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Impact of the electrical conductivity on the lithium capacity of polymer-derived silicon oxycarbide (SiOC) ceramics

Kaspar, Jan and Graczyk-Zajac, Magdalena and Choudhury, Soumyadip and Riedel, Ralf (2016):
Impact of the electrical conductivity on the lithium capacity of polymer-derived silicon oxycarbide (SiOC) ceramics.
In: Electrochimica Acta, Elsevier Science Publishing, pp. 196-202, 216, ISSN 00134686,
[Online-Edition: http://dx.doi.org/10.1016/j.electacta.2016.08.121],
[Article]

Abstract

Within this work, we systematically investigate the influence of the amount of free carbon phase on the electrical conductivity and the lithium storage capability of silicon oxycarbide (SiOC) materials. A series of SiOC ceramics comprised of free carbon content ranging from 8 to 54 wt.% is examined. The ability to reversibly host lithium ions is correlated with the elemental composition and the electrical conductivity. The materials with low carbon content up to ∼20 wt.% reveal conductivities lower than 3 10−5 S m−1 and initially high capacities of more than 1000 mAh g−1, which fade rapidly with continuous cycling. For the samples with higher amounts of free carbon phase, higher electrical conductivities ranging from 0.07 to 2.2 S m−1 are measured. In comparison to the carbon-poor materials, the carbon-rich samples demonstrate enhanced accessibility of Li-ion storing sites with capacities of more than 500 mAh g−1. Moreover, a linear dependence between a stable capacity after 60 cycles and free carbon content in the ceramic is found.

Item Type: Article
Erschienen: 2016
Creators: Kaspar, Jan and Graczyk-Zajac, Magdalena and Choudhury, Soumyadip and Riedel, Ralf
Title: Impact of the electrical conductivity on the lithium capacity of polymer-derived silicon oxycarbide (SiOC) ceramics
Language: English
Abstract:

Within this work, we systematically investigate the influence of the amount of free carbon phase on the electrical conductivity and the lithium storage capability of silicon oxycarbide (SiOC) materials. A series of SiOC ceramics comprised of free carbon content ranging from 8 to 54 wt.% is examined. The ability to reversibly host lithium ions is correlated with the elemental composition and the electrical conductivity. The materials with low carbon content up to ∼20 wt.% reveal conductivities lower than 3 10−5 S m−1 and initially high capacities of more than 1000 mAh g−1, which fade rapidly with continuous cycling. For the samples with higher amounts of free carbon phase, higher electrical conductivities ranging from 0.07 to 2.2 S m−1 are measured. In comparison to the carbon-poor materials, the carbon-rich samples demonstrate enhanced accessibility of Li-ion storing sites with capacities of more than 500 mAh g−1. Moreover, a linear dependence between a stable capacity after 60 cycles and free carbon content in the ceramic is found.

Journal or Publication Title: Electrochimica Acta
Volume: 216
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Li-ion battery, polymer-derived SiOC, electrical conductivity, carbon content
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 04 Jan 2017 09:30
Official URL: http://dx.doi.org/10.1016/j.electacta.2016.08.121
Identification Number: doi:10.1016/j.electacta.2016.08.121
Funders: This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG), Germany within the priority program SPP1473/JP8.
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