F. Ronci et al., In situ energy dispersive X-ray diffraction study of LiNi0.8Co0.2O2 cathode material for lithium batteries, J PHYS CH B, 105(4), 2001, pp. 754-759
The investigation of structural changes of intercalation materials during c
ycling is of primary importance to understand the factors that limit their
cyclability. In particular in-situ measurements, allowing the simultaneous
acquisition of structural and electrochemical data, consent to directly cor
relate the cycling performance of the material under test to its structure
evolution and vice versa. The energy dispersive X-ray diffraction (EDXD) te
chnique has been applied to the study of the structural evolution of LiNi0.
8Co0.2O2 during several charge-discharge cycles performed with increasing a
nodic Limits. This way of monitoring the effect of Li ions intercalation-de
intercalation process on the host materials lattice parameters proved to be
a valid alternative to the traditional angle dispersive X-ray diffractian
(ADXD) method, solving some of its problems, first of all the question of t
he X-ray absorption. The results described in this paper confirm what repor
ted in previous literature works based on in-situ ADXD and deepen the study
of the LiNi0.8Co0.2O2 structural changes, with large oversampling and good
statistical accuracy, extending the investigation to the first 7 cycles wi
th increased anodic limits approaching full delithiation.