Double-shelled silicon anode nanocomposite materials: A facile approach for stabilizing electrochemical performance via interface construction

作者：Du, Lulu; Wen, Zhongsheng^*; Wang, Guanqin; Yang, Yan-E

来源：Journal of Physics and Chemistry of Solids, 2018, 115: 36-41.

DOI：10.1016/j.jpcs.2017.12.014

• Double-shelled configuration
• Interface
• Lithium ion battery
• Silicon composite
• Silicate transition layer

The rapid capacity fading induced by volumetric changes is the main issue that hinders the widespread application of silicon anode materials. Thus, double-shelled silicon composite materials where lithium silicate was located between an Nb2O5 coating layer and a silicon active core were configured to overcome the chemical compatibility issues related to silicon and oxides. The proposed composites were prepared via a facile co-precipitation method combined with calcination. Transmission electron microscopy and X-ray photoelectron spectroscopy analysis demonstrated that a transition layer of lithium silicate was constructed successfully, which effectively hindered the thermal inter-diffusion between the silicon and oxide coating layers during heat treatment. The electrochemical performance of the double-shelled silicon composites was enhanced dramatically with a retained specific capacity of 1030 mAh g(-1) after 200 cycles at a current density of 200 mA g(-1) compared with 598 mAh g(-1). for a core-shell Si@Nb2O5 composite that lacked the interface. The lithium silicate transition layer was shown to play an important role in maintaining the high electrochemical stability.

• 出版日期2018-4
• 单位大连海事大学