Understanding the Rate Capability of High‐Energy‐Density Li‐Rich Layered Li 1.2 Ni 0.15 Co 0.1 Mn 0.55 O 2 Cathode Materials

The high‐energy‐density, Li‐rich layered materials, i.e., x LiMO 2 (1‐ x )Li 2 MnO 3 , are promising candidate cathode materials for electric energy storage in plug‐in hybrid electric vehicles (PHEVs) and electric vehicles (EVs). The relatively low rate capability is one of the major problems that need to be resolved for these materials. To gain insight into the key factors that limit the rate capability, in situ X‐ray absorption spectroscopy (XAS) and X‐ray diffraction (XRD) studies of the cathode material, Li 1.2 Ni 0.15 Co 0.1 Mn 0.55 O 2 [0.5Li(Ni 0.375 Co 0.25 Mn 0.375 )O 2 ·0.5Li 2 MnO 3 ], are carried out. The partial capacity contributed by different structural components and transition metal elements…

• UD
  U.S. Department of Energy
• AN
  Argonne National Laboratory