利用表面改性制备磷酸锰锂/石墨烯锂离子电池复合材料(英文)
发布时间:2021-04-19 18:48
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SiO 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Li MnPO4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 m A·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。
【文章来源】:化工学报. 2016,67(11)北大核心EICSCD
【文章页数】:8 页
【文章目录】:
Introduction
1 Experimental
1.1 Materials and chemicals
1.2 Sample preparation
(1)Synthesis of pristine Li Mn PO4
(2)Synthesis of Li Mn PO4/graphene composite
1.3 Structural characterization
1.4 Electrochemical measurements
2 Results and discussion
2.1 FTIR analysis for APS modification
2.2 XRD
2.3 SEM
2.4 TEM
2.5 Electrochemical properties
3 Conclusions
本文编号:3148109
【文章来源】:化工学报. 2016,67(11)北大核心EICSCD
【文章页数】:8 页
【文章目录】:
Introduction
1 Experimental
1.1 Materials and chemicals
1.2 Sample preparation
(1)Synthesis of pristine Li Mn PO4
(2)Synthesis of Li Mn PO4/graphene composite
1.3 Structural characterization
1.4 Electrochemical measurements
2 Results and discussion
2.1 FTIR analysis for APS modification
2.2 XRD
2.3 SEM
2.4 TEM
2.5 Electrochemical properties
3 Conclusions
本文编号:3148109
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