作者:Luo, Z (Luo, Zheng)[1 ]; Xu, JC (Xu, Jincheng)[1 ]; Yuan, B (Yuan, Bin)[1,2 ]; Hu, RZ (Hu, Renzong)[1,2 ]; Yang, LC (Yang, Lichun)[1,2 ]; Gao, Y (Gao, Yan)[1,2 ]; Zhu, M (Zhu, Min)[1,2 ]
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出版年:JUL 4 2018
文献类型:Article
A 3D porous Cu current collector used in Li-ion batteries can improve the cycling performance of Sn anodes with high specific capacity because of the accommodation of large volume expansion by the pores. However, the pure Cu ligament is too soft to endure enough stress from volume expansion, and then it leads to the fast fade of capacity because of the formation of cracks or the collapse of the 3D porous structure. In this study, a novel micro-nano 3D hierarchical porous Cu-based composite current collector with enhanced ligaments has been fabricated by one-step dealloying of the Cu-34Zn-6Al (wt %) precursor and subsequent heat treatment. The pore and microstructure evolutions during dealloying and heat treatment have been studied by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. To confirm the validity of the 3D porous Cu/beta/gamma composite current collector, Sn has been directly electroless plated on it in comparison with the porous pure Cu and the common Cu foil. It is found that the Sn-coated 3D hierarchical porous Cu/beta/gamma composite current collector with higher hardness shows significantly improved cycling stability compared with the Sn-coated 3D porous Cu current collector and the planar copper foil.
作者关键词:dealloying; current collector; Li-ion battery; Sn anode; hierarchical pores
KeyWords Plus:THIN-FILMS; LITHIUM; PERFORMANCE; ALLOY; TIN; NANOPARTICLES; EVOLUTION; COPPER; ELECTRODES; CAPACITY
通讯作者地址:Yuan, B (通讯作者)
 | South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China. |
| South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510640, Guangdong, Peoples R China. |
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电子邮件地址:apsheng@scut.edu.cn
| 基金资助机构 | 授权号 |
|---|---|
| Foundation for National Natural Science Foundation of China | 51571090 51671088 |
| Foundation for Innovative Research Groups of National Natural Science Foundation of China | 51621001 |
| Training Program of Major Basic Research Project of Provincial Natural Science Foundation of Guangdong | 2017B030308001 |
| Fundamental Research Funds for the Central Universities | 2017ZD009 |