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Yekaterinburg, Russia

An anode material is based on lithium-titanium spinel that contains doping components, chromium and vanadium, in equivalent quantities, of the chemical formula Li


Field of use: the electrotechnical industry, in particular, anode materials for lithium-ion ECCs. Essence of the invention: Anode material based on lithium-titanium spinel that contains doping components, chromium and vanadium, in equivalent quantities, of the chemical formula Li


Kellerman D.G.,Ural Federal University | Chukalkin Y.G.,RAS Institute of Metal Physics | Mukhina N.A.,Eliont LLC | Gorshkov V.S.,Eliont LLC | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2012

V-substituted LiMnPO 4 has been synthesized by the solid state reaction route. Combined Rietveld refinement of neutron and X-ray data revealed that all vanadium ions are located in the same positions as the phosphorus ions. The magnetic structure of LiMnP 0.85V 0.15O 4 was found to be the same as that described for undoped antiferromagnetic LiMnPO 4 (T N=34.5 K). DC-magnetization measurements were carried out to study the peculiarities of magnetic ordering in LiMnP 0.85V 0.15O 4. An irreversible behavior of DC magnetization was found at magnetic fields less than ∼2 kOe. It was demonstrated that an increase in the magnitude of the applied field leads to a reduction of the discrepancy between zero-field-cooled and field-cooled processes. These effects were explained by the movement of domain walls and by transition of the system to a monodomain state. The anomaly in the magnetization vs field dependence attributed presumably to the spin-flop transition was observed at ∼40 kOe. The existence of magnetic inhomogeneity in the paramagnetic phase of LiMnP 0.85V 0.15O 4 was proved by the analysis of the χT product. It was concluded that the observed changes in χT are indicative of a competition between ferromagnetic and antiferromagnetic correlations at temperatures slightly exceeding T N. © 2012 Elsevier B.V. All rights reserved. Source


Kellerman D.G.,Ural Federal University | Chukalkin Y.G.,RAS Institute of Metal Physics | Medvedeva N.I.,RAS Institute of Solid State Chemistry | Kuznetsov M.V.,RAS Institute of Solid State Chemistry | And 3 more authors.
Materials Chemistry and Physics | Year: 2015

The samples of vanadium-doped LiMnPO4 have been sthesized by the solid-state reaction technique. To reduce the oxidation state of vanadium from V5+ to V4+, the samples have been additionally annealed under hydrogen atmosphere. The tetravalent state of vanadium was proved by analysis of V 2p X-ray photoelectron spectra. Raman spectroscopy, first-principle studies and magnetic measurements were used to determine the effect of V4+ on the Li-Mn phosphate properties. © 2014 Elsevier B.V. All rights reserved. Source


Kellerman D.G.,RAS Institute of Solid State Chemistry | Mukhina N.A.,Eliont LLC | Zhuravlev N.A.,RAS Institute of Solid State Chemistry | Valova M.S.,Russian Academy of Sciences | Gorshkov V.S.,Eliont LLC
Physics of the Solid State | Year: 2010

The optical absorption and nuclear magnetic resonance spectra of Li4 - xCr3xTi5 - 2xO12 (x = 0, 0.01, 0.02, 0.04) solid solutions have been investigated. It has been found that, in the Li4Ti5O12 spinel, lithium ions migrate from tetrahedral to octahedral positions with increasing temperature. Doping of chromium to the spinel favors an increase in the fraction of tetrahedrally coordinated lithium and hinders diffusion. © Pleiades Publishing, Ltd., 2010. Source

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