Effects of aluminum doping in the phase stability and electrochemical properties of LiCoO{sub 2} and LiMnO{sub 2}

Conference · Wed Jul 01 04:00:00 EDT 1998

OSTI ID:20019172

Jang, Y I; Huang, B; Wang, H; Chiang, Y M; Sadoway, D R

Aluminum is of interest as a constituent for Li battery electrodes due to its low cost and low mass, and because ab initio calculations indicate that solid solution of LiAlO{sub 2} with LiMO{sub 2} (M = transition metal) in the {alpha}-NaFeO{sub 2} structure can increase intercalation voltage. In this study, the authors investigated the effect of Al doping on LiCoO{sub 2} and LiMnO{sub 2}. Single phase LiAl{sub y}Co{sub 1{minus}y}O{sub 2} has been synthesized up to y = 0.5 by firing homogeneous hydroxide precursors. A systematic increase in the open circuit voltage is observed with Al content. In LiAl{sub y}Mn{sub 1{minus}y}O{sub 2}, the addition of LiAlO{sub 2} stabilizes LiMnO{sub 2} in the {alpha}-NaFeO{sub 2} structure under conditions where neither endmember is stable in the structure. High reversible capacity was obtained over both a 4 V and 3 V plateau, indicating that the compound transforms to a spinel-related structure during cycling, but that the cooperative Jahn-Teller distortion is suppressed.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (US)
• Sponsoring Organization: Furukawa Electric Company; Idaho National Engineering and Environmental Laboratory; National Science Foundation
• OSTI ID: 20019172
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
CATHODES
CLATHRATES
COBALT OXIDES
CRYSTAL DOPING
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELECTROCHEMISTRY
EXPERIMENTAL DATA
LITHIUM OXIDES
MANGANESE OXIDES
METAL-NONMETAL BATTERIES
PHASE STUDIES