LiFePO4 as a Material for the Potentiometric Sensor

Lithium iron phosphate is a rather unique material demonstrating good reversibility in charge-discharge cycles despite the presence of several consecutive stages of the process, including a phase transition

Predictive and migration trends of Russia in the context of Covid-19 pandemic and post-coronavirus world

This work discusses the trends of the world migration processes development in the context of global COVID-19 pandemic reflected in mass-media practices, network communication and scientific analyses. The methodology of this research is based on systematic methods of evaluating messages in the media and social networks, as well as network analysis techniques, mass media practices and migrant rhetoric in public materials by highlighting, comparing, evaluating and conceptualizing the trends in transformation of migration processes under the influence of global changes caused by the pandemic. The study proves that the global migration processes and migration in the Russian Federation are in crisis under the influence of the global COVID-19 pandemic

Electrodeposition of Polymer Electrolyte Into Porous LiNi0.5Mn1.5O4 for High Performance All-Solid-State Microbatteries

We report the electrodeposition of polymer electrolyte (PMMA-PEG) in porous lithium nickel manganese oxide (LiNi0.5Mn1.5O4) cathode layer by cyclic voltammetry. The cathode-electrolyte interface of the polymer-coated LNMO electrode has been characterized by scanning electron microscopy and electrochemical techniques. Electrochemical measurements consisting of galvanostatic cycling tests and electrochemical impedance spectroscopy revealed a significant improvement of the capacity values and the increase of the operating voltage. These effects are attributed to the total filling of pores by the electrodeposited polymer that contributes to improve the reversible insertion of Li+. A complete all-solid-state microbattery consisting of electropolymerized LNMO as the cathode, a thin polymer layer as the electrolyte, and TiO2 nanotubes as the anode has been successfully fabricated and tested

Potentiometric Control of Metal Concentration for Chelation Kinetics of Modified Polyimide Films

Interaction of modified polyimide films with agrentium nitrate solutions of various concentrations was studied. Sorption of Ag ions by films is divided into three steps: formation of Ag ion layer on the border of film surface; diffusion inside the films; and final saturation of film by Ag ions. The data are confirmed by calculation of weight of the sorbed Ag ions onto the films with various thicknesses. Electrochemical Ag loading of PI films includes two parallel reactions: film dissolution accompanied by chelation

Effect of Modification on Electrochemical Chelation of Polyimide Films

Novel procedure of electrochemical chelation of polyimide films was developed. The kinetics of silver cation sorptions into the films during the chelation was found out. The effect of modification treatment of film surfaces on kinetics of electrochemical process was studied. The stabilization of ion-sorbed layer of films occurs in water-isopropanol solvents. Sorption of silver during electrochemical deposition is 0.75-1.5 mg per 100 µm of polyimide depending on modification solution. Thus, the most appropriate morphological modification with about 1.5 mg/100 µm take places in heterocyclic solvents. The resulting metallized polyimide films show good non-washing out adhesion of metal into gel-like structured surfacial layers of the film

A Comparative Study of Intramolecular Mobility of Single Siloxane and Carbosilane Dendrimers via Molecular Dynamics Simulations

A comparative analysis of intramolecular dynamics of four types of isolated dendrimers from the fourth to the seventh generations belonging to the siloxane and carbosilane families, differing in spacer length, core functionality, and the type of chemical bonds, has been performed via atomic molecular dynamics simulations. The average radial and angular positions of all Si branching atoms of various topological layers within the dendrimer interior, as well as their variations, have been calculated, and the distributions of the relaxation times of their radial and angular motions have been found. It has been shown that the dendrons of all the dendrimers elongate from the center and decrease in a solid angle with an increasing generation number. The characteristic relaxation times of both angular and radial motions of Si atoms are of the order of a few nanoseconds, and they increase with an increasing generation number and decrease with temperature, with the angular relaxation times being larger than the radial ones. The relaxation times in the carbosilanes are larger than those in the siloxanes. The rotational angle dynamics of the carbosilane dendrimers show that the chain bending is mainly realized via trans-gauche transitions in the Si branching bonds

IMPACT OF SUBSTRATE SURFACE PREPARATION METHOD ON SEI FORMATION REGULARITIES DURING ELECTROCHEMICAL DEPOSITION OF LITHIUM

The use of lithium metal as an anode for batteries has undeniable advantages because this metal has the most negative reduction potential and the highest theoretical specific capacity. The reduction of lithium metal initially involves processes of solution components decomposition with the formation of SEI - a film of interfacial electrolyte, under which lithium is further deposited. Reversible lithium deposition requires it to have pure ionic conductivity and high mechanical strength

Quazi-likelihood estimation of motion parameters of rapidly fluctuating target during the probing with a sequence of optical pulses

Characteristics of efficient estimates of the range, velocity, and acceleration of a rapidly fluctuating target have been obtained during the probing with a sequence of optical pulses. The losses in estimation accuracy of the range, velocity, and acceleration caused by the presence of non-informative parameters have been also found

LiFePO4 as a Material for the Potentiometric Sensor

Lithium iron phosphate is a rather unique material demonstrating good reversibility in charge-discharge cycles despite the presence of several consecutive stages of the process, including a phase transition