Mitigating oxygen loss to improve the cycling performance of high capacity cation-disordered cathode materials

• DOI: 10.1038/s41467-017-01115-0
• Publication Date: 2017-10-11T14:05:32Z
• Authors: Jinhyuk Lee; Joseph K. Papp; Raphaële J. Clément; Shawn Sallis; Deok-Hwang Kwon; Tan Shi; Wanli Yang; Bryan D. McCloskey; Gerbrand Ceder
• Keywords: Capacity loss; Fluorine

Recent progress in the understanding of percolation theory points to cation-disordered lithium-excess transition metal oxides as high-capacity lithium-ion cathode materials. Nevertheless, oxygen redox processes required for these materials deliver high capacity can trigger loss, which leads formation resistive surface layers on particles. We demonstrate here that, somewhat surprisingly, fluorine be incorporated into bulk disordered lithium nickel titanium molybdenum using a standard solid-state method increase content, and that this compositional modification is very effective reducing improving energy density, average voltage, rate performance. argue valence reduction anion site, offered by incorporation, opens up significant opportunities design materials.The performance relies extent loss during cycling mitigated. Here, authors show incorporating an strategy substantially improves stability such material.