Maxim Zakharkin

Maxim Zakharkin
Skolkovo Institute of Science and Technology | Skoltech · Center for Electrochemical Energy Storage

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18
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369
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Publications

Publications (18)
Article
Full-text available
Sodium-ion batteries are a technology rapidly approaching widespread adoption, so studying the thermal stability and safety of their components is a pressing issue. In this work, we employed differential scanning calorimetry (DSC) and ex situ powder X-ray diffraction to study the thermal stability of several types of sodium-ion electrolytes (NaClO4...
Article
Because of environmental benignity, abundance, and promising electrochemical properties, potassium-ion batteries have been appealing to the attention of academic society. Herein, we report on KTiPO4F as a novel Ti-containing polyanionic...
Article
Full-text available
Sodium-ion batteries are a promising class of secondary power sources that can replace some of the lithium-ion, lead–acid, and other types of batteries in large-scale applications. One of the critical parameters for their potential use is high efficiency in a wide temperature range, particularly below 0 °C. This article analyzes the phase equilibri...
Article
NASICON-type NaNbV(PO4)3 electrode material synthesized by the Pechini sol-gel technique undergoes a reversible three-electron reaction in a Na-ion cell which corresponds to the Nb5+/Nb4+, Nb4+/Nb3+, and V3+/V2+ redox processes and provides a reversible capacity of 180 mAh·g-1. The sodium insertion/extraction takes place in a narrow potential range...
Article
Full-text available
The thermal stability of NASICON-type cathode materials for sodium-ion batteries was studied using differential scanning calorimetry (DSC) and in situ high-temperature powder X-ray diffraction (HTPXRD) applied to the electrodes in a pristine or charged state. Na3V2(PO4)3 and Na4VMn(PO4)3 were analyzed for their peak temperatures and the exothermic...
Article
Full-text available
Sodium-ion battery technology rapidly develops in the post-lithium-ion landscape. Among the variety of studied anode materials, hard carbons appear to be the realistic candidates because of their electrochemical performance and relative ease of production. This class of materials can be obtained from a variety of precursors, and the most ecological...
Article
The recently demonstrated possibility of high-voltage extraction of more than 2 Na ions per Na4MnV(PO4)3 formula unit is considered as a possible way to increase the specific energy of this material, which would open up prospects for its application in sodium-ion batteries. However, for the Na4MnV(PO4)3 material and for a wide group of related NASI...
Article
Full-text available
Here we introduce a new NASICON-type Na 3 VSc(PO 4 ) 3 positive electrode material for Na-ion batteries demonstrating reversible (de)intercalation of 3 Na cations per formula unit within a wide voltage range with complex voltage-composition dependence. The total electrochemical capacity of the material is 170 mAh/g, which corresponds to the complet...
Article
NASICON-type Na3V2(PO4)3 cathode materials can be regarded as promising candidates for high-power Na-ion batteries due to the observed facile kinetics of Na-ion de/intercalation. Substitution of V for Mn provides additional advantages related to the increase in the average operating potential and reduced cost of the active material. In this work, w...
Article
NASICON-structured cathode materials are considered as possible candidates for high-performance Na-ion batteries. Further increase of energy density of the Na3V2(PO4)3 may be achieved by substitution of the V cations by other transition metals. Here, we show that a family of Na3+xMnxV2-x(PO4)3 (0≤x≤1, Δx=0.2) cathode materials demonstrates remarkab...
Article
Efficient polyacrylonitrile-based gel-polymer electrolyte for sodium-ion batteries was prepared using commercially available copolymer poly(acrylonitrile-co-methyl acrylate), propylene carbonate as plasticizer, and NaClO4 or NaPF6 as electrolyte salts. Specific and molar conductivities were determined at different salt concentrations using the ac i...
Article
Application of different diffraction and spectroscopic techniques to operando studies on the electrode materials became an integral part of the metal-ion battery research. Combination of novel operando electrochemical cell with sapphire windows [1], synchrotron X-ray diffraction (SXRD) and Mössbauer spectroscopy (MS) has enabled us to study crystal...
Article
NASICON-type Na 3 V 2 (PO 4 ) 3 delivers a highly reversible capacity of more than 110 mAh/g, showing a voltage plateau at 3.4 V corresponding to the V ⁴⁺ /V ³⁺ redox couple [1]. In Na 3+x Mn x V 2-x (PO 4 ) 3 , introduction of Mn(II) lowers the cost of the material and enhances the operation voltage compared to that in Na 3 V 2 (PO 4 ) 3 [2]. Here...
Article
Sodium (de)intercalation in the Na4MnV(PO4)3 NASICON-type cathode has been studied with operando synchrotron X-ray powder diffraction and galvanostatic cycling up to 3.8 V and 4.0 V cut-off voltages. Symmetry reduction from rhombohedral to monoclinic was observed immediately after the start of the electrochemical desodiation, with restoring of the...
Article
High-voltage stability of LiBF4 - propylene carbonate solutions in intermediate concentration range is studied by means of cyclic voltammetry, galvanostatic cycling and X-ray photoelectron spectroscopy using LiCoPO4 and LiNi0.5Mn1.5O4 cathode materials. Coulombic efficiency improves with increasing salt-to-solvent molar ratio from 1:12 to 1:4 (∼0.8...
Article
The charge transfer kinetics of lithium ion intercalation into LixMn2O4 cathode materials was examined in dilute and concentrated aqueous and carbonate LiTFSI solutions using electrochemical methods. Distinctive trends in ion intercalation rates were observed between water-based and ethylene carbonate/diethyl carbonate solutions. The influence of t...
Article
Full-text available
The in-plane conductivity of solid solution La1–xSrxF3–x (x = 0 ÷ 0.24) films with thicknesses from 40 to 260 nm grown on glass-ceramics based on SiO2, Al2O3, CaF2 (111) and MgO (100) substrates, and LaF3-SrF2 heterostructures grown on MgO (100) substrates were studied by impedance spectroscopy at temperature range from room temperature to 300 °C a...

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