Silicon nanoparticle based anode is effective to extend cycle life by reducing pulverization of silicon particles during lithiation and de-lithiation. However, it is hard to handle nano-scale materials during a series of manufacturing processes in the industry. Particularly, during the drying process, inhomogeneous material distribution within electrode is prone to form a dense surface region by agglomeration of the nanoparticles, causing degradation of electrochemical performances. In this work, we report the effects of laser surface treatment on the dense surface region formed by heterogeneous distribution of materials within the silicon anode based on nanoparticles during the drying process. Laser surface treatment enhanced the cycle life (laser-treated, 1000 mAh g⁻¹ vs. original, 250 mAh g⁻¹ at 200 cycles), rate capability and columbic efficiency considerably. From mechanism study on physicochemical changes at the surface region during laser surface treatment, it is revealed that the characteristics of the laser-treated surface contributes to the reduction of internal resistances and thickness of the solid electrolyte interphase layer, and improves diffusion characteristics.

基于硅纳米颗粒的阳极通过减少锂化和去锂化过程中硅颗粒的粉碎，有效延长了循环寿命。但是，在工业上的一系列制造过程中很难处理纳米级材料。特别地，在干燥过程中，电极内不均匀的材料分布易于通过纳米颗粒的团聚而形成致密的表面区域，从而导致电化学性能的下降。在这项工作中，我们报告了在干燥过程中，激光表面处理对基于纳米颗粒的硅阳极内部材料的异质分布形成的致密表面区域的影响。激光表面处理提高了循环寿命（激光处理后为1000 mAh g ^-1，原始激光下为250 mAh g ^-1在200个周期内），速率能力和库仑效率显着提高。从对激光表面处理过程中表面区域的物理化学变化的机理研究中发现，激光处理表面的特性有助于减小内部电阻和固体电解质中间层的厚度，并改善了扩散特性。