Abstract
A synchrotron based in situ XRD technique was used to investigate the structural changes of Li 1− x Co 1/3Ni 1/3Mn 1/3O 2 as cathode material in lithium battery during first charge in comparison with Li 1− x Ni 0.8Co 0.15Al 0.05O 2. The structural changes of these two cathode materials during first charge follow the similar trend as LiNiO 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 1− x Co 1/3Ni 1/3Mn 1/3O 2 is higher than in Li 1− x Ni 0.8Co 0.15Al 0.05O 2, which in turn is higher than in LiNiO 2. More importantly, the structural stability of Li 1− x Co 1/3Ni 1/3Mn 1/3O 2 is higher than Li 1− x Ni 0.8Co 0.15Al 0.05O 2, which in turn is higher than LiNiO 2, as reflected in the suppression of hexagonal 3 (H3) phase with collapsed c-axis formed at the end of charge.
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