Silicon with higher theoretical capacity than that of the commercial graphite anode is considered as the next generation lithium ion battery anode materials. Herein, our research demonstrates that the surface SiO_x coating with silanol groups generated in aqueous solution on silicon nanoparticles can efficiently improve their electrochemical performance. The SiO_x layer can suppress the volume expansion of silicon particles, and the surficial silanol groups can also contribute to the enhanced electrochemical performance. Both coulombic efficiency and cycling stability can be improved with the optimal SiO_x coating thickness. This work provides a facile avenue of surface engineering of silicon nanoparticle for the high-performance lithium ion battery Si anode.

具有比市售石墨负极更高的理论容量的硅被认为是下一代锂离子电池负极材料。在此，我们的研究表明，在硅纳米颗粒上的水溶液中产生的具有硅烷醇基团的表面SiO _x涂层可以有效地改善其电化学性能。SiO _x层可以抑制硅颗粒的体积膨胀，并且表面的硅烷醇基团也可以有助于增强电化学性能。最佳的SiO _x涂层厚度可以提高库仑效率和循环稳定性。这项工作为高性能锂离子电池Si阳极提供了硅纳米粒子表面工程的便捷途径。