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Journal article
MXene-manganese oxides aqueous asymmetric supercapacitors with high mass loadings, high cell voltages and slow self-discharge
ENERGY STORAGE MATERIALS, v 38, pp 438-446
01 Jun 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
How to achieve high mass loadings while maintaining high energy and power densities together with slow self-discharge rates for aqueous asymmetric supercapacitors (AASCs) remains a great challenge. Herein, we tested an AASC using Ti3C2Tz MXene as the negative electrode, a mixture of manganese oxides, Mn3O4 and MnOOH, as the positive electrode with a saturated lithium chloride (14 M LiCl) electrolyte. This device, with electrode thicknesses of > 100 mu m, and a mass loading of similar to 10 mg cm(-2), resulted in an energy density of approximate to 30 Wh kg(-1) at 0.5 A g(-1), a power density of approximate to 23 kW kg(-1) at 20 A g(-1), an open cell voltage of 2.3 V, excellent rate capability and cycling stability. When allowed to self-discharge for 54 h at room temperature, similar to 66% of the voltage was retained. Crucially, after that time the cell voltage was > 1.5 V. This work opens a new opportunity for high performance, environmentally friendly AASCs, where high energy and power densities are combined with slow self-discharge rates at commercial mass loadings.
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Details
- Title
- MXene-manganese oxides aqueous asymmetric supercapacitors with high mass loadings, high cell voltages and slow self-discharge
- Creators
- Wei Zheng - Linköping UniversityJoseph Halim - Linköping UniversityZhengMing Sun - Southeast UniversityJohanna Rosen - Linköping UniversityMichel W. Barsoum - Drexel University
- Publication Details
- ENERGY STORAGE MATERIALS, v 38, pp 438-446
- Publisher
- Elsevier
- Number of pages
- 9
- Grant note
- Knut and Alice Wallenberg (KAW) foundation for a Fellowship/Scholar grant EM16-0004 / Swedish Foundation for Strategic Research (SSF); Swedish Foundation for Strategic Research
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000645680900002
- Scopus ID
- 2-s2.0-85103691743
- Other Identifier
- 991019169637804721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology