skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Electrochemical and ex situ x-ray study of Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2} cathode material for Li secondary batteries.

Abstract

Electrochemical properties of Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2}, synthesized by a sol-gel method, were studied by galvanostatic cycling. When the Li/Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2} cell was cycled at 2.0--4.6 V, the material showed a long, irreversible plateau at 4.5--4.6 V and exhibited very high initial charge capacity of 240 mAh/g, which is much larger than a theoretical value for the reaction of Li(Li{sup +}{sub 0.2}Ni{sup 2+}{sub 0.2}Mn{sup 4+}{sub 0.6})O{sub 2} {yields} Li{sub 0.6}(Li{sup +}{sub 0.2}Ni{sup 4+}{sub 0.2}Mn{sup 4+}{sub 0.6})O{sub 2} + 0.4Li (126 mAh/g). Discharge capacity of the material gradually increased from 155 at the first cycle to 205 mAh/g at the tenth cycle and was stabilized afterward. From the ex situ X-ray study, we found that Li ions in the transition metal layer were irreversibly extracted during charging at a voltage higher than 4.5 V; the diffraction peaks corresponding to Li in the transition metal layer were hardly observed in the cathode material after extended cycling. The Li/Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2} cell that was cycled at 2.0--4.3 V showed stable but very small capacity (69 mAh/g) and Li in the transition metal layer remained almost intact. When the cell was initially charged to 4.6 V and thenmore » cycled at 2.0--4.3 V, the cathode material showed higher capacity (114 mAh/g) than the one cycled at 2.0--4.3 V.« less

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
EE
OSTI Identifier:
961270
Report Number(s):
ANL/CMT/JA-46010
Journal ID: ISSN 1099-0062; TRN: US201011%%543
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Electrochem. Solid State Lett.
Additional Journal Information:
Journal Volume: 6; Journal Issue: 9 ; Sep. 2003; Journal ID: ISSN 1099-0062
Country of Publication:
United States
Language:
ENGLISH
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; CAPACITY; CATHODES; CHARGES; DIFFRACTION; ELECTRIC BATTERIES; ELECTRIC POTENTIAL; ELECTRODES; IONS; LAYERS; LITHIUM; LITHIUM COMPOUNDS; MANGANESE OXIDES; MATERIALS; NICKEL OXIDES; PEAKS; SOL-GEL PROCESS; TRANSITION ELEMENTS; X-RAY DIFFRACTION

Citation Formats

Kang, S -H, Sun, Y K, Amine, K, Chemical Engineering, and Hanyang Univ. Electrochemical and ex situ x-ray study of Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2} cathode material for Li secondary batteries.. United States: N. p., 2003. Web. doi:10.1149/1.1594411.
Kang, S -H, Sun, Y K, Amine, K, Chemical Engineering, & Hanyang Univ. Electrochemical and ex situ x-ray study of Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2} cathode material for Li secondary batteries.. United States. doi:10.1149/1.1594411.
Kang, S -H, Sun, Y K, Amine, K, Chemical Engineering, and Hanyang Univ. Mon . "Electrochemical and ex situ x-ray study of Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2} cathode material for Li secondary batteries.". United States. doi:10.1149/1.1594411.
@article{osti_961270,
title = {Electrochemical and ex situ x-ray study of Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2} cathode material for Li secondary batteries.},
author = {Kang, S -H and Sun, Y K and Amine, K and Chemical Engineering and Hanyang Univ.},
abstractNote = {Electrochemical properties of Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2}, synthesized by a sol-gel method, were studied by galvanostatic cycling. When the Li/Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2} cell was cycled at 2.0--4.6 V, the material showed a long, irreversible plateau at 4.5--4.6 V and exhibited very high initial charge capacity of 240 mAh/g, which is much larger than a theoretical value for the reaction of Li(Li{sup +}{sub 0.2}Ni{sup 2+}{sub 0.2}Mn{sup 4+}{sub 0.6})O{sub 2} {yields} Li{sub 0.6}(Li{sup +}{sub 0.2}Ni{sup 4+}{sub 0.2}Mn{sup 4+}{sub 0.6})O{sub 2} + 0.4Li (126 mAh/g). Discharge capacity of the material gradually increased from 155 at the first cycle to 205 mAh/g at the tenth cycle and was stabilized afterward. From the ex situ X-ray study, we found that Li ions in the transition metal layer were irreversibly extracted during charging at a voltage higher than 4.5 V; the diffraction peaks corresponding to Li in the transition metal layer were hardly observed in the cathode material after extended cycling. The Li/Li(Li{sub 0.2}Ni{sub 0.2}Mn{sub 0.6})O{sub 2} cell that was cycled at 2.0--4.3 V showed stable but very small capacity (69 mAh/g) and Li in the transition metal layer remained almost intact. When the cell was initially charged to 4.6 V and then cycled at 2.0--4.3 V, the cathode material showed higher capacity (114 mAh/g) than the one cycled at 2.0--4.3 V.},
doi = {10.1149/1.1594411},
journal = {Electrochem. Solid State Lett.},
issn = {1099-0062},
number = 9 ; Sep. 2003,
volume = 6,
place = {United States},
year = {2003},
month = {9}
}