Abstract
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
Keywords
lithium ion battery, porous Si, graphene
Publication Date
2015-12-23
Online Available Date
2015-09-16
Revised Date
2015-08-25
Received Date
2015-06-12
Recommended Citation
Chun-li LI, Guang YANG, Ping ZHANG, Zhi-yu JIANG.
Electrochemical Properties of Graphene/Porous Nano-Silicon Anode[J]. Journal of Electrochemistry,
2015
,
21(6): 150612.
DOI: 10.13208/j.electrochem.150612
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol21/iss6/11
