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题名: A modified hierarchical porous carbon for lithium/sulfur batteries with improved capacity and cycling stability
作者: Wang, Meiri1;  Zhang, Huamin1;  Zhang, Yining1;  Li, Jing1, 2;  Zhang, Fengxiang1;  Hu, Wen1
关键词: Lithium/sulfur battery ;  Cycle ability ;  Hierarchically porous carbon ;  Sulfur utilization ;  Metal salt
刊名: JOURNAL OF SOLID STATE ELECTROCHEMISTRY
发表日期: 2013-08-01
DOI: 10.1007/s10008-013-2096-1
卷: 17, 期:8, 页:2243-2250
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: A hierarchical porous carbon material as the conductive matrix in the sulfur cathode for rechargeable lithium batteries is prepared by an in situ two-step activation method using sucrose as the carbon source, CaCO3 as the template, and (CH3COO)(2)Cu center dot H2O (Cu(Ac)(2)) as the additive. The microstructure and morphology of the activated porous sulfur-carbon composite is characterized by means of X-ray diffraction, N-2 adsorption-desorption, and scanning electron microscopy. The functioning mechanism of the additive on the pore formation is investigated using thermogravimetric analysis. Our results establish that thermal decomposition of the nano-CaCO3 template results in the formation of the hierarchical porous carbon structure, and addition of Cu(Ac)(2) influences the carbonization process in an un-homogeneous way through the copper ion-sucrose reaction, resulting in the volume increment of small mesopores. The sample obtained shows better sulfur dispersion in the active porous carbon than that synthesized without Cu(Ac)(2) involvement, which is attributable to the modified pore structure and enlarged pore volume. Thus, a better utilization of sulfur is achieved and the initial discharge capacity increases from 1,287 to 1,397 mAh g(-1). Furthermore, the Li-S battery shows improved cycle stability because of enhanced interaction between the sulfur and the small mesopore.
关键词[WOS]: SULFUR BATTERIES ;  ELECTROCHEMICAL PERFORMANCE ;  ACTIVATED CARBON ;  CATHODE ;  CELLS ;  COMPOSITES ;  ELECTRODE
语种: 英语
WOS记录号: WOS:000322392600017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137507
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Energy Storage Div, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Wang, Meiri,Zhang, Huamin,Zhang, Yining,et al. A modified hierarchical porous carbon for lithium/sulfur batteries with improved capacity and cycling stability[J]. JOURNAL OF SOLID STATE ELECTROCHEMISTRY,2013,17(8):2243-2250.
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