Kaland Henning, Håskjold Fagerli Frode, Hadler-Jacobsen Jacob, Zhao-Karger Zhirong, Fichtner Maximilian, Wiik Kjell, Wagner Nils P
Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, 7491, Trondheim, Norway.
Helmholtz Institute Ulm (HIU), Electrochemical Energy Storage, Helmholtzstr. 11, 89081, Ulm, Germany.
ChemSusChem. 2021 Apr 22;14(8):1864-1873. doi: 10.1002/cssc.202100173. Epub 2021 Feb 24.
The realization of sustainable and cheap Mg-S batteries depends on significant improvements in cycling stability. Building on the immense research on cathode optimization from Li-S batteries, for the first time a beneficial role of MXenes for Mg-S batteries is reported. Through a facile, low-temperature vacuum-filtration technique, several novel current collector- and binder-free cathode films were developed, with either dipenthamethylene thiuram tetrasulfide (PMTT) or S nanoparticles as the source of redox-active sulfur. The importance of combining MXene with a high surface area co-host material, such as carbon nanotubes, was demonstrated. A positive effect of MXenes on the average voltage and reduced self-discharge was also discovered. Ascribed to the rich polar surface chemistry of Ti C T MXene, an almost doubling of the discharge capacity (530 vs. 290 mA h g ) was achieved by using MXene as a polysulfide-confining interlayer, obtaining a capacity retention of 83 % after 25 cycles.
可持续且廉价的镁硫电池的实现依赖于循环稳定性的显著提高。基于对锂硫电池正极优化的大量研究，首次报道了MXenes对镁硫电池的有益作用。通过一种简便的低温真空过滤技术，开发了几种新颖的无集流体和无粘结剂的正极薄膜，以双五亚甲基四硫化秋兰姆（PMTT）或硫纳米颗粒作为氧化还原活性硫的来源。证明了将MXene与高比表面积的共主体材料（如碳纳米管）相结合的重要性。还发现MXenes对平均电压和减少自放电有积极影响。由于Ti₃C₂Tₓ MXene丰富的极性表面化学性质，通过使用MXene作为多硫化物限制中间层，放电容量几乎翻倍（530 vs. 290 mA h g⁻¹），在25次循环后容量保持率达到83%。
