Lithium‐Metal Anodes Working at 60 mA cm⁻² and 60 mAh cm⁻² through Nanoscale Lithium‐Ion Adsorbing

Abstract

Achieving high-current-density and high-areacapacity operation of Li metal anodes offers promising opportunities for high-performing next-generation batteries. However, high-rate Li deposition suffers from undesired Liion depletion especially at the electrolyte-anode interface, which compromises achievable capacity and lifetime. Here, electronegative graphene quantum dots are synthesized and assembled into an ultra-thin overlayer capable of efficient Liion adsorbing at the nanoscale on Li-metal to fully relieve Liion depletion. The protected Li anode achieves long-term reversible Li plating/stripping over 1000 h at both superior current density of 60 mA cm À2 and areal capacity of 60 mAh cm À2 . Implementation of the protected anode allows for the construction of Li-air full battery with both enhanced rate capability and cycling performance.

Fluorescent Fiber-Shaped Aqueous Zinc-Ion Batteries for Bifunctional Multicolor-Emission/Energy-Storage Textiles

“…Due to the presence of plentiful functional groups on the surface of B-CDs and the stable existence in aqueous ZnSO 4 electrolyte, it can be used as an additive to the stable Zn anode. The interaction between different functional groups of B-CDs and Zn 2+ (zincophilic sites) is explored with the assistance of density functional theory (DFT) calculation. , The simplified graphene structure endowed with multiple functional groups is chosen to observe the Zn deposition behavior by calculating the adsorption energy of a single ionic Zn on the surface of the Zn metal (Figure S10). As shown in Figure i, the calculated adsorption energy of Zn 2+ on the hydrophilic groups (around −1.85 eV) is adequately lower than that on the Zn substrate (−0.62 eV), indicating the strong binding energy between B-CDs with Zn metal, which can facilitate the stable enrichment of Zn 2+ around B-CDs (Figure S4) and the improvement of nucleation sites.…”

Application of Inorganic Quantum Dots in Advanced Lithium–Sulfur Batteries

“…This LAL layer could selectively adsorb the Li + -ion flux at the electrolyte-anode interface, and make Li + ions evenly distributed and homogenously deposited during the charging process, as shown in Figure 13d. [175] Furthermore, the LAL-modified GQDs could also increase the local Li + concentration at the interface preferentially, so as to restrict any depletion of Li + ions at high current densities. Benefiting from these advantages, the modified Li-metal anodes realized a long-term reversibility for Li plating/stripping, over 1000 h at a high current density of 60 mA cm −2 , as shown in Figure 13e.…”

“…e) Galvanostatic cycling profiles of symmetric cells with the LAL/Li electrode or bare Li electrode. Reproduced with permission [175]. Copyright 2021, Wiley-VCH.…”

In‐Situ Constructing A Heterogeneous Layer on Lithium Metal Anodes for Dendrite‐Free Lithium Deposition and High Li‐ion Flux

“…Many attempts are devoted to designing SEI films for favoring Li + transport and accelerating the kinetics. Ye et al [12] . designed a film on the surface of Li metal anode with electronegative quantum dots possessing a strong Li + affinity.…”