Fig. 1: Crystal structure features of the Mn-rich QO-NCM45 cathode.
From: Zero-strain Mn-rich layered cathode for sustainable and high-energy next-generation batteries
a,b, [100] (a) and [\(1\bar{1}0\)] (b) zone SAED patterns of QO-NCM45. Additional electron diffraction spots distinct from those originating from the normal layered structure are marked in yellow. c, Simulated [\(1\bar{1}0\)] zone electron diffraction pattern of a layered \(R\bar{3}m\) structure. d, Schematic illustration of the atomic arrangement in Li2MnO3 viewed along the [100] and [\(1\bar{1}0\)] directions. e, Fourier transform (FT) of a 20 nm × 20 nm region of QO-NCM45. f, High-angle annular dark-field TEM images and contrast line scans along atomic columns from regions A and B of QO-NCM45. g, [100] (left) and [\(1\bar{1}0\)] (right) zone SAED patterns of QO-NCM45 after charging to 4.4 V. Additional electron diffraction spots distinct from those originating from the normal layered \(R\bar{3}m\) structure are marked with blue arrows and green circles. h, Schematic illustrations of the atomic arrangements of layered, spinel and cation-ordered structures. i, [100] (left) and [\(1\bar{1}0\)] (right) zone SAED patterns of QO-NCM45 after charging to 4.6 V. j,k, [\(1\bar{1}0\)] zone SAED patterns of QO-NCM45 after discharging to 2.7 V (j) and 100 cycles (k). SAEDs are obtained with an aperture size of 125 nm in diameter.
