Abstract
Although Ni-rich layered oxide cathode materials of Li-ion batteries can provide high energy density, their performance degradation over long cycling and safety hazard due to their intrinsic property issues limit their practical long-term applications. Herein, we introduce a concept based on Ni-rich NMC811 core@quasi-solid shell structure. The Li-rich quasi-solid shell material was prepared by infusing 2 M LiTFSI in [EMIM][TFSI] into a whole pore of Al2O3 nanoparticles delivering a high ionic conductivity (2.8 × 10−4 S cm−1) at room temperature (25 °C). Then the shell material with a thickness of ca. 200 nm below a “Play Dough-like” state was coated on NMC811 using a green and scalable mechanofusion process. The 18650 cylindrical Li-ion battery cells using the core-shell cathode and the graphite anode at a pilot-plant manufacturing scale exhibit considerable high-rate capability compared to the pristine NMC811, especially at a high C-rate. The post-mortem analysis demonstrated that with the thick semi-solid shell there is no transition metal dissolution. Also, the battery cells retained a high discharge capacity after long-term cycling without any safety hazards. We believe that the semi-solid encapsulation in this work may be useful for next-generation high-energy Ni-rich Li-ion batteries.
Funder
Office of National Higher Education Science Research and Innovation Policy Council
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献