Silicon/carbon composite microspheres with hierarchical core-shell structure as anode for lithium ion batteries

被引:56
作者
Li, Shuo [1 ,2 ,3 ]
Qin, Xianying [1 ,2 ]
Zhang, Haoran [1 ,2 ,3 ]
Wu, Junxiong [1 ,2 ,3 ]
He, Yan-Bing [1 ,2 ]
Li, Baohua [1 ,2 ]
Kang, Feiyu [1 ,2 ,3 ]
机构
[1] Tsinghua Univ, Grad Sch Shenzhen, Engn Lab Next Generat Power & Energy Storage Batt, Shenzhen 518055, Peoples R China
[2] Tsinghua Univ, Grad Sch Shenzhen, Engn Lab Functionalized Carbon Mat, Shenzhen 518055, Peoples R China
[3] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
基金
中国博士后科学基金;
关键词
Si/C anode; Core-shell structure; Electrochemical properties; Lithium ion battery; Spray drying; HIGH-CAPACITY ANODE; NEGATIVE ELECTRODES; C COMPOSITE; BINDER;
D O I
10.1016/j.elecom.2014.10.013
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Silicon/carbon composite microspheres with hierarchical core-shell structure were prepared by spray drying polyvinyl alcohol (PVA) solution containing silicon (Si) nanoparticles, followed by surface coating with polyacrylonitrile (PAN) and heat treatment. For the hierarchical structure, the core section (Si/po-C) was composed of PVA-based porous carbon framework and the embedded Si nanoparticles, and the desired Si/po-C@C microspheres were formed by encapsulating the Si/po-C core with PAN-based carbon shell. The Si/po-C@C anode gave rise to stable cycling performances with high capacity and excellent rate capability attributed to the hierarchical structure. The compact PAN-based carbon shell was able to block electrolyte to contact with Si effectively, promoting the formation of stable solid-electrolyte interphase. The porous carbon framework could accommodate the volume change of embedded Si nanopartides and enhance the internal conductivity. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:98 / 102
页数:5
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