Regulating Grind‐Induced Lattice Distortion for Nickel‐Rich Cathodes by Annealing

作者：Jinpeng Song, Lujun Huang, Guobo Yang, Tiefeng Liu, Shaoshuai Liu, Guanghui Cong, Yating Huang, Zheyuan Liu, Xiang Gao, Lin Geng · 发表于：Small Methods · 年份：2023 · DOI：10.1002/smtd.202301400 · 被引用次数：6 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

Abstract The commercialization of high‐performance nickel‐rich cathodes always awaits a cost‐effective, environmentally friendly, and large‐scale preparation method. Despite a grinding process normally adopted in the synthesis of the nickel‐rich cathodes, lattice distortion, rough surface, and sharp edge transformation inevitably occurr in the resultant samples. In this work, an additional annealing process is proposed that aims at regulating lattice distortion as well as achieving round and smoother morphologies without any structural or elemental modifications. Such a structural enhancement is favored for improved lithium diffusion and electrochemical stability during cycling. Consequently, the annealed cathodes demonstrate a considerable enhancement in capacity retention, escalating from 68.7% to 91.9% after 100 cycles at 1 C. Additionally, the specific capacity is significantly increased from 64 to 142 mAh g −1 at 5 C when compared to the unannealed cathodes. This work offers a straightforward and effective approach for reinforcing the electrochemical properties of nickel‐rich cathodes.