Bi-functional poly(vinylidene difluoride) coated Al anodes for highly rechargeable aqueous Al-ion batteries

Recent progress in aluminum anodes for high-performance rechargeable aqueous Al-ion batteries

“…Hao et al developed a polyvinylidene fluoride (PVDF) coating that inhibits the formation of free H 2 O/O 2 species and mitigates corrosion problems. 44 Theoretical calculations confirmed a strong interaction between PVDF and Al 3+ via F–Al bonds for the observed uniform Al deposition. The results show that the PVDF–Al/K 2 CoFe(CN) 6 cell achieves a coulombic efficiency of 98.2% after 400 cycles at a current density of 0.1 A g −1 .…”

Highly Stable Al Metal Anode Enabled by Surface Chemical Passivation for Long-Life Aqueous Al Metal Batteries

“…After 600 cycles, the treated Al/CuHCF cell shows high CEs of approximately 98.0% (Figure S16). We have also compared the cycling stability and capacity retention of our work with other state-of-the-art AIBs as shown in Figure S17. ,,,,− Compared with other reported aqueous AMBs, treated Al-based cells in our work exhibit more advantages in cycle stability and capacity retention. These results suggest that the conversion layer can effectively impede Al corrosion and facilitate uniform Al deposition, eventually leading to enhanced reversibility and lifespan of aqueous AMBs.…”

High‐Voltage Deep Eutectic Solvent Electrolyte with Fluorine‐Substituted Acetamide Additive for Aluminum‐ion Battery

“…It has been widely reported that metal fluorides can protect the metal anode against diverse side reactions. [ 41,42,53 ] Here, the formation of the AlF x ‐rich layer suggests the important role of the F‐substituted AcA in tailoring the interfacial electrochemistry of Al electrode. It is often considered that the Al 2 O 3 layer can increase the surface resistance, reduce the area for the electrochemical reaction, and hinder the transfer of aluminum chloride complex to the Al surface.…”

“…The exchange current densities ( j 0 ) could be obtained from the Tafel plots, reflecting the intrinsic electron transfer rate of the Al conversion. [ 41–44 ] The Al electrode in AlCl 3 /AcA‐0.03dFAcA shows higher exchange current densities for both the cathodic (0.58 mA cm −2 ) and anodic (0.14 mA cm −2 ) processes when compared with that in AlCl 3 /AcA (cathodic 0.57 mA cm −2 and anodic 0.13 mA cm −2 ). The increased j 0 values demonstrated faster charge transfer induced by the dFAcA additive.…”