Abstract
The pursuit of electrochemical energy storage has led to a pressing need on materials with high capacities and energy densities; however, further progress is plagued by the restrictive capacity (372 mAh g−1) of conventional graphite materials. Tungsten trioxide (WO3)-based anodes feature high theoretical capacity (693 mAh g−1), suitable potential, and affordable cost, arousing ever-increasing attention and intense efforts. Nonetheless, developing high-performance WO3 electrodes that accommodate lithium ions remains a daunting challenge on account of sluggish kinetics characteristics and large volume strain. Herein, the well-designed hierarchical WO3 agglomerates assembled with straight and parallel aligned nanoribbons are fabricated and evaluated as an anode of lithium-ion batteries (LIBs), which exhibits an ultra-high capacity and excellent rate capability. At a current density of 1,000 mA g−1, a reversible capacity as high as 522.7 mAh g−1 can be maintained after 800 cycles, corresponding to a high capacity retention of ∼80%, demonstrating an exceptional long-durability cyclic performance. Furthermore, the mechanistic studies on the lithium storage processes of WO3 are probed, providing a foundation for further optimizations and rational designs. These results indicate that the well-designed hierarchical WO3 agglomerates display great potential for applications in the field of high-performance LIBs.
Highlights
The commercialization of electrochemical energy storage (EES) systems, especially lithium-ion batteries (LIBs), has brought revolutionary changes in the industrial structure of energy storage (Abakumov et al, 2020; Liu L. et al, 2020; Eum et al, 2020; Gao et al, 2020)
In light of the above consideration, the well-designed WO3 agglomerates assembled with straight and parallel aligned nanoribbons are prepared via a one-step hydrothermal method for high-performance LIBs
Benefiting from the unique hierarchical structure of WO3 agglomerates with high electrode–electrolyte contact area, short Li-ion pathway, and good strain accommodation, the electrode exhibits dramatically enhanced Li-ion storage properties in cyclic stability, specific capacity concurrently, along with a high capacity retention of ~80% (661.5 mAh g−1 for initial discharge and 522.7 mAh g−1 after 800 cycles at 1,000 mA g−1), remarkably higher than those of the state-of-the-art WO3-based anodes
Summary
The commercialization of electrochemical energy storage (EES) systems, especially lithium-ion batteries (LIBs), has brought revolutionary changes in the industrial structure of energy storage (Abakumov et al, 2020; Liu L. et al, 2020; Eum et al, 2020; Gao et al, 2020). In light of the above consideration, the well-designed WO3 agglomerates assembled with straight and parallel aligned nanoribbons are prepared via a one-step hydrothermal method for high-performance LIBs. Benefiting from the unique hierarchical structure of WO3 agglomerates with high electrode–electrolyte contact area, short Li-ion pathway, and good strain accommodation, the electrode exhibits dramatically enhanced Li-ion storage properties in cyclic stability, specific capacity concurrently, along with a high capacity retention of ~80% (661.5 mAh g−1 for initial discharge and 522.7 mAh g−1 after 800 cycles at 1,000 mA g−1), remarkably higher than those of the state-of-the-art WO3-based anodes. The cyclic voltammetry (CV) and electrochemical impedance spectroscopic (EIS) curves were conducted on an electrochemical workstation (IVIUM technologies, Vertex)
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