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兰州大学机构库  > 物理科学与技术学院  > 期刊论文
题名: Energy storage mechanism in aqueous fiber-shaped Li-ion capacitors based on aligned hydrogenated-Li4Ti5O12 nanowires
作者: Zhao, H; Ma, XW; Bai, JL; Yang, ZY; Sun, GZ; Zhang, ZX(张振兴); Pan, XJ(潘孝军); Lan, W; Zhou, JY(周金元); Xie, EQ(谢二庆)
收录类别: SCIE ; PUBMED
出版日期: 2017-06-28
刊名: NANOSCALE
卷号: 9, 期号:24, 页码:8192-8199
出版者: ROYAL SOC CHEMISTRY
出版地: CAMBRIDGE
英文摘要: It is reported that Li ions can contribute a lot to the capacitance of aqueous Li-ion capacitors (LICs), which might be due to the intercalation/de-intercalation processes of Li+ ions that also occur at the anodes. However the energy storage mechanism in the aqueous LIC system still requires further proof. In this work, a type of aqueous fiber-shaped LIC has been designed and developed using hydrogenated Li4Ti5O12 (H-LTO) anodes, active carbon (AC) cathodes, and LiCl/PVA gel electrolytes with a double-helical structure. The obtained single LTO wire electrode exhibits a high specific capacitance in volume (34.1 F cm(-3)) and superior cycling stabilities (similar to 100% over 100 000 cycles), both of which are due to the formed amorphous layers at the surface of the electrodes. Moreover, it is found via sweep voltammetry analysis that most of the energy stored in an aqueous fiber-shaped capacitor electrode is attributed to the Li ions' intercalation, whose content exceeds 85% at a low scan rate and gradually decreases with increasing scan rate; while the energy stored by the double electric layers remains almost unchanged with different scan rates. Furthermore, the well-matched wearable fiber-shaped LICs show high capacitive behaviors (18.44 mu W h cm(-2)) and superior static/dynamic cycling stabilities. This research would provide some insight into the charge storage mechanism in electrodes in the aqueous system, and give more suggestions to develop high-energy-density fiber-shaped energy storage devices.
作者部门: [Zhao, Hao ; Ma, Xiangwen ; Bai, Jinglong ; Yang, Zhenyu ; Sun, Gengzhi ; Zhang, Zhenxing ; Pan, Xiaojun ; Lan, Wei ; Zhou, Jin Yuan ; Xie, Erqing] Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Gansu, Peoples R China
通讯作者: Zhou, JY ; Xie, EQ (reprint author), Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Gansu, Peoples R China.
学科分类: Chemistry; Science & Technology - Other Topics; Materials Science; Physics
文章类型: Article
所属项目编号: National Natural Science Foundation of China [11474135, 51572118, 11674140] ; Fundamental Research Funds for the Central Universities [lzujbky-2015-110]
所属项目名称: 国家自然科学基金项目 ; 中央高校基本科研业务费专项资金
项目资助者: NSFC ; LZU
语种: 英语
DOI: 10.1039/c7nr02164j
ISSN号: 2040-3364
WOS记录号: WOS:000403943600017
PM记录号: 28580993
IR记录号: WOS:000403943600017
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/189737
Appears in Collections:物理科学与技术学院_期刊论文

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Recommended Citation:
Hao Zhao,Xiangwen Ma,Jinglong Bai,et al. Energy storage mechanism in aqueous fiber-shaped Li-ion capacitors based on aligned hydrogenated-Li4Ti5O12 nanowires[J]. Nanoscale,2017,9(24):8192-8199.
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