Journal ArticleDOI
A new concept hybrid electrochemical surpercapacitor: Carbon/LiMn2O4 aqueous system
Yonggang Wang,Yongyao Xia +1 more
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TLDR
In this paper, a hybrid electrochemical surpercapacitor was proposed in which activated carbon was used as a negative electrode and a lithium-ion intercalated compound LiMn2O4 as a positive electrode in a mild Li2SO4 aqueous electrolyte.About:
This article is published in Electrochemistry Communications.The article was published on 2005-11-01. It has received 289 citations till now. The article focuses on the topics: Supercapacitor & Electrode.read more
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Electrochemical capacitors: mechanism, materials, systems, characterization and applications
TL;DR: The latest progress in supercapacitors in charge storage mechanisms, electrode materials, electrolyte materials, systems, characterization methods, and applications are reviewed and the newly developed charge storage mechanism for intercalative pseudocapacitive behaviour is clarified for comparison.
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Asymmetric Supercapacitors Based on Graphene/MnO2 and Activated Carbon Nanofiber Electrodes with High Power and Energy Density
TL;DR: An asymmetric supercapacitor with high energy density has been developed successfully using graphene/MnO2 composite as positive electrode and activated carbon nanofibers (ACN) as negative electrode in a neutral aqueous Na2SO4 electrolyte as mentioned in this paper.
Journal ArticleDOI
Recent Advances in Design and Fabrication of Electrochemical Supercapacitors with High Energy Densities
TL;DR: In this paper, the authors reviewed several key issues for improving the energy densities of supercapacitors and some mutual relationships among various effecting parameters, and challenges and perspectives in this exciting field are discussed.
Journal ArticleDOI
Carbon materials for electrochemical capacitors
TL;DR: In this paper, the carbon materials used for electrochemical capacitors were reviewed and discussed the contribution of the surfaces owing to micropores and other larger pores to the capacitance and rate performance of the electric double-layer capacitors.
Journal ArticleDOI
TiO2 nanotubes: Self-organized electrochemical formation, properties and applications
Jan M. Macak,Hiroaki Tsuchiya,Andrei Ghicov,Kouji Yasuda,Robert Hahn,Sebastian Bauer,Patrik Schmuki +6 more
TL;DR: In this article, an overview and review on self-organized TiO2 nanotube layers and other transition metal oxide tubular structures grown by controlled anodic oxidation of a metal substrate is given.
References
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Journal ArticleDOI
Improved capacity retention in rechargeable 4 V lithium/lithium- manganese oxide (spinel) cells
TL;DR: In this article, the authors improved the rechargeable capacity of 4 V LixMn2O4 spinel cathodes by modifying the composition of the spinel electrode, achieving a capacity in excess of 100 mAh/g in flooded-electrolyte lithium cells.
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Rechargeable Lithium Batteries with Aqueous Electrolytes
TL;DR: Rechargeable lithium-ion batteries that use an aqueous electrolyte have been developed and provide a fundamentally safe and cost-effective technology that can compete with nickelcadmium and lead-acid batteries on the basis of stored energy per unit of weight.
Journal ArticleDOI
Capacity Fading on Cycling of 4 V Li / LiMn2 O 4 Cells
Abstract: The cycle-life behavior of a Li/1 M-LiPF 6 + EC/DMC(1:2 by volume)/LiMn 2 O 4 cell was investigated at various temperatures (0, 25, and 50°C). The capacity fades faster on cycling at high rather than low temperatures. The mechanisms responsible for the capacity fading of the spinel LiMn 2 O 4 during cycling were extensively investigated by chemical analysis of the dissolved Mn in combination with in situ x-ray diffraction, Rietveld analysis, and ac impedance techniques. Chemical analytical results indicated that the capacity loss caused by the simple dissolution of Mn 3+ accounted for only 23 and 34% of the overall capacity losses cycling at room temperature and 50°C, respectively. In situ x-ray diffraction results showed that the two-phase structure coexisting in the high-voltage region persists during lithium-ion insertion/extraction at low temperatures during cycling. By contrast, this two-phase structure was effectively transformed to a more stable, one-phase structure, accompanied by the dissolution of Mn and the loss of oxygen (e.g., Mn 2 O 3 .MnO) at the high temperature; this dominated the overall capacity-loss process. AC impedance spectra revealed that the capacity loss at the high temperature was also due in part to the decomposition of electrolyte solution at the electrode.
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Synthesis Conditions and Oxygen Stoichiometry Effects on Li Insertion into the Spinel LiMn2O4
Jean-Marie Tarascon,Jean-Marie Tarascon,Jean-Marie Tarascon,W. R. Mckinnon,F. Coowar,T. Bowmer,Glenn G. Amatucci,Dominique Guyomard +7 more
TL;DR: In this article, the deintercalation of lithium from the spinel LiMn[sub 2]O[sub 4] was studied and the origin of two new reversible oxidation-reduction peaks near 4.5 and 4.9 V were examined.
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An Investigation of Lithium Ion Insertion into Spinel Structure Li‐Mn‐O Compounds
Yongyao Xia,Masaki Yoshio +1 more
TL;DR: In this paper, two kinds of spinel structure lithium manganese oxides obtained by a melt-impregnation method were examined in a lithium nonaqueous cell and the mechanism of the lithium ion insertion into the spinel compound was studied by several physical and chemical methods (differential chronopotentiometric curves, cyclic voltammetry, and opencircuit voltage measurement) X-ray diffraction was also used to investigate the structural changes for both types of compounds at different oxidation depths at first charge.