リチウムイオン電池正極材料Li(Ni<sub>1/3</sub>Co<sub>1/3</sub>Mn<sub>1/3</sub>)O<sub>2</sub>の劣化解析

We report detailed studies of capacity deterioration mechanism of Li[Ni1/3Co1/3Mn1/3]O2 (NCM) cathode after several numbers of cycling with the voltage range of 3.0–4.1 V/cell at 85 °C and after storage at charged states (3.7, 4.0 and 4.1 V/cell) at 70 °C for 150 days by soft X-ray absorption spectroscopy (XAS) and X-ray powder diffraction (XRD). Morphological changes were also observed by scanning electron microscopy (SEM).