Authors: Henning Kaland
Title: MXene-Sulfur Composite Cathode for Magnesium-Sulfur Batteries
Affiliation: Norwegian University of Science and Technology
Abstract
Mg-S batteries represent a promising approach, combining cheap, safe and abundant elements with a high theoretical energy density. The present main issue is that the soluble intermediate discharge products, Mg polysulfides, diffuse and/or migrate to the Mg anode and passivates it [1]. A common strategy to impede the polysulfide shuttling in Li-S batteries, is to mix the sulfur with a matrix material with high polysulfide affinity, where MXenes have demonstrated promising results [2]. In this work, Ti3C2Tx MXene has been investigated as sulfur matrix material for Mg-S batteries. Although the fabricated MXene-sulfur composite cathodes showed improved electrochemical performance compared to a carbon-based composite, the MXene-sulfur composite was still found to suffer from severe polysulfide shuttling, as evidenced by post mortem analysis.
References:
[1] Salama et al. ACS Appl. Mater. Interfaces. 2018, 10, 36910−36917
[2] Tang et al. Adv. Funct. Mater. 2019, 1901907