利用表面改性制备磷酸锰锂/石墨烯锂离子电池复合材料

doi:10.11949/j.issn.0438-1157.20160651

化工学报 ›› 2016, Vol. 67 ›› Issue (11): 4779-4786.DOI: 10.11949/j.issn.0438-1157.20160651

利用表面改性制备磷酸锰锂/石墨烯锂离子电池复合材料

赵兵, 王志轩, 陈卢, 杨雅晴, 陈芳, 高阳, 蒋永

上海大学环境与化学工程学院, 上海 200444

收稿日期:2016-05-11 修回日期:2016-07-21 出版日期:2016-11-05 发布日期:2016-11-05
通讯作者: 蒋永,jiangyong@shu.edu.cn
基金资助:
国家自然科学基金项目（21501119， 11575105）；上海市科委技术标准项目（15DZ0501402）。

LiMnPO₄/graphene nanocomposites with high electrochemical performancefor lithium-ion batteries

ZHAO Bing, WANG Zhixuan, CHEN Lu, YANG Yaqing, CHEN Fang, GAO Yang, JIANG Yong

Institute of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China

Received:2016-05-11 Revised:2016-07-21 Online:2016-11-05 Published:2016-11-05
Supported by:
supported by the National Natural Science Foundation of China (21501119, 11575105) and the Science and Technology Committee of Shanghai (15DZ0501402).

摘要/Abstract

摘要：

3-氨丙基三甲氧硅烷（APS）改性的磷酸锰锂纳米片与氧化石墨烯通过静电自组装，经喷雾干燥和高温煅烧，得到磷酸锰锂/石墨烯复合材料。APS修饰后的磷酸锰锂带正电荷，并可通过红外光谱中3-氨丙基和Si-O-C官能团的存在证明磷酸锰锂成功被APS修饰，使得其与带负电荷的氧化石墨烯自组装形成磷酸锰锂/石墨烯复合材料。测试结果表明约25 nm的磷酸锰锂纳米颗粒均匀负载在石墨烯表面，石墨烯片层充当导电网络，提高了材料的电子电导率和锂离子扩散速率，缓解了LiMnPO₄在充放电过程中的体积变化。电性能测试发现，该材料的首次放电比容量为142.2 mA·h·g^-1，50个循环后容量保持率达到90.5%，较未经APS修饰的磷酸锰锂/石墨烯材料有大幅提高。

关键词: 磷酸锰锂, 3-氨丙基三甲氧硅烷改性, 纳米材料, 复合材料, 电化学

Abstract:

A high performance LiMnPO₄/graphene nanocomposite as cathode material for lithium-ion batteries was prepared via surface modification of 3-aminopropyltrimethoxysilane (APS) on LiMnPO₄ nanoparticles and electrostatic self-assembly of positively charged APS-LiMnPO₄ nanoparticles and negatively charged graphene oxide. Successful APS modification on LiMnPO₄ was demonstrated by the existence of 3-aminopropyl and Si-O-C groups in FTIR spectra. LiMnPO₄ nanoparticles (ca. 25 nm) were found uniformly distributed on the surface of graphene sheets. The intimate contact of LiMnPO₄ nanoparticles with graphene conductive network allows achieving fast electron transfer between the active material and charge collector and accommodating volume expansion/contraction of LiMnPO₄ nanoparticles during electric discharge/charge process. The nanocomposite cathode material could deliver an initial capacity of 142.2 mA·h·g^-1 at 0.05 C and maintain 90.5% capacity after 50 cycles, which were significant better than no APS-modified counterpart.

Key words: lithium manganese phosphate, aminopropyltrimethoxysilane modification, nanomaterials, composites, electrochemistry

中图分类号:

O646

赵兵, 王志轩, 陈卢, 杨雅晴, 陈芳, 高阳, 蒋永. 利用表面改性制备磷酸锰锂/石墨烯锂离子电池复合材料[J]. 化工学报, 2016, 67(11): 4779-4786.

ZHAO Bing, WANG Zhixuan, CHEN Lu, YANG Yaqing, CHEN Fang, GAO Yang, JIANG Yong. LiMnPO₄/graphene nanocomposites with high electrochemical performancefor lithium-ion batteries[J]. CIESC Journal, 2016, 67(11): 4779-4786.

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利用表面改性制备磷酸锰锂/石墨烯锂离子电池复合材料

LiMnPO₄/graphene nanocomposites with high electrochemical performancefor lithium-ion batteries

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利用表面改性制备磷酸锰锂/石墨烯锂离子电池复合材料

LiMnPO4/graphene nanocomposites with high electrochemical performancefor lithium-ion batteries

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LiMnPO₄/graphene nanocomposites with high electrochemical performancefor lithium-ion batteries