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Article
Synthesis of NASICON-Type Lithium Zirconium Phosphate
The chemical transformations involved in the synthesis of the NASICON-type compound LiZr2(PO4)3 were studied by thermogravimetry and x-ray diffraction. The results demonstrate that, during heat treatment of a 3Zr...
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Article
Ionic conduction in a grafted layer of organosilicate materials based on the mesostructured silicates MCM-41 and SBA-15
Mesostructured silicate materials with different pore sizes and grafted sulfonic groups have been synthesized and characterized by thermal analysis, IR spectroscopy, and impedance spectroscopy. The results ind...
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Article
Synthesis and ionic conductivity of silver magnesium zirconium molybdates
The silver magnesium zirconium molybdate Ag4Mg2Zr(MoO4), undoped and aliovalently doped with yttrium and aluminum, has been characterized by impedance spectroscopy, X-ray diffraction, and IR spectroscopy. The mat...
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Article
Phase transitions of the NASICON-type mixed phosphates LiM2(PO4)3 (M = Ti, Zr) and LiInNb(PO4)3
The structural phase transitions of LiTi2(PO4)3, LiInNb(PO4)3, and LiZr2(PO4)3 have been studied by X-ray diffraction, impedance spectroscopy, 7Li NMR spectroscopy, and calorimetry. The results indicate that, as ...
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Article
Microstructure and ion transport in Li1 + x Ti2 − x M x (PO4)3 (M = Cr, Fe, Al) NASICON-type materials
Li1 + x Ti2 − x M x (PO4)3 (M = Cr, Fe, Al) NASICON-type materials have been prepared by the Pechini process and solid-state reactions and charact...
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Article
Catalytic properties of composite materials based on mesoporous silica and zirconium hydrogen phosphate
We have synthesized composite materials based on SBA-15 mesoporous silica and zirconium phosphate. The materials have been characterized by scanning electron microscopy, transmission electron microscopy, induc...
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Article
Synthesis and ionic conductivity of Li4Ti5O12
Lithium titanate, Li4Ti5O12, has been synthesized by the Pechini process, citrate route, and EDTA-citrate route at various final annealing temperatures. The materials obtained have been characterized by scanning ...
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Article
Effect of particle size on the conductive and electrochemical properties of Li2ZnTi3O8
We have studied the effect of final annealing temperature on the formation of lithium zinc titanate, its electrical conductivity, and its electrochemical performance. Li2ZnTi3O8 has been shown to form in a wide r...
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Article
Low- and intermediate-temperature proton-conducting electrolytes
We consider the main achievements and problems in the field of proton-conducting solid electrolytes. Because of the extremely small proton radius, mechanisms of proton transport differ drastically from those f...
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Article
High-temperature and composite proton-conducting electrolytes
This paper presents a continuation of a review of research on proton-conducting solid electrolytes. We consider high-temperature proton-conducting materials based on mixed oxides of polyvalent elements whose s...
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Article
Electrochemical properties of Li4Ti5O12/C and Li4Ti5O12/C/Ag nanomaterials
We have prepared and characterized lithium titanate-based anode materials, Li4Ti5O12/C and Li4Ti5O12/C/Ag, using polyvinylidene fluoride as a carbon source. The formation of such materials has been shown to be ac...
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Article
Surface modification of zirconia with acid groups
We have studied the effect of surface modification with acids and subsequent heat treatment on the properties of hydrous zirconia. It has been shown that surface modification with phosphate and sulfate groups ...
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Article
Synthesis, Structure, IR-Spectroscopic Characterization, and Ionic Conductivity of Mg0.5Zr2(AsO4)x(PO4)3 − x
Mg0.5Zr2(AsO4)x(PO4)3 − x arsenate phosphates have been prepared by a sol–gel process and characterized by X-ray diffraction, IR spectroscopy, and impedance spectroscopy. The results indicate the formation of a c...
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Article
Effect of the Carbon Source on the Electrochemical Properties of Li4Ti5O12/C Composites Prepared by Solid-State Synthesis
Li4Ti5O12/C composite anode materials have been prepared by solid-state reactions using lithium- or titanium-containing reagents (lithium lactate, acetate, and acetylacetonate or titanium oxyacetylacetonate) not ...
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Article
Cathode Materials Based on Lithium Iron Phosphate/PEDOT Composites for Lithium-Ion Batteries
Composites based on LiFePO4/C and poly(3,4-ethylenedioxythiophene) (LiFePO4/C/PEDOT) have been prepared via in situ oxidative EDOT polymerization or mechanical mixing of LiFePO4/C with presynthesized PEDOT partic...
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Article
Influence of Mechanical Processing and the Procedure Used to Introduce a Carbon Material on the Electrochemical Properties of Li4Ti5O12/C Composites
Li4Ti5O12/C anode materials of different particle size have been prepared by a sol–gel process, followed by mechanical processing in a planetary mill. Carbon was introduced both by an in situ process and by mecha...
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Article
LiFePO4/Carbon Nanomaterial Composites for Cathodes of High-Power Lithium Ion Batteries
Using a simple and technological approach, we have fabricated composites based on a lithium iron phosphate (LFP) with the olivine structure and a carbon coating containing 5–10% carbon nanotubes (CNTs) or nano...
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Article
Synthesis and Ionic Conductivity of Lithium Titanium Phosphate-Based Solid Electrolytes
The processes occurring during the solid-state synthesis of germanium-doped lithium titanium phosphate have been studied. The formation of LiTi2 – xGex(PO4)3 has been shown to proceed through the titanium pyropho...
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Article
Phase Formation and Ionic Conductivity of Na1 + 2xZnxZr2 – x(PO4)3 Phosphates
Na1 + 2xZnxZr2 – x(PO4)3 phosphates have been prepared by a sol–gel process followed by heat treatment. A limited series (0 ≤ x ≤ 0.4) of solid solutions with the NASICON structure has been obtained in the system...
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Article
Effect of High-Molecular-Weight Carbon Sources on the Electrochemical Properties of Li4Ti5O12/C Composite Materials
Lithium titanate-based (Li4Ti5O12/C) composite anode materials have been synthesized by a sol–gel process with the use of high-molecular-weight compounds (polystyrene, polyethylene glycol, or polyvinylidene fluor...