Unique crystallization behavior of sodium manganese pyrophosphate Na2MnP2O7 glass and its electrochemical properties

Tanabe, Morito; Honma, Tsuyoshi; Komatsu, Takayuki

doi:10.1016/j.jascer.2017.04.009

Cited by 21 publications

(10 citation statements)

References 44 publications

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“…Our research group has previously reported the synthesis of different active materials for LIBs [19][20][21][22][23][24][25][26] and SIBs [27][28][29][30][31][32][33] via the crystallisation of phosphate glass using a melting method. In general, the crystallisation of glass proceeds via a continuous process of crystal nucleation and growth from a homogeneous inorganic matrix 34,35 .…”

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confidence: 99%

Enhanced rate capabilities in a glass-ceramic-derived sodium all-solid-state battery

Yamauchi

Ikejiri

Tsunoda

et al. 2020

Sci Rep

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An all-solid-state battery (ASSB) with a new structure based on glass-ceramic that forms Na2FeP2O7 (NFP) crystals, which functions as an active cathode material, is fabricated by integrating it with a β″-alumina solid electrolyte. Two important factors that influence the rate capability of this ASSB were optimised. First, the particle size of the precursor glass powder from which the NFP crystals are formed was decreased. Consequently, the onset temperature of crystallisation shifts to a lower temperature, which enables the softening of NFP crystals and their integration with β″-alumina at a low temperature, without the interdiffusion of different crystal phases or atoms. Second, the interface between the β″-alumina solid electrolyte and cathode active materials which consisted of the NFP-crystallised glass and acetylene black used as a conductive additive, is increased to increase the insertion/release of ions and electrons from the active material during charge/discharge processes. Thus, the internal resistance of the battery is reduced considerably to 120 Ω. Thus, an ASSB capable of rapid charge/discharge that can operate not only at room temperature (30 °C) but also at −20 °C is obtained. This technology is an innovative breakthrough in oxide-based ASSBs, considering that the internal resistance of liquid electrolyte-based Li-ion batteries and sulphide-based ASSBs is ~10 Ω.

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confidence: 99%

Enhanced rate capabilities in a glass-ceramic-derived sodium all-solid-state battery

Yamauchi

Ikejiri

Tsunoda

et al. 2020

Sci Rep

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“…The substitution of Fe 2+ ions in the Na 2 FeP 2 O 7 crystal by Mn 2+ ions is effective for increasing the discharge voltage of the battery. In our previous study, the crystallization of Na 2 MnP 2 O 7 exhibits two different structural polymorphs so‐called metastable layered‐ (designated here as L‐) Na 2 MnP 2 O 7 and β‐Na 2 MnP 2 O 7 depend on the heat‐treatment temperature of the base glass . On the other hand, the crystallization of Na 2 FeP 2 O 7 only shows the formation of β‐phase.…”

Section: Introductionmentioning

confidence: 97%

“…In our previous study, the crystallization of Na 2 MnP 2 O 7 exhibits two different structural polymorphs so-called metastable layered-(designated here as L-) Na 2 MnP 2 O 7 and β-Na 2 MnP 2 O 7 depend on the heat-treatment temperature of the base glass. [21][22][23] On the other hand, the crystallization of Na 2 FeP 2 O 7 only shows the formation of β-phase. Tanabe clarified that the compositional limit of the formation of L-polymorph in the pseudo-binary system of xNa 2 MnP 2 O 7 -(1−x)Na 2 FeP 2 O 7 exists at x = 0.75.…”

Section: Introductionmentioning

confidence: 99%

Phase selective crystallization of Na₂Mn_0.9Fe_0.1P₂O₇ glass by laser irradiation

Honma

Kumagai

Komatsu

2019

Int J of Appl Glass Sci

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Laser‐induced crystallization was performed to form zero‐dimensional (dot) and one‐dimensional (line) patterns on the surface of Na2Mn0.9Fe0.1P2O7 glass. X‐ray diffraction patterns of crystallized‐glass prepared by conventional heat treatment suggests that the formation of β‐Na2MnxFe1−xP2O7 phase is more likely to form than layered‐ (L‐) Na2MnxFe1−xP2O7, which is the other metastable polymorph. Using the continuous wave (CW) laser‐induced crystallization technique, a demonstration of phase selective crystal patterning was confirmed in Na2Mn0.9Fe0.1P2O7 glass. Depending on the laser power (P), micro‐Raman spectroscopy of dot pattern suggest that three types of structural modifications, that is, softening, crystallization of L‐phase structure polymorph, β‐phase, and a mixture of L‐ and β‐phase, were induced. Meanwhile, the line patterning of Na2Mn0.9Fe0.1P2O7 showed a slow growth rate of 2 µm s−1. At P = 0.73 W, even when scanning was started from the β‐dot, the growth of the β‐line was disturbed by the formation of L‐phase but stable line growth of β‐phase occur at P = 0.76 W. Although the formation rate was also slow, laser irradiation is possible to form metastable polymorph selectively.

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“…Yamauchi et al [8,9] proposed a new prototype Na-ASSBs, in which Na 2 FeP 2 O 7 glass-ceramics and β-alumina solid solutions are used as cathode active materials and solid electrolytes, respectively. Na 2 FeP 2 O 7 glass and its derivative glassceramics exhibit viscous flows during the crystallization process and can be adhered to solid electrolytes at a low temperature of 500 • C without any external pressurization [10][11][12][13][14][15]. The battery's internal resistance was successfully reduced by optimizing the crystallization process of Na 2 FeP 2 O 7 glass, and the battery operation at −20 • C was demonstrated [9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Na+ Ion Conductivity of Stoichiometric Na3Zr2Si2PO12 by Liquid-Phase Sintering with NaPO3 Glass

Honma

Komatsu

2021

Materials

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Sodium super ionic conductor (NASICON)-type Na3Zr2Si2PO12 (NZSP) with the advantages of the high ionic conductivity, stability and safety is one of the most famous solid-state electrolytes. NZSP, however, requires the high sintering temperature about 1200 °C and long sintering time in the conventional solid-state reaction (SSR) method. In this study, the liquid-phase sintering (LPS) method was applied to synthesize NZSP with the use of NaPO3 glass with a low glass transition temperature of 292 °C. The formation of NZSP was confirmed by X-ray diffraction analyses in the samples obtained by the LPS method for the mixture of Na2ZrSi2O7, ZrO2, and NaPO3 glass. The sample sintered at 1000 °C for 10 h exhibited a higher Na+ ion conductivity of 1.81 mS/cm at 100 °C and a lower activation energy of 0.18 eV compared with the samples prepared by the SSR method. It is proposed that a new LPE method is effective for the synthesis of NZSP and the NaPO3 glass has a great contribution to the Na+ diffusion at the grain boundaries.

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Unique crystallization behavior of sodium manganese pyrophosphate Na₂MnP₂O₇ glass and its electrochemical properties

Cited by 21 publications

References 44 publications

Enhanced rate capabilities in a glass-ceramic-derived sodium all-solid-state battery

Enhanced rate capabilities in a glass-ceramic-derived sodium all-solid-state battery

Phase selective crystallization of Na₂Mn_0.9Fe_0.1P₂O₇ glass by laser irradiation

Synthesis and Na+ Ion Conductivity of Stoichiometric Na3Zr2Si2PO12 by Liquid-Phase Sintering with NaPO3 Glass

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Unique crystallization behavior of sodium manganese pyrophosphate Na2MnP2O7 glass and its electrochemical properties

Cited by 21 publications

References 44 publications

Enhanced rate capabilities in a glass-ceramic-derived sodium all-solid-state battery

Enhanced rate capabilities in a glass-ceramic-derived sodium all-solid-state battery

Phase selective crystallization of Na2Mn0.9Fe0.1P2O7 glass by laser irradiation

Synthesis and Na+ Ion Conductivity of Stoichiometric Na3Zr2Si2PO12 by Liquid-Phase Sintering with NaPO3 Glass

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Product

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Unique crystallization behavior of sodium manganese pyrophosphate Na₂MnP₂O₇ glass and its electrochemical properties

Phase selective crystallization of Na₂Mn_0.9Fe_0.1P₂O₇ glass by laser irradiation