Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Natalia N. Bramnik"'
Autor:
Alexander A. Tsirlin, Natalia N. Bramnik, Daria Mikhailova, Anatoliy Senyshyn, Jürgen Eckert, Helmut Ehrenberg, Wolfgang Gruner, Steffen Oswald, A. Thomas, Dmytro M. Trots
Publikováno v:
Journal of The Electrochemical Society. 160:A3082-A3089
Publikováno v:
Journal of Power Sources. 217:464-469
Samples with nominal composition LiM0.5Mn1.5O4 (M = Fe, Co) were synthesized via a sol–gel process with a post thermal treatment at 1000 °C. In contrast to the Ni-analogue Co- and Fe-doped samples show a fast degradation at 55 °C with an average
Autor:
Helmut Ehrenberg, Steffen Oswald, Natalia N. Bramnik, Ljubomira Ana Schmitt, D. Mikhailova, Angelina Sarapulova
Publikováno v:
Journal of Sol-Gel Science and Technology. 62:98-110
LiCoPO4-coated disordered carbon nanofibers (CNFs/LiCoPO4) were obtained by a sol–gel method, using triethyl phosphite or triethyl phosphate as the phosphorous source. The crystal structure of the products was analyzed by X-ray powder diffraction,
Autor:
Jörg J. Schneider, Ljubomira Ana Schmitt, Hermann Tempel, Lucangelo Dimesso, Alexander Popp, Angelina Sarapulova, Wolfram Jaegermann, Christoph Förster, Helmut Ehrenberg, Daria Mikhailova, Jörg Engstler, Natalia N. Bramnik, Jayaprakash Khanderi
Publikováno v:
European Journal of Inorganic Chemistry. 2011:4349-4359
Hybrid materials composed of LiMPO4 (M = Fe or Co) with multiwalled carbon nanotubes (MCNTs) were synthesized by tethering lithium phosphoolevins on isolated stochastically disordered MWCNTs as well as on ordered 3D MWCNT arrays via solution based im
Autor:
Daria Mikhailova, D. Trots, Natalia N. Bramnik, S. Oswald, Helmut Ehrenberg, Kirill G. Bramnik, Anatoliy Senyshyn, P. Reichel
Publikováno v:
Chemistry of Materials. 23:3429-3441
Different modifications of LixMoO2 (1) without metallic Mo–Mo bonds (R-3m, a = 2.858(2) A, c = 15.701(13) A), (2) with endless Mo chains with metallic bonds (C2/m, a = 10.614(3) A, b = 2.878(1) A, c = 4.955(2) A, β = 99.37(3)°), and (3) with Mo4O
Autor:
Angelina Sarapulova, D. Mikhailova, A. Voss, Helmut Ehrenberg, D. Trots, Natalia N. Bramnik, W. Gruner, A. Thomas, S. Oswald
Publikováno v:
Chemistry of Materials. 22:3165-3173
Besides topotactical Li insertion, Li deinsertion also is possible for the new potential electrode material Li3V(MoO4)3, in contrast to isostructural Li3Fe(MoO4)3. This new phase crystallizes in an orthorhombic NASICON-type structure with large chann
Autor:
Hartmut Fuess, Brahim El Bali, Ingrid Svoboda, Natalia N. Bramnik, Helmut Ehrenberg, Rachid Essehli
Publikováno v:
Materials Research Bulletin. 44:817-821
The new titanium oxyphosphate Co 0.5 TiPO 5 has been prepared by solid state reaction. Its structure has been determined by single crystal X-ray diffraction and was further investigated by FT-IR spectroscopy and magnetic measurements. The compound cr
Publikováno v:
Solid State Sciences. 11:18-23
Precise structural data have been determined from a combined Rietveld refinement, based on neutron and X-ray powder diffraction data simultaneously, for the three phases LiCoPO4, LizCoPO4 with a specific intermediate Li-content z = 0.60(10) and CoPO4
Autor:
Natalia N. Bramnik, Helmut Ehrenberg
Publikováno v:
Journal of Alloys and Compounds. 464:259-264
Olivine-like LiMnPO4 was prepared from the NH4MnPO4·H2O precursor precipitated from the aqueous solution. Different morphologies of the LiMnPO4 were obtained by the solid-state reaction of the precursor with LiOH (granular, 100–300 nm) and by ion-
Publikováno v:
Journal of Power Sources. 180:553-560
Carbon Nano Fibers (CNFs) coated with LiFePO 4 particles have been prepared by a non-aqueous sol–gel technique. The functionalization of the CNFs by HNO 3 acid treatment has been confirmed by Raman and XPS analyses. The samples pure LiFePO 4 and Li