石墨烯/多孔纳米硅负极的电化学性能

doi:10.13208/j.electrochem.150612

电化学（中英文） ›› 2015, Vol. 21 ›› Issue (6): 572-576. doi: 10.13208/j.electrochem.150612

石墨烯/多孔纳米硅负极的电化学性能

李纯莉¹，杨广¹，张平¹，江志裕²*

1. 上海空间电源研究所，上海 200245；2. 复旦大学化学系，上海 200433

收稿日期:2015-06-12 修回日期:2015-08-25 出版日期:2015-12-23 发布日期:2015-09-16
通讯作者: 江志裕 E-mail:zyjiang@fudan.ac.cn

Electrochemical Properties of Graphene/Porous Nano-Silicon Anode

LI Chun-li¹, YANG Guang¹, ZHANG Ping¹, JIANG Zhi-yu²*

1. Shanghai Institute of Space Power Sources, Shanghai 200245, China; 2. Department of Chemistry, Fudan University, Shanghai 200433, China

Received:2015-06-12 Revised:2015-08-25 Published:2015-12-23 Online:2015-09-16
Contact: JIANG Zhi-yu E-mail:zyjiang@fudan.ac.cn

摘要/Abstract

摘要：

采用酸浸蚀Al-Si合金的方法制备了多孔纳米Si，并用其制作以石墨烯为导电材料的石墨烯/多孔纳米Si负极. SEM和TEM的分析表明两者混合均匀. 作为锂离子电池的负极，该电极在1 mol•L^-1 LiPF₆/EC(碳酸乙烯酯):DMC(碳酸二甲酯) = 1:1(by volume) + 1.5%(by mass)VC(碳酸亚乙烯酯)溶液中、0.5 A•g^-1电流密度下，第120周循环的放电比容量为1842.6 mAh•g^-1，充放电效率为98.6%. 石墨烯的加入不仅提高了电极的导电性，而且减缓了充放电过程中电极多孔纳米结构的衰变.

关键词: 锂离子电池, 多孔硅, 石墨烯

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.

Key words: lithium ion battery, porous Si, graphene

中图分类号:

O646

李纯莉，杨广，张平，江志裕. 石墨烯/多孔纳米硅负极的电化学性能[J]. 电化学（中英文）, 2015, 21(6): 572-576.

LI Chun-li, YANG Guang, ZHANG Ping, JIANG Zhi-yu. Electrochemical Properties of Graphene/Porous Nano-Silicon Anode[J]. Journal of Electrochemistry, 2015, 21(6): 572-576.

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石墨烯/多孔纳米硅负极的电化学性能

Electrochemical Properties of Graphene/Porous Nano-Silicon Anode

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