A comparative study of structural changes in lithium nickel cobalt manganese oxide as a function of Ni content during delithiation process

Selective TiO2 Nanolayer Coating by Polydopamine Modification for Highly Stable Ni‐Rich Layered Oxides

“…Researchers have successfully increased the content of Ni in the cathode material of LiNi x Co y Mn 1− x − y O 2 composition and consequently obtained a high reversible capacity through the Ni redox couple (Ni 2+ →Ni 3+ →Ni 4+ ) . However, Ni‐rich layered oxides have serious issues in practical battery operation owing to the high Ni content (≥60 %), such as degradation at the surface . Moreover, their use is hampered by a charge process that is normally charged to 4.3 V (vs. Li + /Li), although charging to a higher cut‐off voltage (4.5 V) for the cathode material is crucial for achieving high energy density .…”

Improved electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode materials via incorporation of rubidium cations into the original Li sites

“…Some studies have shown that the phenomenon of this electrochemical performance degradation of NCM811 is due to the following various reasons: cation disordering, phase transformation, lattice instability, and oxygen release from cathode side reactions. [8][9][10][11][12] Particularly, cation disordering (some Ni 2+ ions of Ni layer move to Li layer) have been considered as one of the most detrimental source of failure in battery performance. Since the ionic radius of Li + (0.076 nm) is similar to that of Ni 2+ (0.069 nm), Ni 2+ can commonly exist in the Li layer.…”

Restoration of Degraded Nickel‐Rich Cathode Materials for Long‐Life Lithium‐Ion Batteries

“…The content of Ni 3+ ions is a crucial factor in determining the electrochemical properties of NRLS cathodes materials . The XPS results shown in Figure a and 3b present that the high‐resolution spectra had three prominent peaks representing Ni 3+ (855.9 eV), Ni 2+ (854.6 eV) and their satellite peak (861.6 eV) for all three different NCA materials ,.…”