Nb-Doped TiO<sub>2</sub> Nanofibers for Lithium Ion Batteries

Fehse, Marcus; Cavaliere, Sara; Lippens, P.E.; Savych, Iuliia; Iadecola, Antonella; Monconduit, Laure; Jones, Deborah J.; Rozière, Jacqués; Fischer, Florent; Tessier, Cécile; Stievano, Lorenzo

doi:10.1021/jp402498p

Cited by 131 publications

(106 citation statements)

References 65 publications

(152 reference statements)

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“…The most promising include anatase TiO 2 nanotube arrays (TiO 2 -NTAs), [38,57] TiO 2 nanoleaves [58] and TiO 2 nanofibers. [59,60] The nanostructure and the surface area of these materials are crucial in order to perform well. TiO 2 electrodes possess various positive characteristics that have impact on ion transfer.…”

Section: Anatase Titanium Dioxide (Tio 2 )mentioning

confidence: 99%

Trends in Aluminium‐Based Intercalation Batteries

Ambrož

Macdonald

Nann

2017

Advanced Energy Materials

195

144

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energy, [4] large scale and portable energy storage becomes increasingly more important. Therefore, continued research into high-performing alternatives, which will meet the increased demand is imperative. A common way of evaluating potential alternatives for Li-based batteries involves calculating the theoretical specific capacity of potential candidates and comparing these results with other figures of merit. This reasoning leads to the conclusion that metals in the upper left corner of the periodic table are more interesting than the others. Table 1 shows these calculations together with some other parameters for common metal anodes.A second important parameter when searching for potential battery materials is the oxidation potential of the anode, where lower (less noble) is better. Comparing these parameters for the metals listed in Table 1 shows immediately that Li is one of the most promising candidates, but rare. The second most promising metal is aluminium (Al), which has a relatively high standard oxidation potential. Heavier metals and those in higher groups show much worse performance indicators. Nevertheless, this method of evaluation has to be considered with caution, because it is based on numerous assumptions. Such as, that the anode is oxidized during the charging/discharging process, which is not true for many practical systems.The literature on non-Li based intercalation batteries is clearly dominated by sodium (Na), [9,10] magnesium (Mg) [11,12] and Al [13] systems that are all more abundant natural elements than Li. There are few examples of potassium (K) [14] and (Ca), [15] which coincides clearly with the trend observed in Table 1 (as mentioned above, low performing "candidates" have been omitted in this table). Great efforts are aimed at these alternatives to improve capacity, power and cycles. Comparing Na-ion with Li-ion batteries, the common feature is a monovalent ion that can be inserted/extracted into/from the electrode material. Here, only one charge transfer takes place in contrast to Mg-ion, Ca-ion or Al-ion where two and three charges are involved in redox reactions respectively. As a result of multielectron reactions, higher specific capacity and energy density may be obtained. A key issue in order for multivalent ion insertion to be feasible is the electrode material that has to allow ion mobility.In this review, electrode materials for Al-ion batteries, namely different cathodes are discussed. Furthermore, their performance is compared highlighting drawbacks and advantages of every material.Over the last decade, optimizing energy storage has become significantly important in the field of energy conversion and sustainability. As a result of immense progress in the field, cost-effective and high performance batteries are imperative to meeting the future demand of sustainability. Currently, the best performing batteries are lithium-ion based, but limited lithium (Li) resources make research into alternatives essential. In recent years, the performance of aluminium-ion batteries ha...

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Section: Anatase Titanium Dioxide (Tio 2 )mentioning

confidence: 99%

Trends in Aluminium‐Based Intercalation Batteries

Ambrož

Macdonald

Nann

2017

Advanced Energy Materials

195

144

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“…Thus, much work aimed at developing nanostructured TiO 2 materials with high specific surface area and interconnected mesopores, readily accessible to electrolyte, which reduces the transport lengths of lithium ions and electrons and improves the performances of a Li-ion battery [12][13][14][15][16][17][18][19]. In addition, electronic conductivity can be improved by doping TiO 2 with aliovalent ions, such as vanadium, niobium, sulfur, or nitrogen [8,20,21], or by deposition of a conductive metal oxide phase at the surface of the nanoparticles [10].…”

Section: Introductionmentioning

confidence: 99%

Lithium insertion properties of mesoporous nanocrystalline TiO2 and TiO2–V2O5 microspheres prepared by non-hydrolytic sol–gel

Escamilla-Pérez

Louvain

Kaschowitz

et al. 2016

J Sol-Gel Sci Technol

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Mesoporous nanocrystalline TiO 2 and TiO 2 -V 2 O 5 microspheres were prepared by non-hydrolytic solgel from TiCl 4 , VOCl 3 , and i Pr 2 O at 110°C without any solvent or additives. The samples were characterized by elemental analysis, X-ray diffraction, Raman spectroscopy, scanning electron microscopy, nitrogen physisorption, and impedance measurements. At low vanadium loadings, only TiO 2 anatase was detected, and V 2 O 5 scherbinaite was also detected at high vanadium loadings. The texture of the samples depended on the V loading, but all the samples appeared built of primary nanoparticles (&10-20 nm in size) that aggregate to form mesoporous micron-sized spheres. The lithium insertion properties of these materials were evaluated by galvanostatic measurements taken using coin-type cells, in view of their application as electrode for rechargeable Li-ion batteries. The mesoporous TiO 2 microspheres showed good performances, with a specific reversible capacity of 145 and 128 mAh g -1 at C/2 and C, respectively (C = 335.6 mA g -1 ), good coulombic efficiency, and a moderate capacity fade (6 %) from the 2nd to the 20th cycle at C/20. Although the addition of V effectively increased the electronic conductivity of the powders, the specific reversible capacity and cycling performances of the TiO 2 -V 2 O 5 samples were only minimally improved for a 5 at% V loading and were lower at higher V loading. Graphical AbstractTiCl 4 + x VOCl 3+(4+3x)/2 i Pr 2 O 110 °C 4 d Drying Calcination

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“…The Li-ion diffusivity and charge-transfer ability were improved by substituting Ti 4þ with Nb 5þ . It's assumed that the Nb 4d orbital shifts the Fermi level to conduction band, which provides additional charge carriers, demonstrating metallic behavior [23,24,32]. Thus, the high conductivity of TiO 2 improves both cyclability and rate capability.…”

Section: Resultsmentioning

confidence: 99%

“…The benefits of Nb-substituted TiO 2 (NbeTiO 2 ) include elevation of the Fermi level and the addition of excess electrons into the unfilled band to increase electrical conductivity [22e24]. However, in recent studies, the electrochemical performance of NbeTiO 2 has not been substantially improved [23,25]. In order to enhance the rate capability of NbeTiO 2 , the concentration of Nb must be modified.…”

Section: Introductionmentioning

confidence: 99%