Rationally optimized carbon fiber cloth as lithiophilic host for highly stable Li metal anodes

The practical application of lithium (Li) metal anode has been greatly hampered by irregular growth of Li dendrites and the volume expansion during the cycle. Constructing a three-dimensional lithiophilic porous framework is regarded as an effective solution. Here, using a CuO nanocluster arraysedecorated carbon fiber cloth (CuO-NC@CFC) to prestore Li via molten infusion has been testified to effectively resolve these bottlenecks. Impressively, after a violent melt-infusion process, the constructed nanostructures can be maintained and transformed into Cu/Li2O nanocluster arrays, together with highly conductive carbon fiber cloth, provide fast charge transport during Li stripping/plating process. As demonstrated by finite element simulations and experimental evidence, the formed Cu/Li2O nanocluster arrays not only redistribute Li+ flux and reduce local current density but also serve as Li nucleation sites. Consequently, the as-acquired Li/Cu-NC@CFC electrodes could significantly buffer volume fluctuation and regulate Li deposition behavior, exhibiting an ultrastable and ultralong lifespan (400 h at 5 mA/cm(2) with 1 mAh/cm2 Li and 800 h at 5 mA/cm(2) with 5 mAh/cm(2) Li in symmetric cells). When coupled with LiFePO4, the Li/Cu-NC@CFC electrode could deliver a high capacity of 110.3 mAh/g after 500 cycles at 2 C. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

Constructing a three-dimensional lithiophilic porous framework is an effective solution for the practical application of lithium metal anode, and pre-storing lithium using CuO nanocluster decorated carbon fiber cloth can significantly enhance electrode performance stability and play a crucial role in lithium deposition behavior.