PDF Publication Title:
Text from PDF Page: 028
Chem Soc Rev Review Article Fig. 16 (a) The crystal structure of Na2MP2O7. (Reproduced with permission from ref. 199, Copyright 2014 The Royal Society of Chemistry.) (b) Discharge capacity of Na2FeP2O7 as various current densities. (Reprinted from ref. 197, Copyright 2012, with permission from Elsevier.) (c) The crystal structure of b-Na2MnP2O7 polymorph consisting of MnO6 octahedra (pink), PO4 tetrahedra (light purple) and Na atoms (yellow) along [110] projection in which the possible sodium migration tunnels are highlighted by black dotted rectangles and (d) charge and discharge profiles of the b-Na2MnP2O7 cathode at a rate of C/20. (Reproduced with permission from ref. 202, Copyright 2013 The Royal Society of Chemistry.) (e) The crystal structure of Na2(VO)P2O7: corner- sharing between (VO)O4 and PO4 units (top) and the side and top view of the (VO)O4 square pyramid (bottom) and (f) the resulting charge and discharge curves of Na2(VO)P2O7 at a rate of C/20. (Reproduced from ref. 203 with permission, Copyright 2013 Wiley-VCH Verlag GmbH & Co. KGaA.) View Article Online provide better Na+ diffusion in comparison with a one-dimensional channel. Double chains are formed from simple parallel chains along the [010] direction. Kim et al. first utilized the mixed phosphate framework by introducing Fe2+ in the M sites to form Na4Fe3(PO4)2P2O7.205 Their first principles calculations demonstrated a low activation barrier for Na+ diffusion lower than 0.8 eV for all directions. This suggests that rapid Na+ diffusion is possible, because all Na sites are connected with reasonably low activation barriers. More specifically, the lowest activation barrier was found in the large tunnel along the b-axis. The material could deliver a capacity of 105 mA h g1 with an average operating voltage of 3.2 V (Fig. 17b). Nose et al. investi- gated Na4Co3(PO4)2P2O7 instead of the compound with Fe to improve the energy density.206 Knowledge obtained from experi- ments with LiCoPO4, which exhibits a high operating voltage from the Co2+/3+ redox reaction, was applied to Na4Co3(PO4)2P2O7.207 Thisjournalis©TheRoyalSocietyofChemistry2017 Chem.Soc.Rev.,2017,46,3529--3614 | 3555 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.PDF Image | Sodium-ion batteries present and future
PDF Search Title:
Sodium-ion batteries present and futureOriginal File Name Searched:
Sodium-ion batteries present and future.pdfDIY PDF Search: Google It | Yahoo | Bing
Salgenx Redox Flow Battery Technology: Salt water flow battery technology with low cost and great energy density that can be used for power storage and thermal storage. Let us de-risk your production using our license. Our aqueous flow battery is less cost than Tesla Megapack and available faster. Redox flow battery. No membrane needed like with Vanadium, or Bromine. Salgenx flow battery
CONTACT TEL: 608-238-6001 Email: greg@salgenx.com (Standard Web Page)