Precise Phase Architecturing through Nb14W3O44/Nb6.7W10.3O47 Heterostructures Unlocks Fast-Charging Lithium-Ion Batteries with Superior Kinetics

Abstract

The development of advanced anodes with high electronic conductivity and rapid ion diffusion is critical for enabling fast-charging lithium-ion batteries. Precise phase architecture is the key to unlocking the “fast-charging” potential of niobium tungsten oxides. These materials offer a safe operating voltage and a stable framework but are hindered by inherently low electronic conductivity and limited ion diffusion. This study deliberately constructs a heterogeneous junction between Nb14W3O44 (Wadsley-Roth phase) and Nb6.7W10.3O47 (TTB phase). This precise engineering regulates the occupancy ratios of different Li+ diffusion channels and tailors the interfacial electronic structure, thereby achieving superior kinetics. The resultant Nb14W3O44/Nb6.7W10.3O47 heterojunction exhibits enhanced ionic diffusion and electronic conductivity, enabling “fast-charging” performance. A state of charge of 27.28% is reached in merely 36 s. When charged at 2.0 A g−1 (∼2.23 min), the specific capacities of 106.29 and 98.34 mAh g−1 are maintained after 2000 and 4000 cycles, respectively. This work underscores the efficacy of precise crystal configuration engineering as a powerful strategy for fabricating niobium tungsten oxide anodes with “fast-charging” performance.