐Power Sodium‐Ion Battery with Long Life Cycle

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Product

Resources

About

F-Doped NaTi₂(PO₄)₃/C Nanocomposite as a High-Performance Anode for Sodium-Ion Batteries

F-Doped NaTi₂(PO₄)₃/C Nanocomposite as a High-Performance Anode for Sodium-Ion Batteries

Carbon Nanolayer‐Coated Na₃V₂(PO₄)₃ Nanocrystals Embedded in Conductive Carbon Matrix as High‐Performance Cathode for Sodium‐Ion Batteries

Butanol Promoting High Graphitization in Carbon‐Supported Na₃V₂(PO₄)₃ for High‐Power Sodium‐Ion Battery with Long Life Cycle