A long cycle-life high-voltage spinel lithium-ion battery electrode achieved by site-selective doping

Spinel LiNi0.5Mn1.5O4 (LNMO) is a promising cathode candidate for the next-generation high energy-density lithium-ion batteries (LIBs). Unfortunately, the application of LNMO is hindered by its poor cycle stability. Now, site-selectively doped LNMO electrode is prepared with exceptional durability. In this work, Mg is selectively doped onto both tetrahedral (8a) and octahedral (16c) sites in the Fdurn:x-wiley:14337851:media:anie202001454:anie202001454-math-0001 m structure. This site-selective doping not only suppresses unfavorable two-phase reactions and stabilizes the LNMO structure against structural deformation, but also mitigates the dissolution of Mn during cycling. Mg-doped LNMOs exhibit extraordinarily stable electrochemical performance in both half-cells and prototype full-batteries with novel TiNb2O7 counter-electrodes. This work pioneers an atomic-doping engineering strategy for electrode materials that could be extended to other energy materials to create high-performance devices. © 2020 Wiley-VCH Verlag GmbH & Co

Keywords

Electric potential, Energy density, Spinels, Cathodes, Lithium ions, Electric batteries, Crystal doping

Citation

Liang, G., Wu, Z., Didier, C., Zhang, W., Cuan, J., Li, B., Ko, K.-Y., Hung, P.-Y., Lu, C.-Z., Chen, Y., Leniec, G., Kaczmarek, S. M., Johannessen, B., Thomsen, L., Peterson, V. K., Pang, W.K. & Guo, Z. (2020). A long cycle‐life high‐voltage spinel lithium‐ion battery electrode achieved by site‐selective doping. Angewandte Chemie International Edition, 59(26), 10594-10602. doi:10.1002/anie.202001454