The synthesis of micrometer-sized Li_0.08La_0.64Nb₂O₆ anode material for lithium-ion batteries via a high-temperature solid-phase method was investigated and its structure and electrochemical properties were analyzed and discussed by X-ray powder diffraction (XRD) and cyclic voltammetry (CV). Structural characterization reveals that the material crystallizes in an orthorhombic system (space group Pmmm) and its ordered A-site defect layers, synergistically coupled with the rigid ［NbO₆］ octahedral framework, construct percolating lithium-ion transport channels. Electrochemical testing results demonstrate that at a current density of 0.05 A/g, the material delivers a discharge specific capacity of 355.57 mAh/g after 100 cycles, with a capacity retention rate of 94.4%. The capacity retention remains at 84.9% after 3 000 cycles at a high rate of 1 A/g. Analysis of the pseudocapacitive contribution indicates a pseudocapacitive contribution rate of 88% at a scan rate of 1 mV/s. The kinetic index b ranges from 0.771 to 0.895, confirming that its charge storage mechanism is predominantly surface-controlled pseudocapacitance. Galvanostatic intermittent titration technique (GITT) measurements yield a lithium-ion diffusion coefficient of 5.79×10^-11 cm²/s, indicating excellent ion transport capability. The research results can provide theoretical references for the development of A-site defective niobium-based perovskite materials and their application in lithium-ion batteries.