Cathode properties of Na3M2(PO4) 2F3 [M = Ti, Fe, V] for sodium-ion batteries

Kuniko Chihara; Ayuko Kitajou; Irina D. Gocheva; Shigeto Okada; Jun Ichi Yamaki

doi:10.1016/j.jpowsour.2012.10.034

Cathode properties of Na₃M₂(PO₄) ₂F₃ [M = Ti, Fe, V] for sodium-ion batteries

Kuniko Chihara, Ayuko Kitajou, Irina D. Gocheva, Shigeto Okada, Jun Ichi Yamaki

Department of Advanced Device Materials

Research output: Contribution to journal › Article › peer-review

178 Citations (Scopus)

Abstract

The compounds Na₃M₂(PO₄)₂F ₃ [M = Ti, Fe, V] were obtained by two-step solid-state synthesis, and its electrochemical properties as cathode active materials of sodium-ion batteries were investigated. The obtained Na₃M₂(PO ₄)₂F₃ materials were found to have a tetragonal structure with a space group, P4₂/mnm, and were isostructural with β-Na₃V₂(PO₄)₂F₃ by X-ray powder diffraction (XRD) measurements. Within this series, Na ₃V₂(PO₄)₂F₃ in particular exhibited stability on cycling and a capacity of approximately 120 mAh g ^-1 against sodium metal. Capacity retention for this compound was 98%, even after the 40th cycle of prolonged charge/discharge measurements. Ex-situ XRD data for Na₃V₂(PO₄) ₂F₃ electrodes charged and discharged at selected voltages showed that the material structure expanded along the c axis during charging up to 4.3 V and returned to its original dimensions after cycling. This is attributed to the extraction/insertion of Na atoms layers along the (002) a-b plane in the tetragonal structure.

Original language	English
Pages (from-to)	80-85
Number of pages	6
Journal	Journal of Power Sources
Volume	227
DOIs	https://doi.org/10.1016/j.jpowsour.2012.10.034
Publication status	Published - 2013

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2012.10.034

Cite this

@article{5ff93e5943d14219a1bfdfd89d4bdb4a,

title = "Cathode properties of Na3M2(PO4) 2F3 [M = Ti, Fe, V] for sodium-ion batteries",

abstract = "The compounds Na3M2(PO4)2F 3 [M = Ti, Fe, V] were obtained by two-step solid-state synthesis, and its electrochemical properties as cathode active materials of sodium-ion batteries were investigated. The obtained Na3M2(PO 4)2F3 materials were found to have a tetragonal structure with a space group, P42/mnm, and were isostructural with β-Na3V2(PO4)2F3 by X-ray powder diffraction (XRD) measurements. Within this series, Na 3V2(PO4)2F3 in particular exhibited stability on cycling and a capacity of approximately 120 mAh g -1 against sodium metal. Capacity retention for this compound was 98%, even after the 40th cycle of prolonged charge/discharge measurements. Ex-situ XRD data for Na3V2(PO4) 2F3 electrodes charged and discharged at selected voltages showed that the material structure expanded along the c axis during charging up to 4.3 V and returned to its original dimensions after cycling. This is attributed to the extraction/insertion of Na atoms layers along the (002) a-b plane in the tetragonal structure.",

author = "Kuniko Chihara and Ayuko Kitajou and Gocheva, {Irina D.} and Shigeto Okada and Yamaki, {Jun Ichi}",

note = "Funding Information: This work was financially supported by the Elements Science & Technology Projects of MEXT . ",

year = "2013",

doi = "10.1016/j.jpowsour.2012.10.034",

language = "English",

volume = "227",

pages = "80--85",

journal = "Journal of Power Sources",

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T1 - Cathode properties of Na3M2(PO4) 2F3 [M = Ti, Fe, V] for sodium-ion batteries

AU - Chihara, Kuniko

AU - Kitajou, Ayuko

AU - Gocheva, Irina D.

AU - Okada, Shigeto

AU - Yamaki, Jun Ichi

N1 - Funding Information: This work was financially supported by the Elements Science & Technology Projects of MEXT .

PY - 2013

Y1 - 2013

N2 - The compounds Na3M2(PO4)2F 3 [M = Ti, Fe, V] were obtained by two-step solid-state synthesis, and its electrochemical properties as cathode active materials of sodium-ion batteries were investigated. The obtained Na3M2(PO 4)2F3 materials were found to have a tetragonal structure with a space group, P42/mnm, and were isostructural with β-Na3V2(PO4)2F3 by X-ray powder diffraction (XRD) measurements. Within this series, Na 3V2(PO4)2F3 in particular exhibited stability on cycling and a capacity of approximately 120 mAh g -1 against sodium metal. Capacity retention for this compound was 98%, even after the 40th cycle of prolonged charge/discharge measurements. Ex-situ XRD data for Na3V2(PO4) 2F3 electrodes charged and discharged at selected voltages showed that the material structure expanded along the c axis during charging up to 4.3 V and returned to its original dimensions after cycling. This is attributed to the extraction/insertion of Na atoms layers along the (002) a-b plane in the tetragonal structure.

AB - The compounds Na3M2(PO4)2F 3 [M = Ti, Fe, V] were obtained by two-step solid-state synthesis, and its electrochemical properties as cathode active materials of sodium-ion batteries were investigated. The obtained Na3M2(PO 4)2F3 materials were found to have a tetragonal structure with a space group, P42/mnm, and were isostructural with β-Na3V2(PO4)2F3 by X-ray powder diffraction (XRD) measurements. Within this series, Na 3V2(PO4)2F3 in particular exhibited stability on cycling and a capacity of approximately 120 mAh g -1 against sodium metal. Capacity retention for this compound was 98%, even after the 40th cycle of prolonged charge/discharge measurements. Ex-situ XRD data for Na3V2(PO4) 2F3 electrodes charged and discharged at selected voltages showed that the material structure expanded along the c axis during charging up to 4.3 V and returned to its original dimensions after cycling. This is attributed to the extraction/insertion of Na atoms layers along the (002) a-b plane in the tetragonal structure.

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