The laboratory works with hybrid materials for electrochemical energy storage devises.
Carbon nanomaterials (nanotubes, graphene, mesoporous carbon, soot, nanofibres) are the most promising electrode materials for supercapacitors and Li-ion batteries. Their important characteristics (high specific surface area, pore size and quantity, stability, conductivity, variety of structures and material participation in electrochemical processes) contribute to the increase in electrochemical parameters and require careful study.
Increasing the functionality of carbon nanomaterials can be obtained by creating hybrid materials (covering carbon nanomaterials with transition metal oxides, electrically conductive polymers, pyrolytic carbon) and activating of the electrode materials surface (chemical and electrochemical processes).
Modern and promising methods of synthesis and modification of the carbon materials – CCVD-, hydrothermal, thermobaric and "wet" synthesis, mechanical and electrochemical processing, etc.
The main directions of scientific work:
Methods of diagnostics of the electrode materials
The study of morphology, functional composition and electronic interaction of electrode materials allows to optimize synthetic approaches and to find optimal electrochemical indices. Investigation of the surface morphology is carried out with scanning and transmission electron microscopy, measuring of the specific surface area. The functional composition is investigated by Raman spectroscopy, infrared and X-ray photoelectron spectroscopy. An important task is to study the electronic state of electrode materials in the process of charge and discharge processes, as well as changes in their functional composition, since this will solve both the fundamental problems of understanding processes in a double layer, and maximize the morphology and functional composition of electrode materials.
Investigation of the electrochemical properties
Cyclic voltammetry allows to determine many characteristics of the material (specific capacity and energy) and to investigate the reactions occurring in the electrode material during its operation. Charge-discharge stations allow to calculate the capacity and stability of the material. Impedance spectroscopy provides information on the processes of charge transfer in the material, the electrolyte, and at the interface. In some cases (for example, Li-ion batteries and capacitors with organic electrolytes) operation in an oxygen-free environment is required, for which an argon glovebox is used.
Creating prototype devices
The work of the laboratory is aimed at creating prototypes of the new generation high-capacity capacitors (supercapacitors) and Li-ion batteries. The variety of materials allows developing both devices of high power and capacity for cars and trains, as well as highly efficient, lightweight, flexible electrodes for modern gadgets. In order to create prototypes, it is necessary not only to study the properties of materials in the most detailed way, but also to choose the optimal components of the device – electrolyte, lining, shells, separators, assembly scheme, which investigates methods of application, drying, pressing materials and assembling devices.
Head of the laboratory:
PhD Fedorovskaya Ekaterina
Universite Paul Sabatier
Beijing university of chemical technology
Lappeenranta University of Technology
Institute of Materials