Facile Chemical Fabrication of a Three-Dimensional Copper Current Collector for Stable Lithium Metal Anodes

Abstract

Construction of three-dimensional (3D) Cu current collectors is a promising approach to improving the stability of Li metal batteries. Although many efforts have yielded fruitful results, most of them are complex, subtle, and involve high energy consumption. We present a facile chemical fabrication of a 3D current collector which offers the advantages of rapid and low cost assembly by Cu fibers. A skeleton host with a high surface activity can significantly suppress Li dendrite growth and improve the electrochemical deposition behavior of Li. Up to 7 mAh cm−2 of Li can be plated in the 3D Cu current collector without dendrite generation. Cells based on 3D Cu collectors achieved a high average Coulombic efficiency of 97% over 160 cycles (50 cycles for planar Cu) and a long cycle life of more than 900 h at 1 mA cm−2. Moreover, full cells assembled with Li-plated 3D Cu anodes and LiFePO4 cathodes displayed impressive cycling stability and rate capability at a high rate of 4C.

Effect of Laser-Textured Cu Foil with Deep Ablation on Si Anode Performance in Li-Ion Batteries

“…As shown in Figure 5d, the slope of the Cu20-D75-d15 anode's curve is the smallest, indicating the presence of the most conductive environment within the cell. This enhanced conductivity is attributed to the nanostructures and the abundant and deep microgrooves, which provide an effective pathway for electron collection and help reduce polarization [24]. tinct voltage plateau, during which the cell voltage varies slowly and the capacity inc rapidly.…”

Present and future of functionalized Cu current collectors for stabilizing lithium metal anodes

“…11(a)). Subsequently, the CuO nanofibers bundles were reduced to Cu by calcining under a reducing atmosphere (e.g., H2/Ar mixed gas) [151] or by chemical reduction (e.g., nitroaniline and ammonia borane in ethanol) [154]. The resultant Cu nanofibers with submicron in diameter show a nanosized protuberant secondary structure, which greatly increases the specific surface area for distributing the local current density of the electrode (Fig.…”

Lithiophilic Zn3N2-Modified Cu Current Collectors by a Novel FCVA Technology for Stable Anode-Free Lithium Metal Batteries

“…The first involves 3D structural modifications based on Sand’s time theory, which reduces lithium dendrite growth rate through smaller and more homogeneous surface current density, improving battery performance. Various 3D structures like Cu foam, , Cu nanowires, Cu nanocolumns, and other special 3D structures , have been applied to AFLMBs to achieve high performance. The second approach utilizes lithiophilic materials for the Cu CC modification.…”