Electrospun core-shell silicon/carbon fibers with an internal honeycomb-like conductive carbon framework as an anode for lithium ion batteries

被引:119
作者
Zhang, Haoran [1 ,2 ]
Qin, Xianying [1 ,2 ]
Wu, Junxiong [1 ,2 ]
He, Yan-Bing [1 ]
Du, Hongda [1 ]
Li, Baohua [1 ]
Kang, Feiyu [1 ,2 ]
机构
[1] Tsinghua Univ, Grad Sch Shenzhen, Engn Lab Functionalized Carbon Mat, Engn Lab Next Generat Power & Energy Storage Batt, Shenzhen 518055, Peoples R China
[2] Tsinghua Univ, Sch Mat Sci & Engn, Lab Adv Mat, Beijing 100084, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
NEGATIVE ELECTRODES; ENERGY-STORAGE; RECHARGEABLE BATTERIES; SI NANOPARTICLES; PERFORMANCE; NANOFIBERS; COMPOSITE; CAPACITY; DESIGN; OXIDE;
D O I
10.1039/c4ta06044j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Core-shell silicon/carbon (Si/C) fibers with an internal honeycomb-like carbon framework are prepared based on the coaxial electrospinning technique. For this hierarchical structure, the fiber's core is composed of a porous carbon framework and embedded Si nanoparticles, which is further wrapped by a compact carbon shell. The well-defined Si/C composite anode shows high specific capacities, good capacity retention, and high accessibility of Si in lithium-ion batteries. An initial reversible capacity of 997 mA h g(-1) and a capacity retention of 71% after 150 cycles are demonstrated with a current density of 0.2 A g(-1). At a higher current density of 0.5 A g(-1), a reversible capacity of 603 mA h g(-1) can be maintained after 300 cycles. The accessibility of Si in the Si/C anode is up to 3612 mA h g(-1) in the 1st cycle. The excellent electrochemical properties are attributed to the hierarchical structure of Si/C fibers. The porous carbon framework in the core region could not only accommodate the volume expansion of Si, but also enhance the conductivity inside these fibers. The compact carbon shell is able to prevent the electrolyte from permeating into the core section, therefore a stable solid-electrolyte interphase can be formed on the fiber surface.
引用
收藏
页码:7112 / 7120
页数:9
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