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题名: Energy storage mechanism in aqueous fiber-shaped Li-ion capacitors based on aligned hydrogenated-Li4Ti5O12 nanowires
作者: Hao Zhao1; Xiangwen Ma1; Jinglong Bai1; Zhenyu Yang1; Gengzhi Sun2; Zhenxing Zhang1; Xiaojun Pan1; Wei Lan1; Zhou JY(周金元)1; Erqing Xie1
收录类别: SCIE
出版日期: 2017-05
刊名: Nanoscale
卷号: 9, 期号:24, 页码:8192-8199
出版者: RSC
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 doublehelical structure. The obtained single LTO wire electrode exhibits a high specific capacitance in volume (34.1 F cm−3) and superior cycling stabilities (∼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 μW 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: School of Physical Science and Technology, Lanzhou University, Lanzhou, Gansu, 730000, People’s Republic of China
通讯作者: Jin Yuan Zhou
语种: 英语
DOI: 10.1039/c7nr02164j
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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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作者单位: 1.School of Physical Science and Technology, Lanzhou University, Lanzhou, Gansu,
2.Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM),

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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