Nickel‐Rich Layered Lithium Transition‐Metal Oxide for High‐Energy Lithium‐Ion Batteries

TLDR

High‑energy‑density lithium‑ion batteries are sought for portable electronics and electric vehicles, and the cathode material largely determines energy density, prompting research into Ni‑rich layered lithium transition‑metal oxides that promise higher capacity and lower cost but still face cycle life, thermal stability, and safety challenges. This review summarizes how structure tuning or interface engineering can enhance the performance of Ni‑rich cathode materials. It also discusses the underlying mechanisms and remaining challenges.

Abstract

Abstract High energy‐density lithium‐ion batteries are in demand for portable electronic devices and electrical vehicles. Since the energy density of the batteries relies heavily on the cathode material used, major research efforts have been made to develop alternative cathode materials with a higher degree of lithium utilization and specific energy density. In particular, layered, Ni‐rich, lithium transition‐metal oxides can deliver higher capacity at lower cost than the conventional LiCoO 2 . However, for these Ni‐rich compounds there are still several problems associated with their cycle life, thermal stability, and safety. Herein the performance enhancement of Ni‐rich cathode materials through structure tuning or interface engineering is summarized. The underlying mechanisms and remaining challenges will also be discussed.