ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

For citation:

Volgin M. A., Kulikova L. N., Konoplyantseva N. A., Gridina N. A., L'vov A. L. Electrochemical behavior of boron- and cadmium-doped carbon fibers. Electrochemical Energetics, 2001, vol. 1, iss. 1, pp. 50-55.

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Language: 
Russian
Heading: 
Lithium electrochemical systems
Article type: 
Article
UDC: 
541.136

Electrochemical behavior of boron- and cadmium-doped carbon fibers

Autors: 
Volgin M. A., Saratov State University
Kulikova L. N., Saratov State University
Konoplyantseva N. A., Saratov State University
Gridina Nelli Aleksandrovna, Saratov State University
L'vov Arlen Leonidovich, Saratov State University
Abstract: 

With the aid of chronopotentiometry, voltammetry, and potentiostatic closure, the electrochemical characteristics of lithium intercalation to polyacrylonitrile carbon fiber was determined, namely, the capacitance, kinetic currents, lithium diffusion coefficient, autocharge currents. The study was made at 298 К in 1 M solutions of LiClO4 in some mixed organic solvents (propylene carbonate – dimethoxyethane 7:3, propylene carbonate – diethyl carbonate 3:1). Heteroatom introduction is shown to significantly raise the specific capacitance in comparison with the corresponding non-doped carbon fiber at a high reversibility by current (98-100%). The polarization characteristics of kinetic current is of the linear nature up to 0.300 V, which is evidence of a noticeable influence of the passivating film's ionic conduction properties on the lithium intercalation kinetics. The dopants (boron, cadmium) reduce the polarization resistance significantly in comparison with the corresponding non-doped carbon fiber. The diffusion coefficients of lithium in the boron- and boron-cadmium-doped carbon fiber is equal to (1.2-3.7)·10-11 and (0.9-2.2)·10-11 cm2/s, respectively.

Key words: 
lithium intercalation
doped carbon fiber
SEI
Acknowledgments: 
Работа выполнена при финансовой поддержке программы «Университеты России» (учетный номер проекта 990551).
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Received: 
05.12.2000
Accepted: 
10.02.2001
Published: 
30.06.2001