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Title: Synthesis and electrochemical characterization of divalent cation-incorporated lithium nickel oxide

Abstract

Divalent cation incorporated Li{sub 1+x}NiMg{sub x}O{sub 2(1+x)} materials, corresponding to LiNi{sub 1{minus}y}Mg{sub y}O{sub 2} [y = x(1 + x)], represent a class of novel materials with unique electrochemical characteristics. Excellent cyclability (reversibility) when cycled up to high potentials (e.g., 4.4 V with respect to Li), as well as higher thermal stability in comparison to pure LiNiO{sub 2}, are the major benefits of these divalent cation incorporated materials. In the present work, a series of material compositions (x = 0, 0.05, 0.10, 0.15, and 0.20) have been successfully synthesized and electrochemically characterized. The introduction of Mg results in the elimination of phase transformations and causes smaller unit cell volume changes during cycling. More importantly, it results in a significant decrease in the capacity fade rate. Results of these studies reveal that the suppression of decomposition reactions during cycling is the prime reason for this improvement in capacity fade rate rather than the elimination of phase transformations and the smaller unit cell volume change. Suppression of the decomposition reactions is thought to be due to the prevention of overcharging of the material as well as the stabilization of NiO{sub 2} slabs caused by the presence of Mg cations.

Authors:
; ;
Publication Date:
Research Org.:
Carnegie Mellon Univ., Pittsburgh, PA (US)
OSTI Identifier:
20080569
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; LITHIUM OXIDES; NICKEL OXIDES; MAGNESIUM OXIDES; ELECTRICAL PROPERTIES; SYNTHESIS; PHASE TRANSFORMATIONS; METAL-NONMETAL BATTERIES; ELECTRODES

Citation Formats

Chang, C.C., Kim, J.Y., and Kumta, P.N. Synthesis and electrochemical characterization of divalent cation-incorporated lithium nickel oxide. United States: N. p., 2000. Web. doi:10.1149/1.1393424.
Chang, C.C., Kim, J.Y., & Kumta, P.N. Synthesis and electrochemical characterization of divalent cation-incorporated lithium nickel oxide. United States. doi:10.1149/1.1393424.
Chang, C.C., Kim, J.Y., and Kumta, P.N. Mon . "Synthesis and electrochemical characterization of divalent cation-incorporated lithium nickel oxide". United States. doi:10.1149/1.1393424.
@article{osti_20080569,
title = {Synthesis and electrochemical characterization of divalent cation-incorporated lithium nickel oxide},
author = {Chang, C.C. and Kim, J.Y. and Kumta, P.N.},
abstractNote = {Divalent cation incorporated Li{sub 1+x}NiMg{sub x}O{sub 2(1+x)} materials, corresponding to LiNi{sub 1{minus}y}Mg{sub y}O{sub 2} [y = x(1 + x)], represent a class of novel materials with unique electrochemical characteristics. Excellent cyclability (reversibility) when cycled up to high potentials (e.g., 4.4 V with respect to Li), as well as higher thermal stability in comparison to pure LiNiO{sub 2}, are the major benefits of these divalent cation incorporated materials. In the present work, a series of material compositions (x = 0, 0.05, 0.10, 0.15, and 0.20) have been successfully synthesized and electrochemically characterized. The introduction of Mg results in the elimination of phase transformations and causes smaller unit cell volume changes during cycling. More importantly, it results in a significant decrease in the capacity fade rate. Results of these studies reveal that the suppression of decomposition reactions during cycling is the prime reason for this improvement in capacity fade rate rather than the elimination of phase transformations and the smaller unit cell volume change. Suppression of the decomposition reactions is thought to be due to the prevention of overcharging of the material as well as the stabilization of NiO{sub 2} slabs caused by the presence of Mg cations.},
doi = {10.1149/1.1393424},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 5,
volume = 147,
place = {United States},
year = {2000},
month = {5}
}