Facile preparation of hierarchical 3D current collector for Li-ion anodes

We have developed fast and scalable method of 3D current collector preparation for Li-ion negative electrode. The set-up procedure was optimized by variation of electroplating solution composition, deposition charge and current density. The obtained 3D structure show interconnected, branched dendrite microstructure, along with large pits macrostructure generated by ongoing hydrogen co-evolution. The best deposition conditions resulted with smooth dendrite termination and large amount of macro-pits were established. The sample of the best electrochemical properties was prepared by using 0.2 M CuSO 4 /1.6 M H 2 SO 4 plating solution and 2.0 A cm −2 current density. After covering by Si-based slurry the 3D current collector based electrodes showed excellent cycling stability in the Li-ion battery. The capacity fade was as low as 0.2% per cycle. The main reasons for such extraordinary stability was attributed to better mechanical stabilization of the active layer by copper dendrite structure, which was proven by the EIS results. As the side effect of the layer mechanical stability, the SEI growth was diminished leading to lower internal resistance buildup along cycling. Designed 3D current collector, as one of the few described in the literature, is capable of sufficient active material loading, and can be directly covered by active layer by slurry coating. The combination of those two factors lead to possibility of direct application in the commercial batteries.The dataset includes:1) publication in Electrochimica Acta (pdf format can be open in Adobe Acrobat)2) electrochemical procedures for examination of the electrochemical properties of the electrodes prepared on 3D current collector (.cpw and .zpw format can be open by Atlas Sollich software: https://atlas-sollich.pl/; for simplified view a software which reads simple text files, such as Notepad, can be used)3) microscopic images of 3 D current collector (.tif format can be open by any appropriate application e.g. Windows Image Viewer)Files #2 and #3 are used in publication presented in file #1