Journal
APPLIED SURFACE SCIENCE
Volume 604, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.154578
Keywords
Aqueous zinc-ion batteries; LGP; Self-supported cathode; K(+ )ion pre-intercalation; High specific capacity
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Funding
- Department of Science and Tech- nology of Sichuan Province [2019ZDZX0029, 2020ZHCG0035]
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Aqueous zinc-ion batteries (ZIBs) have garnered significant attention for their advantages of high safety, low cost, environmental friendliness, and suitability for large-scale energy storage systems. However, the development and application of ZIBs face challenges such as sluggish reaction kinetics, low electrical conductivity, and unstable cathode materials. In this study, a self-supporting cathode with K+ intercalated MnO2 on a three-dimensional carbon-based conductive substrate was synthesized, demonstrating improved stability, conductivity, and ion diffusion. The obtained cathode exhibited high specific capacity and excellent cycling stability, making it a promising candidate for ZIBs.
Aqueous zinc-ion batteries (ZIBs) have attracted extensive research interest due to their multiple advantages, such as high safety, low cost, environmental friendliness, and suitability for large-scale energy storage systems. However, the further development and application of ZIBs is hindered by the sluggish reaction kinetics, low electrical conductivity, and unstable crystal structure of cathode materials. Here, a self-supporting cathode of K+ intercalated MnO2 on three-dimensional layered carbon-based conductive substrate (LGP) (LGP@K0.15MnO2) without binder and conductive agent was synthesized by two simple steps. The synergistic effect of the three-dimensional layered carbon conductive network and pre-intercalated K+ ions in LGP@K0.15MnO2 can effectively stabilize the material structure, promote electrical conductivity, and facilitate ion diffusion. Therefore, the obtained LGP@K0.15MnO2 exhibited a high specific capacity and excellent cycling stability, which delivered 358.9 mAh/g for the first cycle at a current density of 200 mA/g, and maintained 92.5% of the capacity after 100 cycles. In addition, a capacity retention rate of 83.3% after 1000 cycles at 1000 mA/g was obtained. It was also found that the pre-intercalation of excess K+ ions would adversely affect the crystal structure and electrochemical performance of cathode materials.
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