A Long Cycle-Life High-Voltage Spinel Lithium-Ion Battery Electrode Achieved by Site-Selective Doping
journal contribution
posted on 2024-11-15, 21:46 authored by Gemeng Liang, Zhibin Wu, Christophe Didier, Wenchao Zhang, Jing Cuan, Baohua Li, Kuan-Yu Ko, Po Hung, Cheng Lu, Yuanzhen Chen, Grzegorz Leniec, Slawomir Kaczmarek, Bernt Johannessen, Lars Thomsen, Vanessa K Peterson, Wei Kong PangWei Kong Pang, Zaiping GuoZaiping Guo© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 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 Fd (Formula presented.) 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.