"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 Ti 3 C 2 T x /TiO 2 /La 2 O 3 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 Ti 3 C 2 T x /TiO 2 /La 2 O 3 dual heterojunction achieves remarkable capacity retention of 319 mAh g −1 after 800 cycles at 0.1 A g −1 . Notably, under elevated current density conditions (1 A g −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.