Lithium-ion capacitors with 2D Nb2CTx (MXene) - carbon nanotube electrodes

By A. Byeon, A. Glushenkov, B. Anasori, Patrick Urbankowski, Jingwen Li, Bryan W. Byles, B. Blake, K. L. Aken, S. Kota, Ekaterina Pomerantseva and 3 more. 2016

196 citations recorded by the source corpus.

Abstract There is a growing interest to hybrid energy storage devices, such as lithium-ion capacitors, in which battery-type electrodes are combined with capacitor-type ones. It is anticipated that the energy density (either gravimetric or volumetric) of lithium-ion capacitors is improved if pseudocapacitive or fast insertion materials are used instead of conventional activated carbon (AC) in the capacitor-type electrode. MXenes, a new family of two-dimensional transition metal carbides, demonstrate metallic conductivity and fast charge-discharge behavior that make them suitable for this application. In this study, we move beyond single electrodes, half-cell studies and demonstrate three types of hybrid cells using Nb 2 CT x –carbon nanotube (CNT) films. It is shown that lithiated graphite/Nb 2 CT x -CNT, Nb 2 CT x -CNT/LiFePO 4 and lithiated Nb 2 CT x -CNT/Nb 2 CT x -CNT cells are all able to operate within 3 V voltage windows and deliver capacities of 43, 24 and 36 mAh/g (per total weight of two electrodes), respectively. Moreover, the polarity of the electrodes can be reversed in the symmetric Nb 2 CT x -CNT cells from providing a positive potential between 0 and 3 V to a negative one from −3 to 0 V. It is shown that the volumetric energy density (50–70 Wh/L) of our first-generation devices with MXene electrodes exceeds that of a lithium titanate/AC capacitor.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/c0b4561b714d91000d94443cd894814c184186d5

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In Electrical and Electronic Engineering

1. C. Liao
2. Hongli Zhu
3. Songping Wu
4. A. Hafez
5. Shu-Chao Sun

In Electronic, Optical and Magnetic Materials

1. C. Liao
2. Hongli Zhu
3. Songping Wu
4. A. Hafez
5. Shu-Chao Sun

In Materials Chemistry

1. C. Liao
2. Hongli Zhu
3. Songping Wu
4. A. Hafez
5. Shu-Chao Sun

Citations in the corpus

• Two-dimensional MXenes for energy storage (2018, methodology): “In another reference, the volumetric energy densities of 50–70Wh L for Nb2CTx-CNT/LiFePO4 and lithiated Nb2CTx-CNT/Nb2CTx-CNT cells have been reported to exceed the energy density of a conventional lithium titanium oxide/activated carbon capacitors [107], suggesting a great potential of MXenes in Li”