A highly pyrrolic-N doped carbon modified SiOx anode for superior lithium storage

Abstract

The poor interfacial stability and undesirable cycling performance caused by their dramatic volume change hinder the large-scale commercial application of SiO_x materials for high-energy-density lithium-ion batteries. Herein, a simple two-step carbonization process is employed to prepare highly pyrrolic-nitrogen-doped carbon modified SiO_x anode materials (SiO_x@NC). The designed SiO_x@NC materials exhibit high electron conductivity and favorable electrochemical kinetics_. As expected, the SiO_x@NC electrode delivers a high specific capacity of 1003.46 mA h g⁻¹ after 200 cycles at 500 mA g⁻¹. The NCM622||SiO_x@NC full cell also demonstrates excellent cycling stability and rate performance.