A three-dimensional LiVPO4F@C/MWCNTs/rGO composite with enhanced performance for high rate Li-ion batteries

Hu, Guorong; Gan, Zhanggen; Cao, Yanbing; Du, Ke; Du, Yao; Peng, Zhongdong

doi:10.1016/j.electacta.2018.09.142

Cited by 19 publications

(11 citation statements)

References 42 publications

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“…This can be tuned through the inductive effect introduced by the V 3+/4+ couple (~4.28 V [6,7]) to form LiFe 1− x V x PO 4 F (0 ≤ x ≤ 1) solid solutions. Here we noticed that the specific capacity of LiVPO 4 F is almost the same as that of LiFePO 4 F (151.6 vs. 155.9 mAh g −1 ), and the specific energy of LiVPO 4 F [8,9,10,11,12,13,14,15,16,17,18,19,20] is larger than that of LiFePO 4 F [4,21,22,23] (667 vs. 424 Wh kg −1 ).…”

Section: Introductionmentioning

confidence: 78%

Structure, Shift in Redox Potential and Li-Ion Diffusion Behavior in Tavorite LiFe1−xVxPO4F Solid-Solution Cathodes

et al. 2019

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Solid-solution Li-ion cathode materials transform through a single-phase reaction thus leading to a long-term structural stability and improved cyclability. In this work, a two- to single-phase Li+-extraction/insertion mechanism is studied through tuning the stoichiometry of transition-metal Fe/V cations to trigger a transition in the chemical reactivity path. Tavorite triclinic-structured LiFe1−xVxPO4F (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) solid-solution powders were prepared by a facile one-step solid-state method from hydrothermal-synthesized and commercial raw materials. The broad shape of cyclic voltammetry (CV) peaks, sloping charge/discharge profiles and sloping open-circuit voltage (OCV) profiles were observed in LiFe1−xVxPO4F solid-solution cathodes while 0 < x < 1. These confirm strongly a single-phase behavior which is different from the two-phase behavior in the end-members (x = 0 or 1). The electronegativity of M (M = Fe1−xVx) for the redox potential of Fe2+/3+ couple or the M–O4F2 bond length for the V3+/4+ couple plays respectively a dominant role in LiFe1−xVxPO4F solid-solution cathodes.

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Section: Introductionmentioning

confidence: 78%

Structure, Shift in Redox Potential and Li-Ion Diffusion Behavior in Tavorite LiFe1−xVxPO4F Solid-Solution Cathodes

et al. 2019

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“…The Nyquist plots of all samples consist of a depressed semicircle at high frequency and a straight line at low frequency. They correspond to the solid electrolyte interfacial film and charge-transfer resistance ( R sf + R ct ) and the solid-state diffusion ( W o ) of ions in the LiVPO 4 F/C material according to the literature. , The plots are fitted according to the inserted equivalent circuit diagram, and the fitting results are listed in Table . It can be seen that the R ct value of the undoped LVPF/C-B 0 sample is higher than that of B-doped LiVPO 4 F/C-B x samples.…”

Section: Resultsmentioning

confidence: 99%

“…Coating of a conductive material is the main method to improve the electrochemical performance of the LiVPO 4 F cathode. The coating effects of carbon nanotubes, , acetylene black, , graphene, − and silver on the surface of LiVPO 4 F have been investigated. However, most of the above coating materials are very expensive, and it is infeasible in potential industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Construction and Theoretical Calculation of an Ultra-High-Performance LiVPO₄F/C Cathode by B-Doped Pyrolytic Carbon from Poly(vinylidene Fluoride)

Zhang

Fan

et al. 2021

ACS Appl. Mater. Interfaces

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B-doped pyrolytic carbon from poly(vinylidene fluoride) (PVDF) was used to enhance the performance of a LiVPO 4 F/C cathode, which is much cheaper than carbon nanotubes and graphene. The carbon layer in LVPF/C-B 3 becomes more and more regular compared with the undoped sample. The electronic conductivity, diffusion coefficient, and rate and cycle performance of the B-doped cathode are greatly improved. The capacities of LVPF/C-B 3 at 0.2C, 5C, and 15C are 148.1, 132.9, and 125.6 mAh•g −1 , which may be the best reported magnitude. The crystallite structure of LiVPO 4 F/C is well maintained after 300 charge and discharge cycles. The carbonization process of PVDF is greatly accelerated. These improvements are attributed to the changes in chemical and electronic structures. The generation of BC 2 O and BCO 2 results in many defective active sites, and BC 3 promotes the growth of a six-membered carbon ring. According to the first-principles approach based on density functional theory, the state density around the Fermi level of the B-doped pyrolytic carbon is increased. The electronic structure of pyrolytic carbon is transformed from a P-type semiconductor to a metal-like structure through the generation of pyridinic-like and graphitic-like B. Therefore, the electronic conductivity of LiVPO 4 F/C is increased.

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“…In comparison to the 1D and 2D structures, 3D structure offers rational design and creates novel architecture tailor-made for enhancing the electrochemical performance of batteries [113]. The capability of architectural hierarchical porous structures with 3D configuration leads to the effective performance in energy storage devices by simultaneously enhancing the ion-accessible surface area and ion diffusion [113,114]. Compared to 2D materials, the 3D porous carbons have many advantages.…”

Section: Three-dimensional Hierarchical Carbonmentioning

confidence: 99%

Nanocarbon in Sodium‐ion Batteries – A Review. Part 2: One, Two, and Three‐dimensional Nanocarbons

2023

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Nanocarbons play a significant role in the development of alternative, clean and sustainable energy technologies. The utility of low‐dimensional nanostructured carbons (one‐, two‐ and three‐dimensional) in the new generation of batteries have shown great potential due to their physicochemical and electrochemical properties as well as high safety. The electrodes made from nanostructured carbon materials with different dimensions, size and structures offer enhanced ionic transport and electronic conductivity as compared to conventional batteries. They also enable the occupation of all intercalation sites available in the particle which leads to high specific capacities, fast ion diffusion, superior rate capability and long‐term cyclability. The carbonaceous nanosized active materials are important to enhance the electrical conductivity of the electrode materials and buffer the structural change and strain during sodium insertion and extraction. Application potentialities of different low‐dimensional nanostructured carbons in sodium‐ion batteries (SIBs) are discussed in this part II. It also deals with the modifications made on the carbonaceous material by doping with heteroatoms, expressing diversified morphologies with porous materials or compositing with organic or inorganic species.

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A three-dimensional LiVPO4F@C/MWCNTs/rGO composite with enhanced performance for high rate Li-ion batteries

Cited by 19 publications

References 42 publications

Structure, Shift in Redox Potential and Li-Ion Diffusion Behavior in Tavorite LiFe1−xVxPO4F Solid-Solution Cathodes

Structure, Shift in Redox Potential and Li-Ion Diffusion Behavior in Tavorite LiFe1−xVxPO4F Solid-Solution Cathodes

Construction and Theoretical Calculation of an Ultra-High-Performance LiVPO₄F/C Cathode by B-Doped Pyrolytic Carbon from Poly(vinylidene Fluoride)

Nanocarbon in Sodium‐ion Batteries – A Review. Part 2: One, Two, and Three‐dimensional Nanocarbons

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A three-dimensional LiVPO4F@C/MWCNTs/rGO composite with enhanced performance for high rate Li-ion batteries

Cited by 19 publications

References 42 publications

Structure, Shift in Redox Potential and Li-Ion Diffusion Behavior in Tavorite LiFe1−xVxPO4F Solid-Solution Cathodes

Structure, Shift in Redox Potential and Li-Ion Diffusion Behavior in Tavorite LiFe1−xVxPO4F Solid-Solution Cathodes

Construction and Theoretical Calculation of an Ultra-High-Performance LiVPO4F/C Cathode by B-Doped Pyrolytic Carbon from Poly(vinylidene Fluoride)

Nanocarbon in Sodium‐ion Batteries – A Review. Part 2: One, Two, and Three‐dimensional Nanocarbons

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Construction and Theoretical Calculation of an Ultra-High-Performance LiVPO₄F/C Cathode by B-Doped Pyrolytic Carbon from Poly(vinylidene Fluoride)