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Title: Acid-delithiated Li{sub 1-x}(Ni{sub y}Co{sub 1-y}){sub 1+x}O{sub 2} as insertion electrodes in lithium batteries

Abstract

Monophase Li{sub 1-x}(Ni{sub y}Co{sub 1-y}){sub 1+x}O{sub 2} oxides (O {le} y {le} 0.4 and 0.8 {le} y {le} 0.9) with a layered structure (R3m space group) have been prepared by interaction of (Ni{sub y}Co{sub 1-y}){sub 3}O{sub 4} (O {le} y {le} 0.4) and Ni{sub y}Co{sub 1-y}O (0.8 {le} y {le} 0.9) with LiOH at low temperature (450{degrees}C). As in the case of high-temperature analogues, cobalt substitution for nickel stabilizes the Ni{sup 3+} ions and improves the two-dimensionality of the crystal lattice. Acid treatment of LT and HT oxides leads to a partial dissolution of the solid and to removal of lithium and {open_quotes}impurity{close_quotes} cobalt and/or nickel from LiO{sub 2} layers of the trigonal framework. For cobalt-rich oxides, the ion extraction is accompanied by partial Li{sup +}/H{sup +} exchange, especially for LT samples. Acid-delithiated oxides are studied as cathode materials in lithium batteries. The resulting cells show a high value of the initial voltage (4 V), which allows a direct discharge of the cell without previous charge. For LT samples, the discharge and charge processes occur at lower voltage (especially for Co-rich oxides) and the reversibility of the cell is lower as compared to that of HT analogues. The better reversibilitymore » of the cell in the 4.0-3.2 V range is found for HT Ni-rich oxide. The composition of the acid-treated oxides can be recovered without an enhancement polarization of the cell. XRD analysis and IR spectroscopy show good reversibility of lithium insertion and extraction reactions by chemical and electrochemical procedures.« less

Authors:
;  [1]; ;  [2]
  1. Universidad de Cordoba (Spain)
  2. Bulgarian Academy of Sciences, Sofia (Bulgaria)
Publication Date:
OSTI Identifier:
508649
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 113; Journal Issue: 1; Other Information: PBD: Nov 1994
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; LITHIUM OXIDES; ELECTRICAL PROPERTIES; NICKEL OXIDES; COBALT OXIDES; EXTRACTION; ELECTROLYTIC CELLS; X-RAY DIFFRACTION; ABSORPTION SPECTROSCOPY; STOICHIOMETRY; CHEMICAL PREPARATION

Citation Formats

Morales, J, Tirado, J L, Stoyanova, R, and Zhecheva, E. Acid-delithiated Li{sub 1-x}(Ni{sub y}Co{sub 1-y}){sub 1+x}O{sub 2} as insertion electrodes in lithium batteries. United States: N. p., 1994. Web. doi:10.1006/jssc.1994.1358.
Morales, J, Tirado, J L, Stoyanova, R, & Zhecheva, E. Acid-delithiated Li{sub 1-x}(Ni{sub y}Co{sub 1-y}){sub 1+x}O{sub 2} as insertion electrodes in lithium batteries. United States. doi:10.1006/jssc.1994.1358.
Morales, J, Tirado, J L, Stoyanova, R, and Zhecheva, E. Tue . "Acid-delithiated Li{sub 1-x}(Ni{sub y}Co{sub 1-y}){sub 1+x}O{sub 2} as insertion electrodes in lithium batteries". United States. doi:10.1006/jssc.1994.1358.
@article{osti_508649,
title = {Acid-delithiated Li{sub 1-x}(Ni{sub y}Co{sub 1-y}){sub 1+x}O{sub 2} as insertion electrodes in lithium batteries},
author = {Morales, J and Tirado, J L and Stoyanova, R and Zhecheva, E},
abstractNote = {Monophase Li{sub 1-x}(Ni{sub y}Co{sub 1-y}){sub 1+x}O{sub 2} oxides (O {le} y {le} 0.4 and 0.8 {le} y {le} 0.9) with a layered structure (R3m space group) have been prepared by interaction of (Ni{sub y}Co{sub 1-y}){sub 3}O{sub 4} (O {le} y {le} 0.4) and Ni{sub y}Co{sub 1-y}O (0.8 {le} y {le} 0.9) with LiOH at low temperature (450{degrees}C). As in the case of high-temperature analogues, cobalt substitution for nickel stabilizes the Ni{sup 3+} ions and improves the two-dimensionality of the crystal lattice. Acid treatment of LT and HT oxides leads to a partial dissolution of the solid and to removal of lithium and {open_quotes}impurity{close_quotes} cobalt and/or nickel from LiO{sub 2} layers of the trigonal framework. For cobalt-rich oxides, the ion extraction is accompanied by partial Li{sup +}/H{sup +} exchange, especially for LT samples. Acid-delithiated oxides are studied as cathode materials in lithium batteries. The resulting cells show a high value of the initial voltage (4 V), which allows a direct discharge of the cell without previous charge. For LT samples, the discharge and charge processes occur at lower voltage (especially for Co-rich oxides) and the reversibility of the cell is lower as compared to that of HT analogues. The better reversibility of the cell in the 4.0-3.2 V range is found for HT Ni-rich oxide. The composition of the acid-treated oxides can be recovered without an enhancement polarization of the cell. XRD analysis and IR spectroscopy show good reversibility of lithium insertion and extraction reactions by chemical and electrochemical procedures.},
doi = {10.1006/jssc.1994.1358},
journal = {Journal of Solid State Chemistry},
number = 1,
volume = 113,
place = {United States},
year = {1994},
month = {11}
}