Abstract

Co-free high-Ni cathode materials, which offer advantages such as high energy density and low cost, exhibit unsatisfactory cyclic life due to severe c-lattice distortion during cycling. In existing doping strategies, charge imbalance and ionic size differences with Ni3+ prevent the incorporation of high-valence dopants into primary particles during the calcination, thereby limiting their ability to suppress lattice strain. In this study, we employ a new doping strategy utilizing organic surfactants during the co-precipitation process to homogeneously position Zr4+ ions within the primary particles of LiNi0.9Mn0.1O2. Zr4+ ions located within the primary particles exerted a pillar effect, significantly enhancing the structural robustness of the material. During the first cycle, the c-lattice contraction is reduced, effectively inhibiting microcrack formation in the particles. As a result, it exhibits a significantly improved capacity retention of 98.6 % (189.2 mAh g−1) after 100 cycles.

DOI: https://doi.org/10.1016/j.mattod.2025.06.042

Link:https://www.sciencedirect.com/science/article/pii/S1369702125002846?via%3Dihub