P2/O3 phase-integrated Na0.7MnO2 cathode materials for sodium-ion rechargeable batteries

M. Alam Khan; Dongwook Han; Gihyeok Lee; Yong Il Kim; Yong Mook Kang

doi:10.1016/j.jallcom.2018.09.033

P2/O3 phase-integrated Na_0.7MnO₂ cathode materials for sodium-ion rechargeable batteries

M. Alam Khan, Dongwook Han, Gihyeok Lee, Yong Il Kim, Yong Mook Kang

Dept. of Future Energy Convergence

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

69 Scopus citations

Abstract

We describe a phase-integrated P2-Na_0.7MnO₂/O3-NaMnO₂ sodium manganese oxide (Na_0.7MnO₂) cathode material for sodium-ion rechargeable batteries. By changing the crystallization cooling rate after the calcination of P2/O3-Na_0.7MnO₂, the ratio between the two different (P2-Na_0.7MnO₂ and O3-NaMnO₂) phases (and the Mn⁴⁺/Mn³⁺ ratio) in the Na_0.7MnO₂ material could be controlled. The P2/O3-Na_0.7MnO₂ sample prepared by fast cooling contains the optimum content of the two principal phases and showed excellent electrochemical performance because of the synergy between the fast kinetics of the P2-Na_0.7MnO₂ phase and high capacity of the O3-NaMnO₂ phase. The stability of the layered crystal structure of Na_0.7MnO₂ was also improved by increasing the portion of the P2-Na_0.7MnO₂ phase, which has a higher average oxidation state of Mn compared to that in O3-NaMnO₂; this suppressed the Jahn–Teller distortion during cycling.

Original language	English
Pages (from-to)	987-993
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	771
DOIs	https://doi.org/10.1016/j.jallcom.2018.09.033
State	Published - 15 Jan 2019

Keywords

Cooling rate
Phase integration
Raman spectra
Rietveld refinement
Sodium manganese oxides
Sodium-ion rechargeable battery

UN SDGs

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

Access to Document

10.1016/j.jallcom.2018.09.033

Cite this

@article{24cbe677fe7341698d2ff53d264f9d7c,

title = "P2/O3 phase-integrated Na0.7MnO2 cathode materials for sodium-ion rechargeable batteries",

abstract = "We describe a phase-integrated P2-Na0.7MnO2/O3-NaMnO2 sodium manganese oxide (Na0.7MnO2) cathode material for sodium-ion rechargeable batteries. By changing the crystallization cooling rate after the calcination of P2/O3-Na0.7MnO2, the ratio between the two different (P2-Na0.7MnO2 and O3-NaMnO2) phases (and the Mn4+/Mn3+ ratio) in the Na0.7MnO2 material could be controlled. The P2/O3-Na0.7MnO2 sample prepared by fast cooling contains the optimum content of the two principal phases and showed excellent electrochemical performance because of the synergy between the fast kinetics of the P2-Na0.7MnO2 phase and high capacity of the O3-NaMnO2 phase. The stability of the layered crystal structure of Na0.7MnO2 was also improved by increasing the portion of the P2-Na0.7MnO2 phase, which has a higher average oxidation state of Mn compared to that in O3-NaMnO2; this suppressed the Jahn–Teller distortion during cycling.",

keywords = "Cooling rate, Phase integration, Raman spectra, Rietveld refinement, Sodium manganese oxides, Sodium-ion rechargeable battery",

author = "Khan, \{M. Alam\} and Dongwook Han and Gihyeok Lee and Kim, \{Yong Il\} and Kang, \{Yong Mook\}",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2019",

month = jan,

day = "15",

doi = "10.1016/j.jallcom.2018.09.033",

language = "English",

volume = "771",

pages = "987--993",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

}

TY - JOUR

T1 - P2/O3 phase-integrated Na0.7MnO2 cathode materials for sodium-ion rechargeable batteries

AU - Khan, M. Alam

AU - Han, Dongwook

AU - Lee, Gihyeok

AU - Kim, Yong Il

AU - Kang, Yong Mook

PY - 2019/1/15

Y1 - 2019/1/15

N2 - We describe a phase-integrated P2-Na0.7MnO2/O3-NaMnO2 sodium manganese oxide (Na0.7MnO2) cathode material for sodium-ion rechargeable batteries. By changing the crystallization cooling rate after the calcination of P2/O3-Na0.7MnO2, the ratio between the two different (P2-Na0.7MnO2 and O3-NaMnO2) phases (and the Mn4+/Mn3+ ratio) in the Na0.7MnO2 material could be controlled. The P2/O3-Na0.7MnO2 sample prepared by fast cooling contains the optimum content of the two principal phases and showed excellent electrochemical performance because of the synergy between the fast kinetics of the P2-Na0.7MnO2 phase and high capacity of the O3-NaMnO2 phase. The stability of the layered crystal structure of Na0.7MnO2 was also improved by increasing the portion of the P2-Na0.7MnO2 phase, which has a higher average oxidation state of Mn compared to that in O3-NaMnO2; this suppressed the Jahn–Teller distortion during cycling.

AB - We describe a phase-integrated P2-Na0.7MnO2/O3-NaMnO2 sodium manganese oxide (Na0.7MnO2) cathode material for sodium-ion rechargeable batteries. By changing the crystallization cooling rate after the calcination of P2/O3-Na0.7MnO2, the ratio between the two different (P2-Na0.7MnO2 and O3-NaMnO2) phases (and the Mn4+/Mn3+ ratio) in the Na0.7MnO2 material could be controlled. The P2/O3-Na0.7MnO2 sample prepared by fast cooling contains the optimum content of the two principal phases and showed excellent electrochemical performance because of the synergy between the fast kinetics of the P2-Na0.7MnO2 phase and high capacity of the O3-NaMnO2 phase. The stability of the layered crystal structure of Na0.7MnO2 was also improved by increasing the portion of the P2-Na0.7MnO2 phase, which has a higher average oxidation state of Mn compared to that in O3-NaMnO2; this suppressed the Jahn–Teller distortion during cycling.

KW - Cooling rate

KW - Phase integration

KW - Raman spectra

KW - Rietveld refinement

KW - Sodium manganese oxides

KW - Sodium-ion rechargeable battery

UR - http://www.scopus.com/inward/record.url?scp=85053033634&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2018.09.033

DO - 10.1016/j.jallcom.2018.09.033

M3 - Article

AN - SCOPUS:85053033634

SN - 0925-8388

VL - 771

SP - 987

EP - 993

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -