Nanotechnology of Positive Electrodes for Li-Ion Batteries

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Nanotechnology of Positive Electrodes for Li-Ion Batteries ( nanotechnology-positive-electrodes-li-ion-batteries )

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Inorganics 2017, 5, 25 Inorganics 2017, 5, 25 Inorganics 2017, 5, 25 4 of 17 4 of 17 4 of 17 Figure 3. Molecular scheme of mixed chelators with different architectures, which belong to the class Figure 3. Molecular scheme of mixed chelators with different architectures, which belong to the class of of bio-reagents. (a) chelators formed by a single or dual reagents, i.e. carboxylic acids; (b) mixed Figure 3. Molecular scheme of mixed chelators with different architectures, which belong to the class bio-reagents. (a) chelators formed by a single or dual reagents, i.e. carboxylic acids; (b) mixed chelators chelators including several bio-reagents with complex structure. of bio-reagents. (a) chelators formed by a single or dual reagents, i.e. carboxylic acids; (b) mixed including several bio-reagents with complex structure. chelators including several bio-reagents with complex structure. Figure 4 shows the X-ray diffraction (XRD) patterns for the MnO2 nanowires prepared by the reduction of KMnO4 by a carboxylic acid at 350 °C. Using ascorbic acid (vitamin C) as a single chelator, Figure 4 shows the X-ray diffraction (XRD) patterns for the MnO2 nanowires prepared by the Figure 4 shows the X-ray diffraction (XRD) patterns for the MnO2 nanowires prepared by the the product crystallizes in the tetragonal struc◦ture of the α-MnO2 cryptomelane (space group I4/m) reduction of KMnO by a carboxylic acid at 350 C. Using ascorbic acid (vitamin C) as a single chelator, reduction of KMn4O4 by a carboxylic acid at 350 °C. Using ascorbic acid (vitamin C) as a single chelator, with a 2 × 2 tunnels. The mean crystallite size of the α-MnO2 nanoneedles is Lc = 14 nm [13]. The same theproductcrystallizesinthetetragonalstructureoftheα-MnO cryptomelane(spacegroupI4/m) the product crystallizes in the tetragonal structure of the α-MnO22cryptomelane (space group I4/m) material prepared by a green technique using a mixed chelator composed by bio-reagents such as withwait2h×a22×tu2ntunnenlse.lsT.hTehmemeaenancrcyrystsatallliltietessizizeeoffttheα-MnO2 naannoonneeeddlelsesisisLcL=1=41n4mnm[13[]1.3T]h.eTshaemseame 2c those that exhibit a smaller crystallite size of 6.4 nm, which results in primary nanorods of ~17 nm in matmeraiatelrpiarelparerepdarbeydabygraeegnretenchtneciqhuneiquseinugsiangmaixmedixcehdeclahteolratcoormcopmospeodsebdybyiob-rieoa-rgeeangtesnstuscshucahsathsose diameter and 84 nm in length. Slight modifications of the synthesis recipe induce different those that exhibit a smaller crystallite size of 6.4 nm, which results in primary nanorods of ~17 nm in that exhibit a smaller crystallite size of 6.4 nm, which results in primary nanorods of ~17 nm in diameter morphologies of nanostructured α-MnO2; for instance, sea-urchin-like shape, with a diameter of ~3 μm, diameter and 84 nm in length. Slight modifications of the synthesis recipe induce different and 84 nm in length. Slight modifications of the synthesis recipe induce different morphologies of were prepared in acidic conditions [13], while a neutral medium provided a caddice-clew-like MnO2 morphologies of nanostructured α-MnO2; for instance, sea-urchin-like shape, with a diameter of ~3 μm, nanostructured α-MnO ; for instance, sea-urchin-like shape, with a diameter of ~3 μm, were prepared showing lower electr2ochemical performance [14]. The use of mixed chelator has been successful for were prepared in acidic conditions [13], while a neutral medium provided a caddice-clew-like MnO2 inactihdeicgcronwdthitiofnsL[i1-r3i]c,hwehlailyeearendeucotrmalpmouendisu.mThperoLvii[dLei0d.2Nai0c.2aMddn0i.c6]eO-c2leowxi-dliekewMasnOprepsharoewdinbgylaower 2 showing lower electrochemical performance [14]. The use of mixed chelator has been successful for electcromchbienmediccailtrpicerafcoidrm(CaAn)cean[d14a]n. Tetheyluesnedoifamiinxedtetcrhaaeclaetiocrahciads(bEeDeTnAs)urcocuetses.fTuylpfiocraltlyh,eCgAroawndth of the growth of Li-riche layered compounds. The Li[Li0.2Ni0.2Mn0.6]O2 oxide was prepared by a EDTA dissolved in NH4OH was added to a solution containing requested stoichiometry of metal Li-riche layered compounds. The Li[Li0.2Ni0.2Mn0.6]O2 oxide was prepared by a combined citric acid combined citric acid (CA) and an ethylenediamine tetraacetic acid (EDTA) route. Typically, CA and acetate. The viscous gel was formed at ~120 °C and the final product heated at 850 °C for few hours. (CA) and an ethylenediamine tetraacetic acid (EDTA) route. Typically, CA and EDTA dissolved in EDTA dissolved in NH4OH was added to a solution containing requested stoichiometry of metal Note the crucial importance of the acid/metal ratio, which in the present case is 1.5:1:1 to keep the NH4OH was added to a solution containing requested stoichiometry of metal acetate. The viscous acetate. The viscous gel was formed at ~120 °C and the final product heated at 850 °C for few hours. nanostructure [15]. ◦ gel was formed at ~120 C and the final product heated at 850 ◦ C for few hours. Note the crucial Note the crucial importance of the acid/metal ratio, which in the present case is 1.5:1:1 to keep the importance of the acid/metal ratio, which in the present case is 1.5:1:1 to keep the nanostructure [15]. nanostructure [15]. Figure 4. XRD patterns for (a) α-MnO2 nanoneedles prepared by the reduction of KMnO4 using the single ascorbic-acid route and (b) α-MnO2 nanowires prepared using the mixed chelator shown in Figure 34b. .XCRoDpypraitgthertnpserfomris(asi)oαn-fMronmO2Spnrainogneer.edles prepared by the reduction of KMnO4 using the Figure 4. XRD patterns for (a) α-MnO2 nanoneedles prepared by the reduction of KMnO4 using the single ascorbic-acid route and (b) α-MnO2 nanowires prepared using the mixed chelator shown in single ascorbic-acid route and (b) α-MnO2 nanowires prepared using the mixed chelator shown in Figure 3b. Copyright permission from Springer. Figure 3b. Copyright permission from Springer.

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