Molten Salt‐Assisted Synthesis of Single‐Crystalline Nonstoichiometric Li1+xNi1–xO2 with Improved Structural Stability

• DOI: 10.1002/aenm.202300407
• Publication Date: 2023-05-02T03:30:14Z
• Authors: Guoyu Ding; Meng Yao; Jinhan Li; Tingting Yang; Yudong Zhang; Kuiming Liu; Xinhui Huang; Zhonghan Wu; Jiayu Chen; Ziyan Wu; Jiayong Du; Changru Rong; Qi Liu; Wei Zhang; Fangyi Cheng
• Keywords: Stoichiometry

Abstract Cobalt‐free LiNiO 2 is an attractive cathode material with high energy density and low cost but suffers from severe structural degradation poor performance. Here, a molten salt‐assisted synthesis combined Li‐refeeding strategy proposed to obtain nonstoichiometric Li 1+ x Ni 1‐ O submicron particle size superior rate The slightly Li‐rich single‐crystalline characters inhibit + /Ni 2+ anti‐site defects mitigates the undesirable phase evolution. Remarkably, 1.045 0.955 exhibits specific capacity (218.7 mAh g −1 at 0.1 C), considerable capability (187.0 5 initial Coulombic efficiency (89.62% C) in 1.27 Ah pouch full cell employing graphite anode, significantly outperforming near stoichiometric . Furthermore, particulate morphology of remains intact charge voltages up 4.8 V, whereas features intragranular cracks irreversible lattice distortion. This study underscores value modification upgrade Ni‐based layered oxide materials for advanced Li‐ion batteries.