Synergistic nanostructure and heterointerface design propelled ultra-efficient in-situ self-transformation of zinc-ion battery cathodes with favorable kinetics
RIS ID
146633
Abstract
© 2020 Elsevier Ltd In-situ self-transformation is proved to be an effective strategy to design high-performance cathodes for aqueous zinc-ion batteries (ZIBs). However, the inferior transformation efficiencies during phase transition limit its further application. Herein, a 3D spongy VO2-graphene (VO2-rG) precursor has been designed for achieving the ultra-efficient in-situ self-transformation process from VO2-rG into multifaceted V2O5·nH2O-graphene composite (VOH-rG). Benefiting from the highly conductive heterointerfaces, rich reaction sites and numerous ions diffusion channels of VO2-rG, almost 100% VO2 nanobelts are converted into VOH during the first charging with few side reactions, indicating a highly efficient transformation kinetics. This strategy enables structural modulation from micro-nano level to molecular level by integrating pre-inserted H2O molecules and constructing 3D porous heterogeneous architecture into the VOH-rG cathode simultaneously, leading to fast and enduring Zn2+ (de)intercalation kinetics. Consequently, the VOH-rG cathode exhibits high capacity of 466 mA h g−1 at 0.1 A g−1, superior rate performance (190 mA h g−1 even at 20 A g−1) and excellent cycling stability with 100% capacity retention over 5000 cycles. Moreover, the assembled VOH-rG//Zn flexible quasi-solid-state batteries also present impressive performance. Such an ultra-efficient in-situ self-transformation strategy would pave a new way to explore promising electrode materials for advanced energy storage.
Publication Details
Luo, H., Wang, B., Wu, F., Jian, J., Yang, K., Jin, F., Cong, B., Ning, Y., Zhou, Y., Wang, D., Liu, H. & Dou, S. (2021). Synergistic nanostructure and heterointerface design propelled ultra-efficient in-situ self-transformation of zinc-ion battery cathodes with favorable kinetics. Nano Energy, 81