Dual-Porosity SiO2/C Nanocomposite with Enhanced Lithium Storage Performance

被引:114
作者
Li, Huan-Huan [1 ]
Wu, Xing-Long [1 ]
Sun, Hai-Zhu [1 ]
Wang, Kang [1 ]
Fan, Chao-Ying [1 ]
Zhang, Lin-Lin [1 ]
Yang, Feng-Mei [1 ]
Zhang, Jing-Ping [1 ]
机构
[1] NE Normal Univ, Natl & Local United Engn Lab Power Batteries, Fac Chem, Changchun 130024, Peoples R China
关键词
ANODE MATERIAL; CARBON; BATTERY; NANOPARTICLES; NANOFIBERS; COMPOSITE; ELECTRODE; GRAPHENE;
D O I
10.1021/jp511435w
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
Mesoporous SiO2 nanospheres (MSNs) and carbon nanocomposite with dual-porosity structure (DMSNs/C) were synthesized via a straightforward approach. Both MSNs and DMSNs/C showed uniform pore size distribution, high specific surface area, and large pore volume. When evaluated as an anode material for lithium ion batteries (LIBs), the DMSNs/C nanocomposite not only delivered an impressive reversible capacity of 635.7 mAh g(-1) (based on the weight of MSNs in the electrode material) over 200 cycles at 100 mA g(-1) with Coulombic efficiency (CE) above 99% but also exhibited excellent rate capability. The significant improvement of the electrochemical performance was attributed to synergetic effects of the dual-mesoporous structure and carbon coating layer: (i) the dual-porosity structure could increase the contact area and facilitate Li+ diffusion at the interface between the electrolyte and active materials, as well as buffer the volume change of MSNs, and (ii) the homogeneous carbon coating represented an excellent conductive layer, thus significantly speeding the lithiation process of the MSNs significantly, while further restraining the volume expansion. Considering the facile preparation and good lithium storage abilities, the DMSNs/C nanocomposite holds promise in applications in practical LIBs.
引用
收藏
页码:3495 / 3501
页数:7
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