Mitigating capacity loss and enhancing structural stability of Ni-rich cathodes for lithium-ion batteries by synergetic effect of Co and Ti doping

This study investigates the impact of Co and Ti doping on mitigating capacity loss and enhancing the structural stability of LiNiO2 cathodes at 4.3 V. LiNiO2, a nickel-rich layered oxide, offers high theoretical capacity but faces challenges such as cation mixing, structural degradation, and capacity fading under elevated voltage conditions. Co and Ti doping were systematically evaluated at 2.5%, 5.0%, and 10.0% using materials synthesized via the continuous stirred-tank reactor (CSTR) method. Structural characterization using XRD and SEM revealed that 2.5% Co and Ti doping significantly reduced cation mixing, enhanced crystallinity, and preserved the layered structure. In contrast, excessive doping at higher concentrations introduced distortions and particle agglomeration. Electrochemical evaluations demonstrated that 2.5% doping optimized capacity retention (79.0% after 100 cycles) and rate performance, outperforming undoped and highly doped samples. These findings highlight the potential of controlled doping strategies to improve the structural integrity and electrochemical performance of LiNiO2 cathodes, offering a pathway to reliable and high-energy-density lithium-ion batteries.

Journal

CHEMICAL PAPERS

Year

2026

ISSN

0366-6352

eISSN

2585-7290

DOI

10.1007/s11696-026-04688-7

WoS UID

WOS:001695065800001