Revealing the role of the amorphous phase in the Na0.74CoO2/C/N composite cathode

Z.Y. Wang, F.Y. Xiong, H.Z. Tao, Yuanzheng Yue

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

To optimize the Na0·74CoO2-based cathode materials for sodium-ion batteries, we fabricated a series of Na0·74CoO2/C/N-based composites by sintering the mixtures of ZIF-4(Co) (Co [H2C3N2]2) and Na2CO3, which possess various molar Na/Co ratios (X = 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 and 2.0), at 800 °C for 6 h. By performing the electrochemical characterizations, we found that the composite with X = 0.7 (NC-0.7) exhibits the optimum sodium storage performance, i.e., excellent Na+ storage capacity (107.9 mA h g−1 at 0.1 C), and high cycling stability (74% of the discharge capacity retention after 500 cycles at 10 C). In addition, for this NC-0.7 composite, we discovered a large difference (48.1 mA h g−1) between the charging (59.8 mA h g−1) and discharging (107.9 mA h g−1) capacities for the first cycle. Using the X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscope, we clarified the atomic-scale origin of the large capacity difference, and revealed the role of the amorphous phase in the as-prepared Na0·74CoO2/C/N composite cathode.

OriginalsprogEngelsk
Artikelnummer152616
TidsskriftJournal of Alloys and Compounds
Vol/bind815
ISSN0925-8388
DOI
StatusUdgivet - 2020

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Cathodes
Composite materials
Sodium
High resolution transmission electron microscopy
Electron microscopes
Sintering
X ray photoelectron spectroscopy
Ions
Scanning

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title = "Revealing the role of the amorphous phase in the Na0.74CoO2/C/N composite cathode",
abstract = "To optimize the Na0·74CoO2-based cathode materials for sodium-ion batteries, we fabricated a series of Na0·74CoO2/C/N-based composites by sintering the mixtures of ZIF-4(Co) (Co [H2C3N2]2) and Na2CO3, which possess various molar Na/Co ratios (X = 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 and 2.0), at 800 °C for 6 h. By performing the electrochemical characterizations, we found that the composite with X = 0.7 (NC-0.7) exhibits the optimum sodium storage performance, i.e., excellent Na+ storage capacity (107.9 mA h g−1 at 0.1 C), and high cycling stability (74{\%} of the discharge capacity retention after 500 cycles at 10 C). In addition, for this NC-0.7 composite, we discovered a large difference (48.1 mA h g−1) between the charging (59.8 mA h g−1) and discharging (107.9 mA h g−1) capacities for the first cycle. Using the X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscope, we clarified the atomic-scale origin of the large capacity difference, and revealed the role of the amorphous phase in the as-prepared Na0·74CoO2/C/N composite cathode.",
author = "Z.Y. Wang and F.Y. Xiong and H.Z. Tao and Yuanzheng Yue",
year = "2020",
doi = "10.1016/j.jallcom.2019.152616",
language = "English",
volume = "815",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier",

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Revealing the role of the amorphous phase in the Na0.74CoO2/C/N composite cathode. / Wang, Z.Y.; Xiong, F.Y.; Tao, H.Z.; Yue, Yuanzheng.

I: Journal of Alloys and Compounds, Bind 815, 152616, 2020.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Revealing the role of the amorphous phase in the Na0.74CoO2/C/N composite cathode

AU - Wang, Z.Y.

AU - Xiong, F.Y.

AU - Tao, H.Z.

AU - Yue, Yuanzheng

PY - 2020

Y1 - 2020

N2 - To optimize the Na0·74CoO2-based cathode materials for sodium-ion batteries, we fabricated a series of Na0·74CoO2/C/N-based composites by sintering the mixtures of ZIF-4(Co) (Co [H2C3N2]2) and Na2CO3, which possess various molar Na/Co ratios (X = 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 and 2.0), at 800 °C for 6 h. By performing the electrochemical characterizations, we found that the composite with X = 0.7 (NC-0.7) exhibits the optimum sodium storage performance, i.e., excellent Na+ storage capacity (107.9 mA h g−1 at 0.1 C), and high cycling stability (74% of the discharge capacity retention after 500 cycles at 10 C). In addition, for this NC-0.7 composite, we discovered a large difference (48.1 mA h g−1) between the charging (59.8 mA h g−1) and discharging (107.9 mA h g−1) capacities for the first cycle. Using the X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscope, we clarified the atomic-scale origin of the large capacity difference, and revealed the role of the amorphous phase in the as-prepared Na0·74CoO2/C/N composite cathode.

AB - To optimize the Na0·74CoO2-based cathode materials for sodium-ion batteries, we fabricated a series of Na0·74CoO2/C/N-based composites by sintering the mixtures of ZIF-4(Co) (Co [H2C3N2]2) and Na2CO3, which possess various molar Na/Co ratios (X = 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 and 2.0), at 800 °C for 6 h. By performing the electrochemical characterizations, we found that the composite with X = 0.7 (NC-0.7) exhibits the optimum sodium storage performance, i.e., excellent Na+ storage capacity (107.9 mA h g−1 at 0.1 C), and high cycling stability (74% of the discharge capacity retention after 500 cycles at 10 C). In addition, for this NC-0.7 composite, we discovered a large difference (48.1 mA h g−1) between the charging (59.8 mA h g−1) and discharging (107.9 mA h g−1) capacities for the first cycle. Using the X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscope, we clarified the atomic-scale origin of the large capacity difference, and revealed the role of the amorphous phase in the as-prepared Na0·74CoO2/C/N composite cathode.

U2 - 10.1016/j.jallcom.2019.152616

DO - 10.1016/j.jallcom.2019.152616

M3 - Journal article

VL - 815

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 152616

ER -