fig2

Figure 2. Metal oxide and fluoride surface modification for lithium oxide cathode materials. (A) Schematic of the working mechanism of AZO coating layer and improved cycling stability. Reproduced from Ref.^[75] with permission from Elsevier. (B) Cyclic performance enhancement of in situ ZrO₂-coated NCM622 cathode and scanning electron microscopy (SEM) images after 100 cycles for NCM622 with and without the coating. Reproduced from Ref.^[88] with permission from Elsevier. (C) Schematic of TiO₂ coating process for LiMn₂O₄ particles. Reproduced from Ref.^[71] with permission from the American Chemical Society. (D) Schematic of SiO₂ grafted on LRLC and its protective effects. Reproduced from Ref.^[68] with permission from the Electrochemical Society. (E) Long cycle performance of LCO with and without a LiF coating. (F) Schematic of mechanism of LiF-coated LCO. Reproduced from Ref.^[92] with permission from Elsevier. B-LCO: Bare LiCoO₂; C-LCO: coated LiCoO₂; TBOT: tetrabutyl titanate; LMO: LiMn₂O₄; LRLC: Li-rich layered cathode; FLCO-1: LiCoO₂ with 1 mol.% LiF.