Tuning Li occupancy and local structures for advanced Co-free Ni-rich positive electrodes.

ABSTRACT: Structure evolution and surface reactivity have long been regarded as the most crucial points for studying Ni-rich positive electrodes for Li-ion batteries. Unfortunately, the influence of Li occupancy as a single factor on electro-chemomechanical stability has been overlooked and is missing, owing to the challenge of Li determination in the lattice. Here, a comprehensive analysis reveals different Li occupancies and related structural domains (Ni/Li exchange, Li_aXO_b, Li/Mn/X(Ni) ordering domains, X = Nb⁵⁺, W⁶⁺, and Mo⁶⁺) by using a combination of Li-sensitive characterization techniques. By introducing a Li-regulation strategy, the relative ratio of each domain is effectively tuned in the Ni-rich positive electrodes. Through tuning, t

SUBMITTER: Li H 

PROVIDER: S-EPMC11882807 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature