Nanotechnology

Chemical bond

Organic chemistry

Dopant

Heteroatom

Ring (chemistry)

Boron

Nickel

Density functional theory

Computational chemistry

Physical chemistry

Chemical physics

Inorganic chemistry

Chemistry

Metallurgy

Materials science

Oxide

Cathode

Optoelectronics

Doping

Angewandte Chemie International Edition

Chemical modification of electrode materials by heteroatom dopants is crucial for improving storage performance in rechargeable batteries. Electron configurations of different dopants significantly influence the chemical interactions inbetween and the chemical bonding with the host material, yet the underlying mechanism remains unclear. We revealed competitive doping chemistry of Group IIIA elements (boron and aluminum) taking nickel-rich cathode materials as a model. A notable difference between the atomic radii of B and Al accounts for different spatial configurations of the hybridized orbital in bonding with lattice oxygen. Density functional theory calculations reveal, Al is preferentially bonded to oxygen and vice versa, and shows a much lower diffusion barrier than BIII . In the case of Al-preoccupation, the bulk diffusion of BIII is hindered. In this way, a B-rich surface and Al-rich bulk is formed, which helps to synergistically stabilize the structural evolution and surface chemistry of the cathode.

Competitive Doping Chemistry for Nickel‐Rich Layered Oxide Cathode Materials