[1]周 慧,王 进,许 娟,等.LiFePO4/石墨烯复合材料的电化学性能比较[J].常州大学学报(自然科学版),2013,(01):76-81.[doi:10.3969/j.issn.2095-0411.2013.01.016]
　ZHOU Hui,WANG Jin,XU Juan,et al.Comparative Study of Electrochemical Performance of LiFePO4/Graphene Composites[J].Journal of Changzhou University(Natural Science Edition),2013,(01):76-81.[doi:10.3969/j.issn.2095-0411.2013.01.016]
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LiFePO4/石墨烯复合材料的电化学性能比较()
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常州大学学报(自然科学版)[ISSN:2095-0411/CN:32-1822/N]

卷:
期数:
2013年01期
页码:
76-81
栏目:
出版日期:
2013-01-01

文章信息/Info

Title:
Comparative Study of Electrochemical Performance of LiFePO4/Graphene Composites
作者:
周 慧1; 王 进1; 许 娟1; 2; 陈智栋1; 2; 曹剑瑜1; 2
1.常州大学 石油化工学院,江苏 常州 213164; 2.江苏省太阳能电池与储能技术重点实验室, 江苏 常州 213164
Author(s):
ZHOU Hui1; WANG Jin1; XU Juan1; 2; CHEN Zhi-dong1; 2; CAO Jian-yu1; 2
1.School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China; 2.Key Laboratory for Solar Cells and Energy Storage Technology of Jiangsu Province,Changzhou 213164,China
关键词:
锂离子电池;  LiFePO4;  石墨烯;  固相法;  电化学容量
Keywords:
lithium-ion batteries;  lithium iron phosphate;  graphene;  solid-state method;  electrochemical capacity
分类号:
O 646
DOI:
10.3969/j.issn.2095-0411.2013.01.016
文献标志码:
A
摘要:
分别以水热合成的石墨烯(H-Gr)和商业化石墨烯(C-Gr)为载体,以溶胶-凝胶法合成的LiFePO4(S-LFP)和商业化的LiFePO4(C-LFP)为活性组分,通过固相法制备了4个LiFePO4/石墨烯复合物。采用X射线粉末衍射(XRD)、扫描电镜(SEM)和电化学性能测试,对上述LiFePO4/石墨烯复合物进行了对比研究。实验结果表明,C-LFP/H-Gr显示了最高的可逆放电容量,0.1 C倍率下,达到155.0 mA·h·g-1,其次是C-LFP/C-Gr(144.6 mA·h·g-1)和S-LFP/H-Gr(131.5 mA·h·g-1),S-LFP/C-Gr的性能最差,仅为119.6 mA·h·g-1。C-LFP/H-Gr较高的电化学容量,一方面可归结于商业化的LiFePO4较小的粒径和良好的晶型结构; 另一方面水热合成的石墨烯小的片层结构对LiFePO4的良好包覆,不仅增强了材料导电性,而且提高了活性物质LiFePO4的利用率。
Abstract:
Using hydrothermal-synthesized graphene(H-Gr)and commercial graphene(C-Gr)as the carries, respectively, four LiFePO4/Graphene composites were prepared by a solid-state method with sol-gel-synthesized LiFePO4(S-LFP)and commercial LiFePO4(C-LFP)as the active ingredient, respectively.The structures and electrochemical performances of those composites were investigated and compared by X-ray powder diffraction(XRD), scanning electron microscopy(SEM), and electrochemical measurements. The experimental results indicated that the C-LFP/H-Gr composite exhibited a highest reversible discharge-capacity of 155.0 mA·h·g-1 at 0.1 C rate, followed by C-LFP/C-Gr(144.6 mA·h·g-1)and S-LFP/H-Gr(131.5 mA·h·g-1),and S-LFP/C-Gr showed the lowest capacity of 119.6 mA·h·g-1 among four samples. The improved electrochemical capacity of the C-LFP/H-Gr composite might due to the smaller particle size and well-crystallized structure of commercial LiFePO4.On the other hand, LiFePO4 is well-coated by small nanosheets of hydrothermal-synthesized graphene, which not only enhanced the conductivityof composites, but also improved the utilization of the active ingredient.

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备注/Memo

备注/Memo:
基金项目:江苏省科技支撑计划基金(BE201113); 江苏省企业博士集聚计划基金(2011Z0062) 作者简介:周慧(1988-),女,安徽亳州人,硕士生; 通讯联系人:曹剑瑜。
更新日期/Last Update: 2013-01-01