Amine- and Amide-Functionalized Mesoporous Carbons: A Strategy for Improving Sulfur/Host Interactions in Li-S Batteries

Fretz, Samuel Joseph,1987Chalmers tekniska högskola,Chalmers University of Technology (author)

Lithium-sulfur (Li-S) batteries are of great interest due to their potentially high energy density, but the low electronic conductivity of both the sulfur (S-8) cathode active material and the final discharge product lithium sulfide (Li2S) require the use of a conductive host. Usually made of relatively hydrophobic carbon, such hosts are typically ill-suited to retain polar discharge products such as the intermediate lithium polysulfides (LiPs) and the final Li2S. Herein, we propose a route to increase the sulfur utilization by functionalizing the surface of ordered mesoporous carbon CMK3 with polar groups. These derivatized CMK3 materials are made using a simple two-step procedure of bromomethylation and subsequent nucleophilic substitution with amine or amide nucleophiles. We demonstrate that, compared to the unfunctionalized control, these modified CMK3 surfaces have considerably larger binding energies with LiPs and Li2S, which are proposed to aid the electrochemical conversion between S-8 and Li2S by keeping the LiPs species in close proximity to the carbon surface during Li-S battery cycling. As a result, the functionalized cathodes exhibit significantly improved specific capacities relative to their unmodified precursor.

Agostini, Marco,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)agostini (author)
Jankowski, Piotr,1990Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jpiotr (author)
Johansson, Patrik,1969Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jpatrik (author)
Matic, Aleksandar,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matic (author)
Palmqvist, Anders,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)adde (author)
Chalmers tekniska högskola (creator_code:org_t)

By the author/editor: Fretz, Samuel Jo ...; Agostini, Marco, ...; Jankowski, Piotr ...; Johansson, Patri ...; Matic, Aleksanda ...; Palmqvist, Ander ...

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NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Other Physics To ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Other Chemistry ...

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