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Title: Structural characterization of layered Li{sub x}Ni{sub 0.5}Mn{sub 0.5}O{sub 2}(0

Abstract

X-ray diffraction and X-ray absorption spectroscopy experiments were used to study chemical and electrochemical Li insertion and extraction reactions of LiNi{sub 0.5}Mn{sub 0.5}O{sub 2}. These results, along with galvanostatic cycling data, suggest that LiNi{sub 0.5}Mn{sub 0.5}O{sub 2} layered electrodes in lithium batteries operate predominantly off two-electron redox couples, Ni{sup 4+}/Ni{sup 2+}, between approximately 4.5 and 1.25 V and Mn{sup 4+}/Mn{sup 2+} between 1.25 and 1.0 V versus metallic Li, respectively. The retention of a stable layered framework structure and the apparent absence of Jahn-Teller ions Ni{sup 3+} and Mn{sup 3+} in the high- or low-voltage region is believed to be responsible for the excellent structural and electrochemical stability of these electrodes. The LiNi{sub 0.5}Mn{sub 0.5}O{sub 2} layered oxide reversibly reacts chemically or electrochemically with Li to form an air-sensitive, dilithium compound, Li{sub 2}Ni{sub 0.5}Mn{sub 0.5}O{sub 2}, with a hexagonal structure analogous to Li{sub 2}MnO{sub 2}. The cycling behavior of Li/LiNi{sub 0.5}Mn{sub 0.5}O{sub 2} cells over a large voltage window (4.6-1.0 V) and with very slow rates shows that rechargeable capacities >500 mA{center_dot}h/g can be obtained.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); EE
OSTI Identifier:
961266
Report Number(s):
ANL/CMT/JA-45953
Journal ID: ISSN 0897-4756; CMATEX; TRN: US201011%%539
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Chem. Mater.
Additional Journal Information:
Journal Volume: 15; Journal Issue: 12 ; 2003; Journal ID: ISSN 0897-4756
Country of Publication:
United States
Language:
ENGLISH
Subject:
25 ENERGY STORAGE; ABSORPTION SPECTROSCOPY; ELECTRIC BATTERIES; ELECTRIC POTENTIAL; ELECTRODES; EXTRACTION; IONS; LITHIUM; LITHIUM OXIDES; MANGANESE OXIDES; NICKEL OXIDES; OXIDES; RETENTION; STABILITY; X-RAY DIFFRACTION

Citation Formats

Johnson, C S, Kim, J -S, Kropf, A J, Kahaian, A J, Vaughey, J T, Fransson, L, Edstrom, K, Thackeray, M M, Chemical Engineering, and Uppsala Univ. Structural characterization of layered Li{sub x}Ni{sub 0.5}Mn{sub 0.5}O{sub 2}(0. United States: N. p., 2003. Web. doi:10.1021/cm0204728.
Johnson, C S, Kim, J -S, Kropf, A J, Kahaian, A J, Vaughey, J T, Fransson, L, Edstrom, K, Thackeray, M M, Chemical Engineering, & Uppsala Univ. Structural characterization of layered Li{sub x}Ni{sub 0.5}Mn{sub 0.5}O{sub 2}(0. United States. doi:10.1021/cm0204728.
Johnson, C S, Kim, J -S, Kropf, A J, Kahaian, A J, Vaughey, J T, Fransson, L, Edstrom, K, Thackeray, M M, Chemical Engineering, and Uppsala Univ. Wed . "Structural characterization of layered Li{sub x}Ni{sub 0.5}Mn{sub 0.5}O{sub 2}(0". United States. doi:10.1021/cm0204728.
@article{osti_961266,
title = {Structural characterization of layered Li{sub x}Ni{sub 0.5}Mn{sub 0.5}O{sub 2}(0},
author = {Johnson, C S and Kim, J -S and Kropf, A J and Kahaian, A J and Vaughey, J T and Fransson, L and Edstrom, K and Thackeray, M M and Chemical Engineering and Uppsala Univ.},
abstractNote = {X-ray diffraction and X-ray absorption spectroscopy experiments were used to study chemical and electrochemical Li insertion and extraction reactions of LiNi{sub 0.5}Mn{sub 0.5}O{sub 2}. These results, along with galvanostatic cycling data, suggest that LiNi{sub 0.5}Mn{sub 0.5}O{sub 2} layered electrodes in lithium batteries operate predominantly off two-electron redox couples, Ni{sup 4+}/Ni{sup 2+}, between approximately 4.5 and 1.25 V and Mn{sup 4+}/Mn{sup 2+} between 1.25 and 1.0 V versus metallic Li, respectively. The retention of a stable layered framework structure and the apparent absence of Jahn-Teller ions Ni{sup 3+} and Mn{sup 3+} in the high- or low-voltage region is believed to be responsible for the excellent structural and electrochemical stability of these electrodes. The LiNi{sub 0.5}Mn{sub 0.5}O{sub 2} layered oxide reversibly reacts chemically or electrochemically with Li to form an air-sensitive, dilithium compound, Li{sub 2}Ni{sub 0.5}Mn{sub 0.5}O{sub 2}, with a hexagonal structure analogous to Li{sub 2}MnO{sub 2}. The cycling behavior of Li/LiNi{sub 0.5}Mn{sub 0.5}O{sub 2} cells over a large voltage window (4.6-1.0 V) and with very slow rates shows that rechargeable capacities >500 mA{center_dot}h/g can be obtained.},
doi = {10.1021/cm0204728},
journal = {Chem. Mater.},
issn = {0897-4756},
number = 12 ; 2003,
volume = 15,
place = {United States},
year = {2003},
month = {1}
}