排序方式: 共有73条查询结果,搜索用时 15 毫秒
1.
Kulova T. L. Karseeva E. I. Skundin A. M. Kachibaya E. I. Imnadze R. A. Paikidze T. V. 《Russian Journal of Electrochemistry》2004,40(5):494-499
A series of compounds with the general formula LiMn2 - x - y
Cr
x
Ni
y
O4, where x + y = 0.05, 0.5, or 1.0, is synthesized. It is shown that all these compounds are pure-phase spinels with parameter aequal to 0.8193-0.8236 nm. Doping a stoichiometric lithium-manganese spinel simultaneously with chromium and nickel makes the spinel structure stable. The initial specific capacity of a spinel depends on its doping degree. Doping LiMn2O4 with chromium and nickel simultaneously at an Mn : Cr : Ni ratio of 195 : 3 : 2 raises the spinel's specific capacity and reduces the cycling degradation. The change in the discharge capacity of LiMn1.95Cr0.03Ni0.02O4 electrodes cycled at 20, 0, and -14°C is determined. 相似文献
2.
Yu. E. Roginskaya F. Kh. Chibirova T. L. Kulova A. M. Skundin 《Russian Journal of Electrochemistry》2006,42(4):355-362
Products of lithium interaction with thin-film nanostructured SnO2-TiO2 (ST) oxides are studied with the aid of x-ray diffraction analysis and Moessbauer spectroscopy on the 119Sn nuclei. Electrochemical properties of a series of the ST electrodes with different concentrations of TiO2 varied from 0 to 20 mol % are also examined. It is concluded that the specific feature of the charge-discharge mechanism of the ST electrodes is a significant participation of oxygen in reversible reactions during insertion and extraction of lithium as compared with an alloying mechanism of operation of tin-containing anodes. The leading role in this is played by titanium oxide. Remaining stable towards reduction by lithium, it facilitates the holding of the neighboring layers of SnO2 in a nanodisperse state and in an oxidized state. The effect of a decrease in the capacity degradation in modified TiO2 electrodes, which is discovered in this work, is attributed to the hampering of the growth of nanocrystallites of β-Sn by interlayers of tin and titanium oxides mentioned above. 相似文献
3.
O. Yu. Grigor'eva T. L. Kulova S. V. Pushko A. M. Skundin 《Russian Journal of Electrochemistry》2002,38(12):1327-1333
Values of the diffusion coefficient for lithium in thermoexpanded graphite (TEG) are measured during cathodic intercalation from an aprotic electrolyte and during the TEG plate in contact with metallic lithium without electrolyte. In the course of cathodic intercalation, the diffusion coefficient is measured by method of galvanostatic switching-on curves. During TEG contact with lithium, the variation of x-ray diffraction pattern of TEG with time is recorded. It is established that during TEG contact with lithium the lattice spacing decreases and the characteristic size of TEG particles increases with time until the lithiation is complete and intercalate LiC6 forms. Values of the diffusion coefficient determined by either method coincide and amount to 10–10 cm2 s–1. 相似文献
4.
The main publications of recent years devoted to functional materials for positive electrodes of rechargeable lithium-ion batteries destined to work at the potential more positive than that of conventional lithiated oxides of cobalt and manganese are considered. The problem of electrolytes stable at these potentials is discussed briefly. 相似文献
5.
Russian Journal of Electrochemistry - In the recent years, attention is focused on phosphorus as the active material for negative electrodes of sodium-ion rechargeable batteries because it... 相似文献
6.
T. L. Kulova 《Russian Journal of Electrochemistry》2008,44(5):525-529
Irreversible processes accompanying the lithium incorporation into amorphous thin-film silicon are investigated. It is shown that the irreversible processes occurred during the cathodic polarization result in the formation of passive film at the silicon surface. The passive film at silicon is close, in its composition, to the passive film at carbonaceous materials. However, unlike the carbonaceous electrodes, no effect of electrolyte composition on the irreversible capacity of the silicon electrodes is observed. 相似文献
7.
8.
Chekannikov Andrey Kapaev Roman Novikova Svetlana Tabachkova Nataliya Kulova Tatiana Skundin Alexander Yaroslavtsev Andrey 《Journal of Solid State Electrochemistry》2017,21(6):1615-1624
Journal of Solid State Electrochemistry - Nanocomposite materials, Na3V2(PO4)3/C and Na3V2(PO4)3/C/Ag, were synthesized by a modified Pechini method. Their properties were characterized with the... 相似文献
9.
Yu. E. Roginskaya A. D. Shepelev T. Kh. Tenchurin E. D. Politova B. A. Loginov N. V. Kozlova T. L. Kulova A. M. Skundin 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2011,85(11):2013-2019
Composite polymer fibers with a composition of Si-C-O obtained by electrospinning of precursors solution containing polycarbosilane
or phenol formaldehyde resins with an admix of organic-silicon compounds were synthesized in order to find efficient new electrode
materials for lithium ion batteries. The composition and structure of pyrolized composite fibers were studied by means of
X-ray dispersive analysis and X-ray diffraction, Raman spectroscopy, and by AFM and SEM. It was shown that the composite fibers
(with a diameter of 0.5–1.5 μm) were nanostructured materials with carbon and silicon-oxy-carbide areas about 2–5 nm in size.
A model of the nanostructure of a skeleton for composite fibers synthesized is proposed. 相似文献
10.
Gavrilin I. M. Smolyaninov V. A. Dronov A. A. Gavrilov S. A. Trifonov A. Yu. Kulova T. L. Kuz’mina A. A. Skundin A. M. 《Russian Journal of Electrochemistry》2018,54(12):1111-1116
Russian Journal of Electrochemistry - Nanostructured germanium samples prepared by electrochemical deposition from aqueous solution of 0.05 М germanium oxide onto titanium substrate are... 相似文献