Ultrafine Li3VO4 Decorated Porous Carbon Framework Hybrids for Long-Life and Fast Lithium Storage
摘要
Li3VO4 (LVO) has emerged as a competitive anode candidate for lithium-ion batteries due to its favorable discharge plateau and structural stability. Nevertheless, conventional LVO materials face a critical tradeoff between the particle size reduction for enhanced reactivity and the inevitable formation of surface defects that compromise cycling durability. Herein, we develop a freeze-drying strategy to insert the fine LVO particles into porous carbon architectures (ps-LVO/C). The resulting three-dimensional network not only establishes shorten ion diffusion channels, but also stabilizes the ultrafine LVO, which synergistically enhances both energy storage capacity and cycling stability. As a result, the ps-LVO/C anode delivers a remarkable discharge capacity of 649 mAh g−1 at 0.5 A g−1, while maintaining near-perfect coulombic efficiency for more than 100 cycles without observable capacity degradation. Remarkably, the electrode withstands rigorous current density fluctuations, maintaining 618.4 mAh g−1 at 0.5 A g−1 after two ultrahigh-rate cycles at 10 A g−1, demonstrating excellent capacity recovery. Under extreme cycling conditions (10/8 A g−1), the porous architecture ensures outstanding stability, retaining 362.9 mAh g−1 after 1500 cycles. This work provides fundamental insights into balancing surface reactivity and structural integrity through morphological engineering.