Improved Li-storage performance of CNTs-decorated LiVPO4F/C cathode material for electrochemical energy storage

Yang, Xiaojiao; Wang, Xianli; Wang, Kaiying; Chang, Guangli

doi:10.1016/j.ceramint.2017.11.168

Cited by 13 publications

(8 citation statements)

References 26 publications

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“…It can release a capacity of 128.4 and 125.6 mAh•g −1 even at 10C and 15C, respectively, which is nearly the maximum capacity according to the literature. 15,19,58,59 Its dropping speed of voltage platform is very slow and is as high as 4.10 and 3.95 V at 5C (Figure 3d) and 15C (Figure 3e), respectively. As far as we know, the rate performance (1C and 5C) of the LVPF/C-B 3 cathode may be the best in existing studies, 19,60−62 as shown in Figure S5, in which several excellent results and performances are shown.…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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)

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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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)

Zhang

Fan

et al. 2021

ACS Appl. Mater. Interfaces

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“…Figure 1a showed the XRD patterns of LiVPO 4 F/C [ 6 ] synthesized by using a one‐step solid‐state reaction under different conditions. The LiVPO 4 F/C phase begins to form at 550°C.…”

Section: Resultsmentioning

confidence: 99%

Effects of Fe doping on the electrochemical performance of LiV_1−xFe_xPO₄F/C (x = 0, 0.01, 0.02, 0.04) cathode materials for lithium‐ion batteries

Zhang

Jiang

et al. 2022

J Chinese Chemical Soc

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The Fe‐doped LiVPO4F/C cathode material was synthesized by a one‐step solid‐state reaction method. The effects of Fe doping content on the structure and electrochemical performance of LiVPO4F/C were investigated. X‐ray diffraction (XRD) analyses demonstrated that the appropriate addition of Fe3+ did not destroy the lattice structure of LiVPO4F/C. Scanning electron microscopy (SEM) showed that the surface of LiVPO4F/C is covered by a carbon film. The decreased grain size of the Fe‐doped LiVPO4F/C could shorten the ion transport path and thus improve the migration rate of lithium ions. X‐ray photoelectron spectroscopy (XPS) showed that the Fe ion exists in the Fe‐doped LiVPO4F/C as Fe3+ ion. At the discharge rate of 1 C, the initial discharge capacity and capacity retention rate of the LiV0.98Fe0.02PO4F/C after 500 cycles were 123.5 mAh/g and 88.6%, respectively.

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“…[ 84 ] CNT decorated LiVPO 4 F/C were synthesized using sol–gel synthesis route and a high reversible capacity of 121.1 mAh g −1 at 10 C rate was obtained. [ 85 ] Potassium doping into vanadium sites suppressed the formation of Li 3 V 2 (PO 4 ) 3 impurity and also reduced agglomerization leading to homogeneous distribution of particle size. [ 86 ] The K‐doped samples showed lower polarization, reduced charge transfer resistance and improved Li + diffusion coefficient when compared to the pristine LVPF as shown in Figure 3d.…”

Section: Fluorophosphatesmentioning

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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Improved Li-storage performance of CNTs-decorated LiVPO4F/C cathode material for electrochemical energy storage

Cited by 13 publications

References 26 publications

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

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

Effects of Fe doping on the electrochemical performance of LiV_1−xFe_xPO₄F/C (x = 0, 0.01, 0.02, 0.04) cathode materials for lithium‐ion batteries

Fluorophosphates: Next Generation Cathode Materials for Rechargeable Batteries

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Improved Li-storage performance of CNTs-decorated LiVPO4F/C cathode material for electrochemical energy storage

Cited by 13 publications

References 26 publications

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

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

Effects of Fe doping on the electrochemical performance of LiV1−xFexPO4F/C (x = 0, 0.01, 0.02, 0.04) cathode materials for lithium‐ion batteries

Fluorophosphates: Next Generation Cathode Materials for Rechargeable Batteries

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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)

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

Effects of Fe doping on the electrochemical performance of LiV_1−xFe_xPO₄F/C (x = 0, 0.01, 0.02, 0.04) cathode materials for lithium‐ion batteries