Abstract
As a candidate for commercial cathode material of aqueous zinc ion batteries (AZIBs), vanadium-based materials have attracted wide attention due to their unique layered structure and high specific capacity. However, the insertion/extraction process of Zn2+ can easily lead to the volume expansion of vanadium-based materials, resulting in battery failure. In addition, the inherent low conductivity and low diffusion kinetics of vanadium-based materials limiting their further development into high-performance cathode materials. Herein, a novel V6O13/N, O co-doped carbon (V6O13/C) nanorod electrode material has been successfully fabricated as a cathode for AZIBs. The N, O co-doped carbon can significantly improve the conductivity of materials and alleviate the volume change. The nanorod-like structure could enhance the structural stability during the Zn2+ insertion/extraction processes. Moreover, with N, O doped, the electrode can expose more reactive sites which is beneficial for promoting electrochemical processes. With the synergistic effort of the above optimization strategy, the as-obtained electrode delivers excellent long-term cycle stability of 151.7 mAh g−1 at 1 A g−1 after 1000 cycles.
Published Version
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