Nanotube-structured Na2V3O7 as a Cathode Material for Sodium-Ion Batteries with High-rate and Stable Cycle Performances

Tanibata, Naoto; Kondo, Yuki; Yamada, Shohei; Maeda, Masaki; Takeda, Hiromasa; Nakayama, Masanobu; Asaka, Toru; Kitajou, Ayuko; Okada, Shigeto

doi:10.1038/s41598-018-35608-9

Cited by 20 publications

(19 citation statements)

References 22 publications

(42 reference statements)

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“…Therefore, the high-throughput computational exploration partly succeeded in screening the Mg 2+ conductive oxides, though the evaluated migration energies obtained by BVFF calculations deviated significantly from those obtained by DFT-MD studies and experimental observations for Mg 0.6 Al 1.2 Si 1.8 O 6 . We infer that the present BVFF calculations may systematically overestimate the migration energy, as our previous study for Li ion conductors confirmed systematic overestimation compared to DFT-derived migration energies [23]. The trend of conduction values may be captured even for Mg-O systems, and quantitative improvement is required for the present high-throughput scheme.…”

Section: Discussionsupporting

confidence: 45%

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Novel Mg-ion conductive oxide of μ-cordierite Mg_0.6Al_1.2Si_1.8O₆

Takeda

Nakano

Tanibata

et al. 2020

Science and Technology of Advanced Materials

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Solid electrolytes with high Mg-ion conductivity are required to develop solid-state Mgion batteries. The migration energies of the Mg 2+ ions of 5,576 Mg compounds tabulated from the inorganic crystal structure database (ICSD) were evaluated via high-throughput calculations. Among the computational results, we focused on the Mg 2+ ion diffusion in Mg 0.6 Al 1.2 Si 1.8 O 6 , as this material showed a relatively low migration energy for Mg 2+ and was composed solely of ubiquitous elements. Furthermore, first-principles molecular dynamics calculations confirmed a single-phase Mg 2+ ion conductor. The bulk material with a single Mg 0.6 Al 1.2 Si 1.8 O 6 phase was successfully prepared using the sol-gel method. The relative density of the sample was 81%. AC impedance measurements indicated an electrical conductivity of 1.6 × 10 −6 Scm −1 at 500°C. The activation energy was 1.32 eV, which is comparable to that of monoclinic-type Mg 0.5 Zr 2 (PO 4) 3 .

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Section: Discussionsupporting

confidence: 45%

“…In this respect, we recently performed a high-throughput exhaustive search for fast ion conductors via automated material simulations, using the force field technique and percolation theory [22]. We demonstrated the effectiveness of novel high-rate electrodes comprising Na 2 V 3 O 7 as cathodes for Na-ion batteries [23].…”

Section: Introductionmentioning

confidence: 99%

Novel Mg-ion conductive oxide of μ-cordierite Mg_0.6Al_1.2Si_1.8O₆

Takeda

Nakano

Tanibata

et al. 2020

Science and Technology of Advanced Materials

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“…[74][75][76] Nevertheless, sodium cations have several advantages over lithium ones, and development is currently being intensively carried out to switch to sodium-ion polymer batteries. [77][78][79][80] The conductivities of lithium and sodium are comparable to a first approximation, 81 and this allows some comparisons. The ionic conductivity of the best solid polymer electrolytes based on blends of lithium salts with poly(p-phenylene) with attached flexible oligo(ethylene oxide) sidechains is about 10 -4.5 -10 −6 S cm -1 .…”

Section: Film Propertiesmentioning

confidence: 95%

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Ilyin

Yadykova

Makarova

et al. 2020

Polymer International

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Sulfonated poly(1,3,4-oxadiazole-2,5-diyl-1,4-phenyleneoxy-1,4-phenylene), poly(1,3,4-oxadiazole-2,5-diyl-10,10-dioxophenoxathiine-2,8-diyl) and their copolymers were one-pot synthesized in fuming sulfuric acid with the use of 4,4 0-oxydibenzoic acid and hydrazine sulfate as initial reagents. These copolymers were non-fusible and did not dissolve in individual liquids except sulfuric acid. However, it was possible to achieve their unlimited solubility using a mixed solvent that contained dimethyl sulfoxide, formamide and water. In dilute and semi-dilute solutions, the copolymers behaved like polyelectrolytes, while in concentrated solutions they formed gels; moreover, in the case of high polymer content, the gels were in a liquid crystalline state. The degree of sulfonation, temperature and water content in the mixed solvent influenced the state of copolymer solutions, their viscosity and viscoelasticity. The finding of the mixed solvent made it possible to form polymer films whose strength and heat resistance reached 33 MPa and 470°C, respectively. The ionic conductivity of the films under direct current conditions was 0.001-0.01 ∼S cm-1 for sodium cations and 0.3-1 mS cm-1 for protons.

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“…Na 2 V 3 O 7 was synthesized as reported in previous works. 31,32 The Na 2 V 3 O 7 electrode sheet was prepared by pasting a slurry made of Na 2 V 3 O 7 (80 wt%) mixed with Ketjen black (10 wt%, KB, Lion Corp.) and polyvinylidene fluoride (10 wt%, PVdF, Kureha) in N-methylpyrrolidone (NMP, Wako) onto Al foil using a 100 µm doctor blade and then dried at 60°C. The dried electrode sheets were punched into 12 mm diameter pieces and further dried overnight at 150°C (for hard carbon) or 120°C (for Na 2 V 3 O 7 ) in a vacuum.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte

et al. 2020

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Hard carbon is widely studied as a promising negative electrode in sodium-ion batteries. To achieve its stable charge-discharge reaction, a fluorine-rich passivation film arising from a fluorinated salt or solvent in an electrolyte was demonstrated to be effective, but its essential role remained unclear. Here, we report a sodium tetraphenylborate (NaBPh 4)/1,2-dimethoxyethane (DME) electrolyte that is free from fluorine but enables the highly stable and high-rate charge-discharge cycling of hard carbon electrodes as compared to other combinations of Na salts and solvents. Surface analysis of the cycled electrode shows that the NaBPh 4 is not decomposed during the cycle and that solid electrolyte interphase (SEI) is derived from DME. Hence, fluorine-based components are not indispensable to stabilize the hard carbon/electrolyte interface. The DME-derived SEI, though containing no F component, can highly stabilize the interface to enable the reversible and high-rate cycling of hard carbon.

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Nanotube-structured Na2V3O7 as a Cathode Material for Sodium-Ion Batteries with High-rate and Stable Cycle Performances

Cited by 20 publications

References 22 publications

Novel Mg-ion conductive oxide of μ-cordierite Mg_0.6Al_1.2Si_1.8O₆

Novel Mg-ion conductive oxide of μ-cordierite Mg_0.6Al_1.2Si_1.8O₆

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte

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Nanotube-structured Na2V3O7 as a Cathode Material for Sodium-Ion Batteries with High-rate and Stable Cycle Performances

Cited by 20 publications

References 22 publications

Novel Mg-ion conductive oxide of μ-cordierite Mg0.6Al1.2Si1.8O6

Novel Mg-ion conductive oxide of μ-cordierite Mg0.6Al1.2Si1.8O6

Sulfonated polyoxadiazole synthesis and processing into ion‐conducting films

Reversible and High-rate Hard Carbon Negative Electrodes in a Fluorine-free Sodium-salt Electrolyte

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Product

Resources

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Novel Mg-ion conductive oxide of μ-cordierite Mg_0.6Al_1.2Si_1.8O₆

Novel Mg-ion conductive oxide of μ-cordierite Mg_0.6Al_1.2Si_1.8O₆