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[1]孙亚洲,陈丁琼,彭月盈,等.海藻酸水凝胶法制备锂离子电池Si/rGO/C负极材料及其电化学性能[J].厦门大学学报(自然科学版),2018,57(04):463-470.[doi:10.6043/j.issn.0438-0479.201711015]
 SUN Yazhou,CHEN Dingqiong,PENG Yueying,et al.Alginate Hydrogel-assisted Synthesis and Electrochemical Properties of Si/rGO/C Composite for Lithium-ion Battery Anode Material[J].Journal of Xiamen University(Natural Science),2018,57(04):463-470.[doi:10.6043/j.issn.0438-0479.201711015]
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海藻酸水凝胶法制备锂离子电池Si/rGO/C负极材料及其电化学性能(PDF/HTML)
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《厦门大学学报(自然科学版)》[ISSN:0438-0479/CN:35-1070/N]

卷:
57卷
期数:
2018年04期
页码:
463-470
栏目:
研究论文
出版日期:
2018-07-31

文章信息/Info

Title:
Alginate Hydrogel-assisted Synthesis and Electrochemical Properties of Si/rGO/C Composite for Lithium-ion Battery Anode Material
文章编号:
0438-0479(2018)04-0463-08
作者:
孙亚洲陈丁琼彭月盈张义永赵金保*
厦门大学 化学化工学院,固体表面物理化学国家重点实验室,新能源汽车动力电源技术国家地方联合工程实验室,福建 厦门 361005
Author(s):
SUN YazhouCHEN DingqiongPENG YueyingZHANG YiyongZHAO Jinbao*
State Key Laboratory of Physical Chemistry of Solid Surfaces,State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China
关键词:
硅基复合材料 海藻酸水凝胶 还原氧化石墨烯 负极材料 锂离子电池
Keywords:
silicon-based composite alginate hydrogel reduced graphene oxide anode composite lithium-ion battery
分类号:
TM 911
DOI:
10.6043/j.issn.0438-0479.201711015
文献标志码:
A
摘要:
硅材料具有高理论比容量(4 200 mAh/g),是最具希望的下一代锂离子电池负极材料之一,但是硅材料巨大的体积效应(> 300%)和较差的导电性严重影响其电化学性能,阻碍其实际应用.为此,采用海藻酸水凝胶充当固定剂和碳源,将硅纳米颗粒和氧化石墨烯进行组装,制备了硅/还原氧化石墨烯/碳(Si/rGO/C)复合材料,采用粉末X射线衍射(XRD)、拉曼(Raman)光谱、热重分析(TGA)、比表面积测试、扫描电镜(SEM)和透射电镜(TEM)等表征材料的结构、化学组成及形貌,并对材料进行电化学性能测试.结果表明:rGO在复合材料内部构建了分散良好的导电网络,Si纳米颗粒填充在导电网络中并通过碳层牢固地锁定在rGO片层上.rGO与碳层的复合作用有效缓冲了Si纳米颗粒在充放电时的体积变化,并且显著提高了复合材料的导电性,因此,Si/rGO/C复合材料用作锂离子电池负极时表现出优异的电化学性能:以1.0 A/g电流密度循环100圈,保持约1 000 mAh/g的高可逆比容量以及77.6%的容量保持率.
Abstract:
Silicon is generally regarded as one of the most promising anode materials of lithium-ion batteries because of its high theoretical capacity(4 200 mAh/g).However,the huge volume change(>300%)and poor electronic conductivity seriously affect its electrochemical performance and hinder its practical application.In this study,the silicon/reduced graphene oxide/carbon(Si/rGO/C)anode composite was synthesized via the alginate hydrogel process:the alginate hydrogel was used as the stabilizer and carbon source,and it bundled both the Si nanoparticles and graphene oxide(GO)together and transformed to the carbon layer after high temperature carbonization.The structure,chemical composition and morphology of the composite were characterized using powder X-ray diffraction(XRD),Raman spectrum,thermogravimetric analysis(TGA),specific surface area test,scanning electron microscopy(SEM)and transmission electron microscopy(TEM),and the electrochemical properties of the composite were tested.The results showed that inside the Si/rGO/C composites,the rGO sheets were highly disperse as a conductive network and the Si nanoparticles were firmly locked on the rGO sheets with the carbon layer.The carbon layer and rGO significantly improved the electrical conductivity of the composite,serving as a buffer for the large volume change of Si nanoparticles.The Si/rGO/C composite used as an anode material demonstrated superior electrochemical properties,which delivered a high reversible capacity of about 1 000.0 mAh/g and 77.6% capacity retention at 1.0 A/g current density after 100 cycles.

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备注/Memo

备注/Memo:
收稿日期:2017-11-18 录用日期:2018-03-15
基金项目:国家自然科学基金(21321062)
*通信作者:jbzhao@xmu.edu.cn
引文格式:孙亚洲,陈丁琼,彭月盈,等.海藻酸水凝胶法制备锂离子电池Si/rGO/C负极材料及其电化学性能[J].厦门大学学报(自然科学版),2018,57(4):463-470.
Citation:SUN Y Z,CHEN D Q,PENG Y Y,et al.Alginate hydrogel-assisted synthesis and electrochemical properties of Si/rGO/C composite for lithium-ion battery anode material[J].J Xiamen Univ Nat Sci,2018,57(4):463-470.(in Chinese)
更新日期/Last Update: 1900-01-01