Abstract
The structural change of LiNi 1/2Mn 1/2O 2 ( a=2.89 Å, c=14.31 Å in hexagonal setting) during charge and discharge was examined by means of ex-situ X-ray diffraction (XRD) measurements. The integrated intensity ratio of the (0 0 3) to (1 0 4) diffraction lines increased from ca. 0.9 at an initial state to ca. 1.5 when LiNi 1/2Mn 1/2O 2 was oxidized up to x=0.7 in Li 1− x Ni 1/2Mn 1/2O 2 corresponding to the charge capacity of 200 mA h g −1 based on the sample weight, while the change in lattice dimensions of a- and c- axis was similar to those of LiCo x Ni 1− x O 2. The change in the intensity ratio of I (0 0 3) / I (1 0 4) was reversible between ca. 0.9 and 1.5 during charge and discharge. From these results, structural changes of layered lithium insertion material of LiNi 1/2Mn 1/2O 2 during charge and discharge were discussed.
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