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Sodium-ion batteries present and future

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Sodium-ion batteries present and future ( sodium-ion-batteries-present-and-future )

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Chem Soc Rev Review Article Fig. 25 (a) Charge/discharge galvanostatic curves of amorphous 80 nm I.D. TiO2NT in Na half cell (red for discharge and black for charge). (Reproduced with permission from ref. 304, Copyright 2011 American Chemical Society.) (b) Galvanostatic investigation of the influence of the lower cut-off potential based on Coulombic efficiency (dis-)charge capacities. (Reprinted from ref. 307, Copyright 2014, with permission from Elsevier.) (c) Ex situ XRD patterns and (d) XANES K-edge spectra of 2.9 wt% carbon-coated anatase nanorod TiO2. (Reproduced with permission from ref. 309, Copyright 2014 American Chemical Society.) (e) In situ XRD analysis of the (de-)sodiation mechanism of anatase TiO2 nanoparticles, (f) scheme of the reaction mechanism. (Reproduced from ref. 310 with permission, Copyright 2015 Wiley-VCH Verlag GmbH & Co. KGaA.) View Article Online As a result, the Ti0.94Nb0.06O2 electrode exhibited excellent cycling performance with a reversible capacity of 160 mA h g􏰣1 at the 50th cycle. Later, Zhang et al. proposed rutile TiO2 micro- spheres anchored by nanoneedle clusters, which exhibited a capacity retention of 83.1% after 200 cycles at a current density of 0.1C-rate.327 Huang et al. found that one of the polymorphs, the low crystalline brookite-TiO2 was available for Na+ ion storage.329 Pioneer works of unusual TiO2 polymorphs, includ- ing the brookite-phase, the bronze-phase and their mixture phase, are recently investigated.330–333 However, sodium storage of TiO2 suffers from the sluggish sodium kinetics due to the larger ionic size of Na+ ions. To overcome this drawback, strategies such as the nano- architecture modified by metallic Ti and high conductivity carbon additives were introduced.309,311,328,331 Kim et al. fabricated pitch carbon-coated anatase TiO2 nanorods, which exhibited a high capacity of 193 mA h g􏰣1 and superior rate capability.309 Recently, Zhang et al. proposed graphene-rich wrapped petal-like rutile TiO2 tuned by carbon dots, which exhibited the outstanding sodium-storage performances.328 Thisjournalis©TheRoyalSocietyofChemistry2017 Chem.Soc.Rev.,2017,46,3529--3614 | 3567 Open Access Article. Published on 28 March 2017. Downloaded on 7/1/2019 3:41:21 AM. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.

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