Developing conductive and electrocatalytic mediators in Li-S batteries

Modulating MoSe2 functional plane via doping-defect engineering strategy to develop conductive and electrocatalytic mediators in
Fe-MoSe2@rGO provides a promising avenue for producing a developed separator function for practical high-energy-density Li-S batteries. Fe-MoSe2@rGO-PP exhibits excellent cycling stability under lean E/S ratios and high sulfur loading. Credit Journal of Energy Chemistry (2022). DOI: 10.1016/j.jechem.2022.09.001

Lithium sulfide (Li-S) batteries are considered a promising and efficient energy storage system because of their high energy density (2600 Wh kg-1) and low sulfur material cost. However, numerous obstacles to the practical implementation of Li–S batteries remain, including low sulfur conductivity, the shuttle effect, and the requirement for an adequate volume change (80%) of sulfur during charging and discharging operations. These have limited the applicability of Li–S batteries.

Transition metal chalcogenides (TMDs), such as molybdenum diselenide (MoSe2), have received attention as a viable method for accelerating redox processes. However, the limited number of active sites in MoSe2 considerably reduces their overall electrocatalytic performance.

Metal doping into MoSe2 can improve the electronic conductivity of MoSe2 and generate , creating numerous reactive sites for catalytic reactions. Moreover, polysulfide transformation in the Li–S system can be improved through defect engineering, which can alter the physicochemical and to enhance the adsorption and catalytic properties of a material.

Recently, Yutao Dong and Jianmin Zhang (corresponding authors), Mohammed A. Al-Tahan (first author), and others published a manuscript titled "Modulating of MoSe2 functional plane via doping-defect engineering strategy for the development of conductive and electrocatalytic mediators in Li-S batteries" in the Journal of Energy Chemistry.

The authors demonstrate that introducing iron exposes more active selenium edge sites in MoSe2, which can selectively adsorb more lithium polysulfides (LiPSs) to minimize the shuttle effect. Moreover, the conductive feature of rGO improves the cell's electrical conductivity and promotes the adsorption of polysulfides via chemical bonding with the functional group of rGO. Therefore, using the Fe-MoSe2@rGO nanohybrid as a functional plane offers the advantages of high conductivity and effective LiPS adsorption.

More information: Mohammed A. Al-Tahan et al, Modulating of MoSe2 functional plane via doping-defect engineering strategy for the development of conductive and electrocatalytic mediators in Li-S batteries, Journal of Energy Chemistry (2022). DOI: 10.1016/j.jechem.2022.09.001

Citation: Developing conductive and electrocatalytic mediators in Li-S batteries (2022, September 23) retrieved 9 December 2022 from https://phys.org/news/2022-09-electrocatalytic-li-s-batteries.html
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