Research output: Contribution to journal › Article › peer-review
Effect of Mechanical Activation and Carbon Coating on Electrochemistry of TiNb2O7 Anodes for Lithium-Ion Batteries. / Kosova, Nina V.; Tsydypylov, Dmitry Z.
In: Batteries, Vol. 8, No. 6, 52, 06.2022.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Effect of Mechanical Activation and Carbon Coating on Electrochemistry of TiNb2O7 Anodes for Lithium-Ion Batteries
AU - Kosova, Nina V.
AU - Tsydypylov, Dmitry Z.
N1 - Funding Information: Funding: The authors thank the Ministry of Science and Higher Education of the Russian Federation within the governmental order for the Institute of Solid State Chemistry and Mechanochemistry SB RAS (project FWUS-21-0006) for partial support of this work. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022/6
Y1 - 2022/6
N2 - TiNb2O7 anode material with a Wadsley–Roth crystallographic shear structure was prepared by solid-state synthesis at a relatively low temperature (1000◦C) and a short calcination time (4 h) using preliminary mechanical activation of the reagent mixture. The as-prepared final product was then ball milled in a planetary mill with and without carbon black. The crystal structure and morphology of the samples were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electrochemical performance was studied in a galvanostatic mode in varied voltage intervals and at different cycling rates in combination with in situ electrochemical impedance spectroscopy (EIS) measurements. The resistance measured using in situ EIS had the highest values at the end of the discharge and the lowest when charging. The lithium diffusion coefficient, determined by galvanostatic intermittent titration technique (GITT), in samples milled with and without carbon black was an order of magnitude higher than that for the pristine sample. It was shown that improved electrochemical performance of the carbon composite TiNb2O7/C (reversible capacity of 250 mAh g−1 at C/10 with Coulomb efficiency of ~99%) was associated with improved conductivity due to the formation of a conductive carbon matrix and uniform distribution of submicron particles by size.
AB - TiNb2O7 anode material with a Wadsley–Roth crystallographic shear structure was prepared by solid-state synthesis at a relatively low temperature (1000◦C) and a short calcination time (4 h) using preliminary mechanical activation of the reagent mixture. The as-prepared final product was then ball milled in a planetary mill with and without carbon black. The crystal structure and morphology of the samples were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electrochemical performance was studied in a galvanostatic mode in varied voltage intervals and at different cycling rates in combination with in situ electrochemical impedance spectroscopy (EIS) measurements. The resistance measured using in situ EIS had the highest values at the end of the discharge and the lowest when charging. The lithium diffusion coefficient, determined by galvanostatic intermittent titration technique (GITT), in samples milled with and without carbon black was an order of magnitude higher than that for the pristine sample. It was shown that improved electrochemical performance of the carbon composite TiNb2O7/C (reversible capacity of 250 mAh g−1 at C/10 with Coulomb efficiency of ~99%) was associated with improved conductivity due to the formation of a conductive carbon matrix and uniform distribution of submicron particles by size.
KW - carbon coating
KW - EIS
KW - galvanostatic cycling
KW - mechanical activation
KW - TiNbO
KW - TiNb2O7
UR - http://www.scopus.com/inward/record.url?scp=85132436300&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/08727a80-196c-3f89-8e96-3c2100f2aa21/
U2 - 10.3390/batteries8060052
DO - 10.3390/batteries8060052
M3 - Article
AN - SCOPUS:85132436300
VL - 8
JO - Batteries
JF - Batteries
SN - 2313-0105
IS - 6
M1 - 52
ER -
ID: 36559558