Corresponding Author

Zhi-yu JIANG(zyjiang@fudan.ac.cn)


Porous nano-silicon (Si) was prepared by acid etching Al-Si alloy powder method, and used as an active material for fabricating a grapene/porous nano-Si electrode. The results of SEM and TEM measurements indicated that porous nano-Si powder was uniformly mixed with graphene by emulsification dispersion-ultrasonication method. As an anode for lithium ion battery, the graphene/porous nano-Si electrode presented relatively high performance in 1 mol•L-1 LiPF6/EC:DMC = 1:1(by volume) + 1.5% (by mass) VC solution. At the charge and discharge current densities of 0.5A•g-1, the first discharge capacity was 1768.6 mAh•g-1 with coulombic efficiency of 68.3%. The discharge capacity increased in the initial several cycles, and then decayed gradually after 7 cycles. Finally, the discharge capacity was 1842.6 mAh•g-1 with coulombic efficiency of 98.6% after 120th cycles. The excellent cycle property could be attributed to the improvement of electronic conductivity and structural stability of graphene/porous nano-Si material.

Graphical Abstract


lithium ion battery, porous Si, graphene

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