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Title: O2 structure Li{sub 2/3}[Ni{sub 1/3}Mn{sub 2/3}]O{sub 2}: A new layered cathode material for rechargeable lithium batteries. 1. Electrochemical properties

Abstract

Layered Li-Mn oxide-based materials (Li{sub 2/3}[Ni{sub x}Mn{sub 1{minus}x}]O{sub 2}) with the unconventional P2 structure were prepared by ion exchanging Na for Li in the corresponding P2 structure sodium bronzes, Na{sub 2/3}(Ni{sub x}Mn{sub 1{minus}x})O{sub 2}. Powder X-ray diffraction (XRD) was used to confirm the purity and structure of the phase. The Bragg peaks from Li{sub 2/3}[Ni{sub 1/3}Mn{sub 2/3}]O{sub 2} can be indexed based on a hexagonal unit cell with dimensions a = 2.8609{angstrom} and c = 10.061{angstrom}, and the diffraction pattern can be approximately matched assuming that the atoms are in 2a and 2b positions of space group P6{sub 3}mc. However, the initial structure is more complex, because some observed diffraction peaks (i.e., 111) are forbidden in this space group. In situ XRD and electrochemical testing were used to investigate the behavior of O2-type Li{sub 2/3}[Ni{sub x}Mn{sub 1{minus}x}]O{sub 2} as a cathode for rechargeable lithium batteries. It exhibits a large reversible capacity of approximately 180 mAh/g divided into two plateaus centered near 2.8 and 3.9 V. In situ XRD proves that after an initial phase transformation, during which all forbidden diffraction peaks vanish, the extraction and insertion of lithium occurs without any first order phase transitions. The material remains layered andmore » does not transfer to the spinel structure during cycling. It shows good capacity retention vs. cycle number at both 30 and 55 C. Differential scanning calorimetry measurements on charged electrodes show exotherms that are about one order of magnitude less intense than those from charged Li{sub x}CoO{sub 2} electrodes.« less

Authors:
; ;
Publication Date:
Research Org.:
Dalhousie Univ., Halifax, Nova Scotia (CA)
OSTI Identifier:
20030639
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 3; Other Information: PBD: Mar 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; ELECTRIC BATTERIES; MANGANATES; NICKEL OXIDES; CATHODES; LAYERS; SYNTHESIS; LITHIUM OXIDES

Citation Formats

Paulsen, J M, Thomas, C L, and Dahn, J R. O2 structure Li{sub 2/3}[Ni{sub 1/3}Mn{sub 2/3}]O{sub 2}: A new layered cathode material for rechargeable lithium batteries. 1. Electrochemical properties. United States: N. p., 2000. Web. doi:10.1149/1.1393283.
Paulsen, J M, Thomas, C L, & Dahn, J R. O2 structure Li{sub 2/3}[Ni{sub 1/3}Mn{sub 2/3}]O{sub 2}: A new layered cathode material for rechargeable lithium batteries. 1. Electrochemical properties. United States. doi:10.1149/1.1393283.
Paulsen, J M, Thomas, C L, and Dahn, J R. Wed . "O2 structure Li{sub 2/3}[Ni{sub 1/3}Mn{sub 2/3}]O{sub 2}: A new layered cathode material for rechargeable lithium batteries. 1. Electrochemical properties". United States. doi:10.1149/1.1393283.
@article{osti_20030639,
title = {O2 structure Li{sub 2/3}[Ni{sub 1/3}Mn{sub 2/3}]O{sub 2}: A new layered cathode material for rechargeable lithium batteries. 1. Electrochemical properties},
author = {Paulsen, J M and Thomas, C L and Dahn, J R},
abstractNote = {Layered Li-Mn oxide-based materials (Li{sub 2/3}[Ni{sub x}Mn{sub 1{minus}x}]O{sub 2}) with the unconventional P2 structure were prepared by ion exchanging Na for Li in the corresponding P2 structure sodium bronzes, Na{sub 2/3}(Ni{sub x}Mn{sub 1{minus}x})O{sub 2}. Powder X-ray diffraction (XRD) was used to confirm the purity and structure of the phase. The Bragg peaks from Li{sub 2/3}[Ni{sub 1/3}Mn{sub 2/3}]O{sub 2} can be indexed based on a hexagonal unit cell with dimensions a = 2.8609{angstrom} and c = 10.061{angstrom}, and the diffraction pattern can be approximately matched assuming that the atoms are in 2a and 2b positions of space group P6{sub 3}mc. However, the initial structure is more complex, because some observed diffraction peaks (i.e., 111) are forbidden in this space group. In situ XRD and electrochemical testing were used to investigate the behavior of O2-type Li{sub 2/3}[Ni{sub x}Mn{sub 1{minus}x}]O{sub 2} as a cathode for rechargeable lithium batteries. It exhibits a large reversible capacity of approximately 180 mAh/g divided into two plateaus centered near 2.8 and 3.9 V. In situ XRD proves that after an initial phase transformation, during which all forbidden diffraction peaks vanish, the extraction and insertion of lithium occurs without any first order phase transitions. The material remains layered and does not transfer to the spinel structure during cycling. It shows good capacity retention vs. cycle number at both 30 and 55 C. Differential scanning calorimetry measurements on charged electrodes show exotherms that are about one order of magnitude less intense than those from charged Li{sub x}CoO{sub 2} electrodes.},
doi = {10.1149/1.1393283},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 3,
volume = 147,
place = {United States},
year = {2000},
month = {3}
}