A Comparative Study on Structural Changes of LiCo1/3Ni1/3Mn1/3O2 and LiNi0.8Co0.15Al0.05O2 During First Charge using in situ XRD
Journal Article
·
· Electrochem. Commun.
A synchrotron based in situ XRD technique was used to investigate the structural changes of Li{sub 1-x}Co{sub 1/3}Ni{sub 1/3}Mn{sub 1/3}O{sub 2} as cathode material in lithium battery during first charge in comparison with Li{sub 1-x}Ni{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2}. The structural changes of these two cathode materials during first charge follow the similar trend as LiNiO{sub 2}: an expansion along the c-axis of the unit cell with contractions along the a- and b-axis during the early stage of charge and a major contraction along the c-axis with slight expansions along the a- and b-axis near the end of charge at high voltage limit. However, the degree of disorder in Li{sub 1-x}Co{sub 1/3}Ni{sub 1/3}Mn{sub 1/3}O{sub 2} is higher than in Li{sub 1-x}Ni{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2}, which in turn is higher than in LiNiO{sub 2}. More importantly, the structural stability of Li{sub 1-x}Co{sub 1/3}Ni{sub 1/3}Mn{sub 1/3}O{sub 2} is higher than Li{sub 1-x}Ni{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2}, which in turn is higher than LiNiO{sub 2}, as reflected in the suppression of hexagonal 3 (H3) phase with collapsed c-axis formed at the end of charge.
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 914183
- Report Number(s):
- BNL--78751-2007-JA
- Journal Information:
- Electrochem. Commun., Journal Name: Electrochem. Commun. Journal Issue: 8 Vol. 8; ISSN 1388-2481
- Country of Publication:
- United States
- Language:
- English
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