Journal ArticleDOI
Vanadium Oxide Nanowire–Carbon Nanotube Binder‐Free Flexible Electrodes for Supercapacitors
Sanjaya D. Perera,Bijal B. Patel,Nour Nijem,Katy Roodenko,Oliver Seitz,John P. Ferraris,Yves J. Chabal,Kenneth J. Balkus +7 more
TLDR
In this paper, the authors developed a simple method for preparing freestanding carbon nanotube (CNT)-V2O5 nanowire (VNW) composite paper electrodes without using binders.Abstract:
Vanadium pentoxide (V2O5) layered nanostructures are known to have very stable crystal structures and high faradaic activity. The low electronic conductivity of V2O5 greatly limits the application of vanadium oxide as electrode materials and requires combining with conducting materials using binders. It is well known that the organic binders can degrade the overall performance of electrode materials and need carefully controlled compositions. In this study, we develop a simple method for preparing freestanding carbon nanotube (CNT)-V2O5 nanowire (VNW) composite paper electrodes without using binders. Coin cell type (CR2032) supercapacitors are assembled using the nanocomposite paper electrode as the anode and high surface area carbon fiber electrode (Spectracarb 2225) as the cathode. The supercapacitor with CNT-VNW composite paper electrode exhibits a power density of 5.26 kW Kg−1 and an energy density of 46.3 Wh Kg−1. (Li)VNWs and CNT composite paper electrodes can be fabricated in similar manner and show improved overall performance with a power density of 8.32 kW Kg−1 and an energy density of 65.9 Wh Kg−1. The power and energy density values suggest that such flexible hybrid nanocomposite paper electrodes may be useful for high performance electrochemical supercapacitors.read more
Citations
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Journal ArticleDOI
Interfacial Constructing Flexible V2O5@Polypyrrole Core–Shell Nanowire Membrane with Superior Supercapacitive Performance
TL;DR: The V2O5 is for the first time demonstrated to show versatile function of reactive template to initiate the uniform and conformal polymerization of PPy nanocoating without the need for extra oxidants.
Journal ArticleDOI
Depolarized and fully active cathode based on Li(Ni0.5Co0.2Mn0.3)O2 embedded in carbon nanotube network for advanced batteries.
Zhongzhen Wu,Xiaogang Han,Jiaxin Zheng,Yi Wei,Ruimin Qiao,Fei Shen,Jiaqi Dai,Liangbing Hu,Kang Xu,Yuan Lin,Wanli Yang,Feng Pan +11 more
TL;DR: A significant enhancement of cathode capacity utilization through a novel concept of material design embedding Li(Ni0.5Co0.2Mn0.3)O2 in the single wall carbon nanotube (CNT) network, which delivers new insights on both practical designs and fundamental understandings of battery cathodes.
Journal ArticleDOI
Fast Supercapacitors Based on Graphene-Bridged V2O3/VOx Core–Shell Nanostructure Electrodes with a Power Density of 1 MW kg−1
TL;DR: In this paper, a vanadium oxides core/shell nanostructure-based electrode to overcome the resistivity challenge of transition metal oxides (TMOs) for rapid pseudocapacitive EC design is reported.
Journal ArticleDOI
Extraordinary pseudocapacitive energy storage triggered by phase transformation in hierarchical vanadium oxides.
TL;DR: It is shown that in situ corundum-to-rutile phase transformation in electron-correlated vanadium sesquioxide can yield nonstoichiometric rutile vanadium dioxide layers that are composed of highly sodium ion accessible oxygen-deficiency quasi-hexagonal tunnels sandwiched between conductive rUTile slabs.
Journal ArticleDOI
Fabrication and functionalization of carbon nanotube films for high-performance flexible supercapacitors
TL;DR: In this article, the recent progress in the design, preparation and functionalization of carbon nanotube (CNT) based electrodes for the fabrication of high-performance flexible supercapacitors are introduced in details, including the synthesis of conductive CNT films for the electrodes of supercapACitors, and the functionalizations of CNT film with other high-capacitance materials by both mixing and in situ growth strategies for highperformance composite electrodes.
References
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Journal ArticleDOI
Materials for electrochemical capacitors
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Conducting-polymer-based supercapacitor devices and electrodes
TL;DR: In-situ high-resolution transmission electron microscopy (HRTEM) studies of the structural transformations that occur during the synthesis of carbon-coated LiFePO4 and heat treatment to elevated temperatures were conducted in two different electron microscopes as discussed by the authors.
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Anchoring Hydrous RuO2 on Graphene Sheets for High-Performance Electrochemical Capacitors
TL;DR: In this paper, the authors demonstrate the importance and great potential of graphene-based composites in the development of high-performance energy-storage systems and demonstrate that the combined advantages of GSs and RuO 2 in such a unique structure are that the ROGSC-based supercapacitors exhibit high specifi c capacitance ( ∼ 570 F g − 1 for 38.3 wt% Ru loading), enhanced rate capability, excellent electrochemical stability ( ∼ 97.9% retention after 1000 cycles), and high energy density (20.1 Wh kg − 1 )
Journal ArticleDOI
R&D considerations for the performance and application of electrochemical capacitors
TL;DR: In this article, the development of lower cost carbons appropriate for use in electrochemical capacitors is underway by several speciality carbon suppliers. The goal is to reduce the cost of the carbon to $10-15/kg.