Highly conductive cathode materials for Li-ion batteries prepared by thermal nanocrystallization of selected oxide glasses

Pietrzak, Tomasz K.; Wasiucionek, M.; Michalski, Przemysław P.; Kaleta, Anna; Garbarczyk, Jerzy E.

doi:10.1016/j.mseb.2016.05.008

Cited by 27 publications

(22 citation statements)

References 39 publications

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“…One can see that glasses as well as nanomaterials containing vanadium (especially VV and TV) exhibited the highest values of electrical conductivity among other compounds studied in this work. This observation is consistent with our previous investigations (eg, ). In contrast, glasses and nanomaterials containing iron (FV and FT) exhibited lower conductivity.…”

Section: Resultssupporting

confidence: 94%

“…In recent years, the other way to the conductivity enhancement has been proposed and investigated by our group — a thermal nanocrystallization of glassy analogs of the important crystalline cathode materials, such as: V 2 O 5 and LiFePO 4 . Our method consists of only two stages: (a) glass preparation by melt quenching and (b) thermal treatment of the glass leading to its nanocrystallization. We demonstrated that by the appropriately chosen heat‐treatment conditions, a giant (even by a factor 10 9 ) and irreversible conductivity enhancement can be obtained.…”

Section: Introductionmentioning

confidence: 91%

“…Our method consists of only two stages 14,15 : (a) glass preparation by melt quenching and (b) thermal treatment of the glass leading to its nanocrystallization. We demonstrated that by the appropriately chosen heat-treatment conditions, a giant (even by a factor 10 9 ) and irreversible conductivity enhancement can be obtained.…”

mentioning

confidence: 99%

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Syntheses and nanocrystallization of NaF–M₂O₃–P₂O₅ NASICON‐like phosphate glasses (M = V, Ti, Fe)

Pietrzak

Kruk-Fura

Mikołajczuk

et al. 2019

Int J of Appl Glass Sci

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Six NASICON‐type phosphate glasses with a wide variety of compositions (Na3M2(PO4)2F3, where M2 = V2, Ti2, Fe2, TiV, FeV, and FeTi) were synthesized using melt‐quenching and double‐crucible techniques. Their glass transition and crystallization temperatures were determined from differential thermal analysis experiments. The electrical properties were studied with impedance spectroscopy. We found that depending on temperature and composition the studied materials exhibit predominant electronic, ionic, or mixed conduction. This observation is interesting from both fundamental and application point of view (eg, in all‐solid‐state batteries). In general, the conductivity of glasses ranged from 3·10−13 to 10−10 S/cm at room temperature, with activation energies varying from 0.65 to 0.73 eV. After crystallization at 600°C, the values of conductivity noticeably increased. For nanocrystalline materials, they were between 10−11 and 10−7 S/cm (at room temperature). The values of the activation energy spread from 0.53 to 0.70 eV. Most of the glasses exhibited predominant electronic conductivity. After nanocrystallization, the ionic transference number considerably increased in almost all samples. This study proves that thermal nanocrystallization can be used to synthesize nanocrystalline NASICON‐like cathode materials for Na‐ion batteries from their glassy analogs. We believe that this method can be adopted also to other interesting sodium compounds in the future.

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Section: Resultssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 91%

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Syntheses and nanocrystallization of NaF–M₂O₃–P₂O₅ NASICON‐like phosphate glasses (M = V, Ti, Fe)

Pietrzak

Kruk-Fura

Mikołajczuk

et al. 2019

Int J of Appl Glass Sci

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“…Conductivity value for initial glassy sample was marked with red dashed line energy as a result of thermal nanocrystallisation was broadly discussed by us (e.g. in [1]) on a base of the Mott's theory of electron hopping in oxide glasses containing transition metal oxides [23]. In Fig.…”

Section: Impedance Spectroscopymentioning

confidence: 92%

“…Recently, an interesting way to enhance electrical conductivity of such materials has been proposed [1,2] namely thermal nanocrystallisation of glassy analogues of cathode materials for lithium-and sodium-ion batteries. This method was successfully applied to vitreous V 2 O 5 -P 2 O 5 [3], Li 2 O-FeO-V 2 O 5 -P 2 O 5 [4,5], LiF-V 2 O 5 -P 2 O 5 , Li 2 O-FeO-B 2 O 3 [6] and some other systems, usually resulting in a giant increase in the electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, thermal, structural and electrical properties of vanadium-doped lithium-manganese-borate glass and nanocomposites

Jarocka

Michalski

Ryl

et al. 2019

Ionics

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A glassy sample with a nominal formula LiMn 1−3x/2 V x BO 3 (where x = 0.05) was synthesised using the melt-quenching method. Material was characterised by differential thermal analysis (DTA), X-ray diffactometry (XRD) at room temperature and as a function of temperature (HT-XRD), X-ray photoelectron spectroscopy (XPS), impedance spectroscopy (IS) and scanning electron microscopy (SEM). Dependences of glass transition and crystallisation temperatures on the heating rate in DTA experiments were determined. The initial value of electrical conductivity of the glass was 1.4 × 10 −15 Scm −1. It was significantly increased by a proper thermal nanocrystallisation. The maximum value was higher by 6 orders of magnitude and reached 2.6 × 10 −9 Scm −1 at room temperature. Expected crystalline phases (i.e. monoclinic and hexagonal LiMnBO 3) upon heating were identified and assigned to thermal events observed with DTA. Microstructure of nanocrystalline samples observed by SEM revealed nanocrystalline grains noticeably smaller than 100 nm. Results explaining nanocrystallisation process are coherent.

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Correlation between Nanostructural and Enhanced Electrical Conductivity of Annealed 30V₂O₅–20Bi₂O₃–50P₂O₅ Glass

Hannora

El‐Desoky

2020

Crystal Research and Technology

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Structural and DC conductivity of annealed 30V 2 O 5-20Bi 2 O 3-50P 2 O 5 traditional quenching melt glass is investigated. The as quenched with amorphous nature and crystallized formed phases of annealed samples are confirmed by X-ray diffraction and differential scanning calorimeter (DSC) techniques. The average crystallite size of the present samples after crystallization at different temperatures and times is estimated to be about 47-74.9 nm. DSC analyses of the glasses indicate a prominent glass transition temperature at 669.9 K. Monoclinic bismuth phosphate phase is formed after annealing at 723 K for 2 h and completely disappeared at 923 K with the formation of orthorhombic vanadium phosphorus oxide and new bismuth phosphate monoclinic phase. The conductivity is discussed in conformity with Mott's theory. The crystallinity development reduces the grain boundaries which leads to the conductivity improvement.

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Highly conductive cathode materials for Li-ion batteries prepared by thermal nanocrystallization of selected oxide glasses

Cited by 27 publications

References 39 publications

Syntheses and nanocrystallization of NaF–M₂O₃–P₂O₅ NASICON‐like phosphate glasses (M = V, Ti, Fe)

Syntheses and nanocrystallization of NaF–M₂O₃–P₂O₅ NASICON‐like phosphate glasses (M = V, Ti, Fe)

Synthesis, thermal, structural and electrical properties of vanadium-doped lithium-manganese-borate glass and nanocomposites

Correlation between Nanostructural and Enhanced Electrical Conductivity of Annealed 30V₂O₅–20Bi₂O₃–50P₂O₅ Glass

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Highly conductive cathode materials for Li-ion batteries prepared by thermal nanocrystallization of selected oxide glasses

Cited by 27 publications

References 39 publications

Syntheses and nanocrystallization of NaF–M2O3–P2O5 NASICON‐like phosphate glasses (M = V, Ti, Fe)

Syntheses and nanocrystallization of NaF–M2O3–P2O5 NASICON‐like phosphate glasses (M = V, Ti, Fe)

Synthesis, thermal, structural and electrical properties of vanadium-doped lithium-manganese-borate glass and nanocomposites

Correlation between Nanostructural and Enhanced Electrical Conductivity of Annealed 30V2O5–20Bi2O3–50P2O5 Glass

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Product

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Syntheses and nanocrystallization of NaF–M₂O₃–P₂O₅ NASICON‐like phosphate glasses (M = V, Ti, Fe)

Syntheses and nanocrystallization of NaF–M₂O₃–P₂O₅ NASICON‐like phosphate glasses (M = V, Ti, Fe)

Correlation between Nanostructural and Enhanced Electrical Conductivity of Annealed 30V₂O₅–20Bi₂O₃–50P₂O₅ Glass