Co-modification by LiAlO2-coating and Al-doping for LiNi0.5Co0.2Mn0.3O2 as a high-performance cathode material for lithium-ion batteries with a high cutoff voltage

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

“…In contrast, the TiO 2 ‐PNCM electrode after the long‐term cycling in Figure (d) exhibits a lower‐intensity NiO peak, and it dominantly shows the Ni 3+ peak compared with the bare NCM electrode. According to previous reports, the surface instability of Ni‐rich layered oxides, such as side reactions and NiO formation during high‐voltage operation, causes severe damage on secondary particles. After cycling in the potential range of 3.0–4.5 V, the particle of the bare NCM was seriously collapsed and fractured, as shown in Figure (e), whereas the secondary particle of the TiO 2 ‐PNCM [Figure (f)] maintained its spherical morphology.…”

Modulating Crystal and Interfacial Properties by W‐Gradient Doping for Highly Stable and Long Life Li‐Rich Layered Cathodes

“…These results also reveal a decrease in the degree of cation mixing. [ 12a,21 ] More powerful WO bond (≈598–632 kJ mol −1 ) than that of TMO (MnO: ≈ 402 kJ mol −1 , NiO: ≈391.6 kJ mol −1 ) can bind the TMO slabs to prevent TM ions from migrating into Li‐slabs, indicating that the W modification has a positive impact on cation ordering.…”

Recent Developments of Nanomaterials and Nanostructures for High‐Rate Lithium Ion Batteries

“…[301] In order to fulfil the increasing demand for cathode material with excellent electrochemical properties, various modification approaches are often combined together to improve the performance of lithium nickel manganese cobalt oxides. [302] As an example, F127-assisted fluorine doped lithium nickel manganese cobalt oxide (F127-NCMF) was synthesised by a facile co-precipitation procedure developed by Li et al [303] In detail, an aqueous solution of F127 (a type of non-ionic surfactant) and Na 2 CO 3 was added into the metal salt solution containing Ni (CH 3 COOH) 2 • 4H 2 O, Co(CH 3 COOH) 2 • 4H 2 O and Mn (CH 3 COOH) 2 • 4H 2 O, which was then followed by a series of cleaning steps (filtering, washing and drying) to produce the precursor (F127-Ni 0.5 Co 0.2 Mn 0.3 CO 3 ), as shown in Figure 30c. Subsequently, fluorine doping was performed by two successive heat treatments (450°C for 5 h and 850°C for 12 h) with the additional lithium source (Li 2 CO 3 and LiF).…”