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Nanofabrication of selenium/reduced graphene oxide composite with sulfur doping via solution co-impregnation for enhanced lithium-selenium batteries.

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Title: Nanofabrication of selenium/reduced graphene oxide composite with sulfur doping via solution co-impregnation for enhanced lithium-selenium batteries.
Authors: Lu, Bo1 (AUTHOR), Wang, Zeng-Rong1 (AUTHOR), Sun, Qiang1 (AUTHOR) sunq@smm.neu.edu.cn
Source: Journal of Electroanalytical Chemistry. Jul2023, Vol. 941, pN.PAG-N.PAG. 1p.
Subjects: Selenium, Nanofabrication, Sulfur oxides, Polysulfides, Chemical bonds, Graphene oxide, Transition metal oxides
Abstract: A sulfur-doped selenium/reduced graphene oxide composite (Se 68 -S 9 /rGO) was synthesized as a cathode material for Li-Se batteries via a hydrazine hydrate-solution. Wherein, the introduction of S could enhance the energy density, and the formation of C S and the bonding between Se and S effectively limited the dissolution of intermediates, significantly enhancing the electrochemical performance of the composite. As expected, the Se 68 -S 9 /rGO can still exhibit superior cycling performance with high Se and S content of ca. 80 wt%. [Display omitted] • Se 68 -S 9 /rGO was synthesized via a hydrazine hydrate-solution impregnation. • The C S and Se-S obviously limited the dissolution and generation of intermediates. • Se 68 -S 9 /rGO shows a capacity of 538 mA h g−1 at 0.5C after 200 cycles. Lithium-selenium batteries are still plagued by polyselenides dissolution and low utilization of active material. In the present work, sulfur-doped selenium/reduced graphene oxide composite (Se 68 -S 9 /rGO) was successfully designed and prepared by solution co-impregnation of selenium and sulfur within the rGO matrix, and further used as cathode materials in lithium-selenium batteries. The introduction of sulfur could form the C S chemical bond and the stable chemical bond between selenium and sulfur, which effectively limit the leaching of higher order soluble polyselenides intermediate as well as immobilizing Se, further enhancing the rate performance and the cycling stability of the Se 68 -S 9 /rGO cathode. With high selenium and sulfur content of ca. 80%, the Se 68 -S 9 /rGO cathode can achieve a capacity of 538 mA h g−1 after 200 cycles at a current density of 0.5 C, and a capacity of 473 mA h g−1 after 200 cycles at a current density of 1 C, exhibiting superior cycling performance. [ABSTRACT FROM AUTHOR]
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Abstract:A sulfur-doped selenium/reduced graphene oxide composite (Se 68 -S 9 /rGO) was synthesized as a cathode material for Li-Se batteries via a hydrazine hydrate-solution. Wherein, the introduction of S could enhance the energy density, and the formation of C S and the bonding between Se and S effectively limited the dissolution of intermediates, significantly enhancing the electrochemical performance of the composite. As expected, the Se 68 -S 9 /rGO can still exhibit superior cycling performance with high Se and S content of ca. 80 wt%. [Display omitted] • Se 68 -S 9 /rGO was synthesized via a hydrazine hydrate-solution impregnation. • The C S and Se-S obviously limited the dissolution and generation of intermediates. • Se 68 -S 9 /rGO shows a capacity of 538 mA h g−1 at 0.5C after 200 cycles. Lithium-selenium batteries are still plagued by polyselenides dissolution and low utilization of active material. In the present work, sulfur-doped selenium/reduced graphene oxide composite (Se 68 -S 9 /rGO) was successfully designed and prepared by solution co-impregnation of selenium and sulfur within the rGO matrix, and further used as cathode materials in lithium-selenium batteries. The introduction of sulfur could form the C S chemical bond and the stable chemical bond between selenium and sulfur, which effectively limit the leaching of higher order soluble polyselenides intermediate as well as immobilizing Se, further enhancing the rate performance and the cycling stability of the Se 68 -S 9 /rGO cathode. With high selenium and sulfur content of ca. 80%, the Se 68 -S 9 /rGO cathode can achieve a capacity of 538 mA h g−1 after 200 cycles at a current density of 0.5 C, and a capacity of 473 mA h g−1 after 200 cycles at a current density of 1 C, exhibiting superior cycling performance. [ABSTRACT FROM AUTHOR]
ISSN:15726657
DOI:10.1016/j.jelechem.2023.117545