Synthesis and characterization of carbon-modified Li2MnP2O7/C composites prepared by spray pyrolysis

Jang, Heechan; Koji, Miyasaka; Taniguchi, Izumi

doi:10.1007/s10853-018-2219-2

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…In these compounds, the theoretical capacity would reach more than 200 mA h g –1 . For Li 2 FeP 2 O 7 , Li 2 MnP 2 O 7 , and Li 2– x CoP 2 O 7 cathodes, although they exhibited a high average voltage of 3.5, 4.3, and 4.9 V, respectively, capacities remained very low (<110 mA h g –1 ). − Zhou from Whittingham's group explored Li 2 VP 2 O 7 by synthesizing it via solid-state reaction and a wet chemical method . Upon examination, they claimed that the pure phase of Li 2 VP 2 O 7 may not be easily obtainable.…”

Section: Introductionmentioning

confidence: 99%

Lithium Vanadium Polyanionic Composite Multielectron Intercalation Cathode Derived from Thermodynamically Unstable Li₂VP₂O₇/Li₂VP₂O₇F

Lokeswararao

Viji

Budumuru

et al. 2022

ACS Appl. Energy Mater.

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LiVP 2 O 7 is a well-explored cathode that supports reversible single electron extraction with a theoretical capacity of 115 mA h g −1 . Hypothetical Li 2 VP 2 O 7 F or Li 2 VP 2 O 7 compounds, with an additional Li and F in the structure or Li with vanadium in the lower oxidation state V 2+ , are expected to exchange two moles of lithium from the cathode. Li 2 VP 2 O 7 F synthesis is attempted through a sol−gel process to explore the possibility of such multielectron cathode material. Several syntheses with final annealing at 800 °C in the Ar or N 2 /H 2 (95:5) resulted in compounds exhibiting identical X-ray diffraction (XRD) patterns. However, none of these compositions has any significant fluorine content in them. Surprisingly, sol−gel synthesis of the nominal composition, i.e., Li 2 VP 2 O 7 , without any F addition in the initial precursor also resulted in a similar XRD pattern. These XRD patterns are comparable to the ones reported in the literature for Li 2 VP 2 O 7 composition. Interestingly, we find that neither the Li 2 VP 2 O 7 F nor Li 2 VP 2 O 7 compound is thermodynamically stable. Rather, it forms roughly an equimolar structural mixture of three different phases, viz., Li 9 V 3 (P 2 O 7 ) 3 (PO 4 ) 2 , Li 3 V 2 (PO 4 ) 3 , and LiVP 2 O 7 , as discerned from the detailed structural studies performed using X-ray diffraction, Rietveld refinement, and chemical composition analysis performed using proton-induced γ-ray emission and proton elastic backscattering spectrometry. The electrochemical studies, interestingly, exhibit two reversible redox processes with nearly flat potential and an average voltage of 3.86 and 1.72 V. A very high first cycle capacity of ∼340 mA h g −1 is reported for the first time. The capacity related to second Li fades upon cycling, providing a net capacity of ∼200 mA h g −1 . The nominal composition of Li 2 VP 2 O 7 F synthesized in N 2 /H 2 (95:5) gas flow exhibited the best electrochemical properties for a single lithium intercalation reaction. KEYWORDS: lithium-ion battery, Li 2 VP 2 O 7 F and Li 2 VP 2 O 7 cathodes, sol−gel method, multielectron intercalation, electrochemical properties

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Section: Introductionmentioning

confidence: 99%

Lithium Vanadium Polyanionic Composite Multielectron Intercalation Cathode Derived from Thermodynamically Unstable Li₂VP₂O₇/Li₂VP₂O₇F

Lokeswararao

Viji

Budumuru

et al. 2022

ACS Appl. Energy Mater.

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Effect of temperature on ultrasonic spray pyrolysis method in zinc tungstate: The relationship between structural and optical properties

Santiago

Tranquilin

Li³

et al. 2021

Materials Chemistry and Physics

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Synthesis and characterization of carbon-modified Li2MnP2O7/C composites prepared by spray pyrolysis

Cited by 2 publications

References 27 publications

Lithium Vanadium Polyanionic Composite Multielectron Intercalation Cathode Derived from Thermodynamically Unstable Li₂VP₂O₇/Li₂VP₂O₇F

Lithium Vanadium Polyanionic Composite Multielectron Intercalation Cathode Derived from Thermodynamically Unstable Li₂VP₂O₇/Li₂VP₂O₇F

Effect of temperature on ultrasonic spray pyrolysis method in zinc tungstate: The relationship between structural and optical properties

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Synthesis and characterization of carbon-modified Li2MnP2O7/C composites prepared by spray pyrolysis

Cited by 2 publications

References 27 publications

Lithium Vanadium Polyanionic Composite Multielectron Intercalation Cathode Derived from Thermodynamically Unstable Li2VP2O7/Li2VP2O7F

Lithium Vanadium Polyanionic Composite Multielectron Intercalation Cathode Derived from Thermodynamically Unstable Li2VP2O7/Li2VP2O7F

Effect of temperature on ultrasonic spray pyrolysis method in zinc tungstate: The relationship between structural and optical properties

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Lithium Vanadium Polyanionic Composite Multielectron Intercalation Cathode Derived from Thermodynamically Unstable Li₂VP₂O₇/Li₂VP₂O₇F

Lithium Vanadium Polyanionic Composite Multielectron Intercalation Cathode Derived from Thermodynamically Unstable Li₂VP₂O₇/Li₂VP₂O₇F