Affiliation:
1. School of Materials Science and Engineering Harbin Institute of Technology BOX 433 Harbin 150001 P. R. China
2. Stake Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 P. R. China
3. College of Chemical and Biological Engineering Zhejiang University Zhejiang 310058 P. R. China
4. Center for High Pressure Science & Technology Advanced Research Beijing 100193 P. R. China
Abstract
AbstractThe 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.
Funder
National Natural Science Foundation of China
Subject
General Materials Science,General Chemistry