RESUMO
Lithium (Li)-metal batteries are promising next-generation energy storage systems. One drawback of uncontrollable electrolyte degradation is the ability to form a fragile and nonuniform solid electrolyte interface (SEI). In this study, we propose the use of a fluorinated carbon nanotube (CNT) macrofilm (CMF) on Li metal as a hybrid anode, which can regulate the redox state at the anode/electrolyte interface. Due to the favorable reaction energy between the plated Li and fluorinated CNTs, the metal can be fluorinated directly to a LiF-rich SEI during the charging process, leading to a high Young's modulus (~2.0â GPa) and fast ionic transfer (~2.59×10-7 â S cm-1 ). The obtained SEI can guide the homogeneous plating/stripping of Li during electrochemical processes while suppressing dendrite growth. In particular, the hybrid of endowed full cells with substantially enhanced cyclability allows for high capacity retention (~99.3 %) and remarkable rate capacity. This work can extend fluorination technology into a platform to control artificial SEI formation in Li-metal batteries, increasing the stability and long-term performance of the resulting material.
RESUMO
Tungsten oxide nanoparticles with high dispersion supported on carbon nanotube (CNT) templates were fabricated by the liquid phase method. Given the isolation effects of the network from CNT bundles, the nano-size H2WO4 and WO3 can be obtained. The photodegradation ability of the WO3/CNTs was evaluated by methylene blue (MB). The degradation rate of MB can reach 94.7% for 30 min, which is superior to that of pure WO3 at 73.1% for 30 min. Furthermore, the degradation rate of the catalyst can reach 83.7% after recycling for five times, thus displaying the excellent stability of the photocatalyst. These results may be attributed to the highly dispersed WO3 nanoparticles and the suppression of electron-hole recombination by CNT templates. This study proves that WO3/CNT photocatalysts have potential applications in environmental and other related fields.
