Synthesis and low temperature electrochemical properties of CeO2 and C co-modified Li3V2(PO4)3 cathode materials for lithium-ion batteries

Cai, Guojun; Yang, Yuexia; Guo, Ruisong; Zhang, Chao; Wu, Chuandong; Guo, Weina; Liu, Zhichao; Wan, Yizao; Jiang, Hong

doi:10.1016/j.electacta.2015.06.097

Cited by 30 publications

(18 citation statements)

References 43 publications

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“…The Fourier transform infrared (FT-IR) spectra were examined by Thermo Nicolet iS10 FT-IR spectrophotometer. Solid-state MAS NMR spectra of 7 Li and 31 P were obtained by a Bruker AVIII400WB NMR spectrometer at 9.4 T using a 1.3 mm HX probe with 1.3 mm zirconia rotors driven by dry air. The experimental conditions of NMR were similar to our previous work.…”

Section: Methodsmentioning

confidence: 99%

“…The local structural changes and the mechanism of Ti 4+ doping are studied by solid-state nuclear magnetic resonance (SSNMR). The 7 Li NMR spectra of LT x VP/C indicate that Ti 4+ doping effectively promotes the mobility of Li ions. The LT 0.08 VP/C sample demonstrates great rate performance (110 mAh/g at 10 C) and excellent cycling behavior (110.8 mAh/g at 10 C after 100 cycles).…”

Section: Introductionmentioning

confidence: 96%

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Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Wang

Huo

Lin

et al. 2019

ACS Appl. Energy Mater.

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The electrochemical properties of Li3V2(PO4)3 (LVP) cathode of lithium ion batteries are often improved by ion doping. Nevertheless, the mechanism of ion doping has not been fully understood. Here, Ti4+ has been chosen as a typical dopant with similar atomic radius to the six-coordinated V3+. A series of Li3Ti x V(2–x)(PO4)3/C samples are successfully synthesized by a sol–gel route. The 7Li MAS NMR spectra of the LT x VP/C demonstrate that the doping of Ti4+ can enhance the mobility of Li ions. The results of electrochemical properties tests show that moderate Ti4+ doping is able to improve the high rate capability of the materials by increasing the electronic conductivity and Li-ion diffusion coefficient. The optimal sample (LT0.08VP/C) exhibits the best cycling behavior and rate capability, which can deliver 110.85 mAh/g and capacity retention of 99.36% at 10 C after 100 cycles. Electrochemical impedance spectroscopy results indicate that LT0.08VP/C possesses the minimum charge transfer resistance. The calculation results of cyclic voltammetry illustrate that the Li-ion diffusion coefficient of LT0.08VP/C has been improved. By combining the information extracted from a series of electrochemical characterizations and NMR tests, a structural model of Li+ vacancy is proposed to explain the improving of Li+ mobility.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Wang

Huo

Lin

et al. 2019

ACS Appl. Energy Mater.

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“…[ 34–36 ] Metal oxides, with higher ionic conductivity, provide significant success in the formation of the coating layer. [ 37–39 ] In this regard, the atomic layer deposition (ALD) technique enables deposition of an ultrathin protective layer of few tens of Angstrom thickness as artificial CEI through cathode surface modification. Further, the ALD technique provides excellent control over the composition and thickness of the deposited film.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Engineering of Na₃V₂(PO₄)₂F₃ Hollow Spheres through Atomic Layer Deposition of TiO₂: Boosting Capacity and Mitigating Structural Instability

Sharabani

Taragin

Perelshtein

et al. 2021

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To mitigate the associated challenges of instability and capacity improvement in Na3V2(PO4)2F3 (NVPF), rationally designed uniformly distributed hollow spherical NVPF and coating the surface of NVPF with ultrathin (≈2 nm) amorphous TiO2 by atomic layer deposition is demonstrated. The coating facilitates higher mobility of the ion through the cathode electrolyte interphase (CEI) and enables higher capacity during cycling. The TiO2@NVPF exhibit discharge capacity of >120 mAhg−1, even at 1C rates, and show lower irreversible capacity in the first cycle. Further, nearly 100% capacity retention after rate performance in high current densities and 99.9% coulombic efficiency after prolonged cycling in high current density is reported. The improved performance in TiO2@NVPF is ascribed to the passivation behavior of TiO2 coating which protects the surface of NVPF from volume expansion, significantly less formation of carbonates, and decomposition of electrolyte, which is also validated through post cycling analysis. The study shows the importance of ultrathin surface protection artificial CEI for advanced sodium‐ion battery cathodes. The protection layer is diminishing parasitic reaction, which eventually enhances the Na ion participation in reaction and stabilizes the cathode structure.

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“…To overcome this problem, strenuous efforts have been devoted to improving the electronic conductivity of LVP, including lattice doping with metal ions [10,14,15,16,17], surface coating with carbon sources [18,19,20] or high electrical conductivity metal oxides [21,22,23], reducing particle size [24,25], and controlling particle morphologies [26,27,28]. Among these modified techniques, it is common to combine carbon with high electron conductivity and form Li 3 V 2 (PO 4 ) 3 /carbon (LVPC) composites.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Electrochemical Properties of Li3V2(PO4)3−xBrx/Carbon Composites as Cathode Materials for Lithium-Ion Batteries

Cao

Zhu

et al. 2017

Nanomaterials

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Li3V2(PO4)3−xBrx/carbon (x = 0.08, 0.14, 0.20, and 0.26) composites as cathode materials for lithium-ion batteries were prepared through partially substituting PO43− with Br−, via a rheological phase reaction method. The crystal structure and morphology of the as-prepared composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and electrochemical properties were evaluated by charge/discharge cycling and electrochemical impedance spectroscopy (EIS). XRD results reveal that the Li3V2(PO4)3−xBrx/carbon composites with solid solution phase are well crystallized and have the same monoclinic structure as the pristine Li3V2(PO4)3/carbon composite. It is indicated by SEM images that the Li3V2(PO4)3−xBrx/carbon composites possess large and irregular particles, with an increasing Br− content. Among the Li3V2(PO4)3−xBrx/carbon composites, the Li3V2(PO4)2.86Br0.14/carbon composite shows the highest initial discharge capacity of 178.33 mAh·g−1 at the current rate of 30 mA·g−1 in the voltage range of 4.8–3.0 V, and the discharge capacity of 139.66 mAh·g−1 remains after 100 charge/discharge cycles. Even if operated at the current rate of 90 mA·g−1, Li3V2(PO4)2.86Br0.14/carbon composite still releases the initial discharge capacity of 156.57 mAh·g−1, and the discharge capacity of 123.3 mAh·g−1 can be maintained after the same number of cycles, which is beyond the discharge capacity and cycleability of the pristine Li3V2(PO4)3/carbon composite. EIS results imply that the Li3V2(PO4)2.86Br0.14/carbon composite demonstrates a decreased charge transfer resistance and preserves a good interfacial compatibility between solid electrode and electrolyte solution, compared with the pristine Li3V2(PO4)3/carbon composite upon cycling.

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Synthesis and low temperature electrochemical properties of CeO2 and C co-modified Li3V2(PO4)3 cathode materials for lithium-ion batteries

Cited by 30 publications

References 43 publications

Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Interfacial Engineering of Na₃V₂(PO₄)₂F₃ Hollow Spheres through Atomic Layer Deposition of TiO₂: Boosting Capacity and Mitigating Structural Instability

Preparation and Electrochemical Properties of Li3V2(PO4)3−xBrx/Carbon Composites as Cathode Materials for Lithium-Ion Batteries

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Synthesis and low temperature electrochemical properties of CeO2 and C co-modified Li3V2(PO4)3 cathode materials for lithium-ion batteries

Cited by 30 publications

References 43 publications

Unraveling the Relationship between Ti4+ Doping and Li+ Mobility Enhancement in Ti4+ Doped Li3V2(PO4)3

Unraveling the Relationship between Ti4+ Doping and Li+ Mobility Enhancement in Ti4+ Doped Li3V2(PO4)3

Interfacial Engineering of Na3V2(PO4)2F3 Hollow Spheres through Atomic Layer Deposition of TiO2: Boosting Capacity and Mitigating Structural Instability

Preparation and Electrochemical Properties of Li3V2(PO4)3−xBrx/Carbon Composites as Cathode Materials for Lithium-Ion Batteries

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Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Unraveling the Relationship between Ti⁴⁺ Doping and Li⁺ Mobility Enhancement in Ti⁴⁺ Doped Li₃V₂(PO₄)₃

Interfacial Engineering of Na₃V₂(PO₄)₂F₃ Hollow Spheres through Atomic Layer Deposition of TiO₂: Boosting Capacity and Mitigating Structural Instability