"Two-in-one" Ti3C2Tx/TiO2/La2O3 Dual Heterostructure Enables Highly Stable Lithium-Ion Battery

Two-dimensional MXene materials exhibit exceptional electrical conductivity, which has enabled their widespread utilization as highly efficient anode materials in lithium-ion batteries while demonstrating superior electrochemical characteristics. However, the structural integrity of MXene may be compromised by rapid lithium-ion intercalation, potentially resulting in diminished cycling stability. Herein, we present a dual heterostructured Ti3C2Tx/TiO2/La2O3 integrated electrode synthesized through a facile strategy. This architecture synergistically integrates the merits of individual heterostructures, substantially optimizing both electronic configuration and surface morphology of the electrode system, thereby simultaneously enhancing structural stability and energy storage performance. The optimized Ti3C2Tx/TiO2/La2O3 dual heterojunction achieves remarkable capacity retention of 319 mAh g-1 after 800 cycles at 0.1Ag-1. Notably, under elevated current density conditions (1Ag-1), the MXene-based anode demonstrates extraordinary cycling durability exceeding 10,000 cycles with 101% capacity retention. This study establishes a novel methodological paradigm for developing MXene-derived anode materials with exceptional cyclability, suggesting substantial potential for advancement in high-capacity energy storage systems and long-cycle applications within lithium-ion technologies.