<p>This study focuses on the development of a La-doped single-crystal Li-rich cathode material (SL-LR) to address the structural and electrochemical challenges of Li-rich layered oxides. By combining single-crystal engineering with La doping, SL-LR exhibits enhanced structural stability, reduced Li⁺/Ni²⁺ cation mixing, and expanded lithium-ion diffusion channels. The material exhibits superior electrochemical performance. After 100 cycles at a 1.0 C rate, the material retains 96.5% of its capacity, while at a 5.0 C rate, it retains 64.3%. These results demonstrate the effectiveness of this combined approach in improving the performance and cycling stability of Li-rich cathodes, providing a promising strategy for developing high-performance lithium-ion batteries.</p>