为了解决硅纳米材料在锂化过程中存在的体积膨胀（300%）和硅材料本身导电性不强的问题，通过在硅材料外部包覆一层有序含氮多孔碳（PNC）使其具有许多孔隙，为硅纳米颗粒的体积变化提供很大的壳体空间，有效地缓冲了硅的体积膨胀问题，从而可以维持电极的物理结构并保护电极。此外，包覆在硅材料表面的有序含氮多孔碳能够有效地解决硅导电性不强的问题，有序的碳层有利于锂离子的嵌入与脱出。Si@PNC（PNC包覆硅）硅碳复合材料在电流密度为1 A/g时循环350周之后电池的比容量维持在1 600 mAh/g左右，且在循环周期内比容量相对稳定，具有相对优异的速率能力和循环稳定性。因此，有序的含氮多孔碳可以有效地解决硅材料作为锂离子电池负极材料所面临的问题。

Silicon material is a good material for lithium-ion battery,but it cannot be widely used in commercialization due to some defects.In order to overcome the volume expansion (300%) of silicon nanomaterials in the lithiation process and the weak conductivity of silicon material itself,a layer of ordered porous nitrogen-containing carbon (PNC) is coated on the outside of silicon material to make it have many pores,supplying a large shell space to hold the volume change of silicon nanoparticles,which effectively buffers the volume expansion of silicon,thereby maintaining the physical structure of the electrode and protecting the electrode.In addition,the ordered PNC coated on the surface of silicon material can effectively solve the problem that silicon has a weak conductivity.The ordered carbon layer is favorable for the insertion and effusion of lithium ions.Si@PNC (PNC coated silicon) composite material maintains a specific capacity of about 1 600 mA·h·g^-1 after 350 cycles at a current density of 1 A·g^-1,and the specific capacity is relatively stable during the cycle,with relatively superior rate capability and cycle stability.Therefore,the ordered PNC can effectively solve the problems faced by silicon material as anode material for lithium ion battery.