Gas sorption porosimetry for the evaluation of hard carbons as anodes for Li- and Na-ion batteries.

Autor: Matsukawa Y; Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan., Linsenmann F; Chair for Technical Electrochemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstr. 4, Garching bei München 85748, Germany., Plass MA; Nanochemistry Department, Max Planck Institute for Solid State Research, Heisenbergstraße 1, Stuttgart 70569, Germany., Hasegawa G; Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan., Hayashi K; Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan., Fellinger TP; Chair for Technical Electrochemistry, Department of Chemistry, Technical University of Munich, Lichtenbergstr. 4, Garching bei München 85748, Germany.
Jazyk: angličtina
Zdroj: Beilstein journal of nanotechnology [Beilstein J Nanotechnol] 2020 Aug 14; Vol. 11, pp. 1217-1229. Date of Electronic Publication: 2020 Aug 14 (Print Publication: 2020).
DOI: 10.3762/bjnano.11.106
Abstrakt: Hard carbons are promising candidates for high-capacity anode materials in alkali metal-ion batteries, such as lithium- and sodium-ion batteries. High reversible capacities are often coming along with high irreversible capacity losses during the first cycles, limiting commercial viability. The trade-off to maximize the reversible capacities and simultaneously minimizing irreversible losses can be achieved by tuning the exact architecture of the subnanometric pore system inside the carbon particles. Since the characterization of small pores is nontrivial, we herein employ Kr, N 2 and CO 2 gas sorption porosimetry, as well as H 2 O vapor sorption porosimetry, to investigate eight hard carbons. Electrochemical lithium as well as sodium storage tests are compared to the obtained apparent surface areas and pore volumes. H 2 O, and more importantly CO 2 , sorption porosimetry turned out to be the preferred methods to evaluate the likelihood for excessive irreversible capacities. The methods are also useful to select the relatively most promising active materials within chemically similar materials. A quantitative relation of porosity descriptors to the obtained capacities remains a scientific challenge.
(Copyright © 2020, Matsukawa et al.; licensee Beilstein-Institut.)
Databáze: MEDLINE
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