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Synthesis of copper-doped pitch-derived mesoporous carbon as sulfur host for high-performance Li-S battery.

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Bibliographic Details
Title: Synthesis of copper-doped pitch-derived mesoporous carbon as sulfur host for high-performance Li-S battery.
Authors: Fan, Dong-Ze1 (AUTHOR), Wang, Run-Ze1 (AUTHOR), Wang, Zeng-Rong2 (AUTHOR), Sun, Qiang1 (AUTHOR) sunq@smm.neu.edu.cn
Source: Journal of Industrial & Engineering Chemistry. Jul2026, Vol. 159, p534-543. 10p.
Subjects: Lithium sulfur batteries, Mesoporous materials, Oxidation-reduction reaction, Polysulfides, Energy storage, Sulfur
Abstract: Lithium-sulfur batteries are widely studied because of their exceptional theoretical energy density and specific capacity. However, their cycling stability is significantly compromised by the well-known shuttle effect, which leads to progressive capacity loss. While the introduction of mesoporous carbon materials into the cathode has effectively alleviated the above-mentioned issues, the inherent nonpolar nature of carbon limits its affinity for lithium polysulfides, thus failing to mitigate the shuttle effect. In this study, copper was incorporated into a mesoporous carbon host, enhancing the interaction between the host material and lithium polysulfides while preserving the mesoporous structure. The doped copper species act as active sites, improving the kinetics of sulfur redox reactions. When evaluated as a sulfur host in lithium-sulfur batteries, the composite material (with a pore size of 3 nm) delivered excellent cycling stability: a reversible capacity of 635 mA h g−1 after 400 cycles at 0.5 C and 491 mA h g−1 after 500 cycles at 2 C. These findings collectively underscore the feasibility and broad application prospects of incorporating metal species into mesoporous carbon as an effective strategy for high-performance lithium-sulfur batteries. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Lithium-sulfur batteries are widely studied because of their exceptional theoretical energy density and specific capacity. However, their cycling stability is significantly compromised by the well-known shuttle effect, which leads to progressive capacity loss. While the introduction of mesoporous carbon materials into the cathode has effectively alleviated the above-mentioned issues, the inherent nonpolar nature of carbon limits its affinity for lithium polysulfides, thus failing to mitigate the shuttle effect. In this study, copper was incorporated into a mesoporous carbon host, enhancing the interaction between the host material and lithium polysulfides while preserving the mesoporous structure. The doped copper species act as active sites, improving the kinetics of sulfur redox reactions. When evaluated as a sulfur host in lithium-sulfur batteries, the composite material (with a pore size of 3 nm) delivered excellent cycling stability: a reversible capacity of 635 mA h g−1 after 400 cycles at 0.5 C and 491 mA h g−1 after 500 cycles at 2 C. These findings collectively underscore the feasibility and broad application prospects of incorporating metal species into mesoporous carbon as an effective strategy for high-performance lithium-sulfur batteries. [ABSTRACT FROM AUTHOR]
ISSN:1226086X
DOI:10.1016/j.jiec.2026.01.007