多硫化物
材料科学
化学工程
纳米技术
阴极
储能
钙钛矿(结构)
作者
Liping Wang,Piotr Jankowski,Christian Njel,Werner Bauer,Zhenyou Li,Zhen Meng,Bosubabu Dasari,Tejs Vegge,Juan Maria García Lastra,Zhirong Zhao-Karger,Maximilian Fichtner
标识
DOI:10.1002/advs.202104605
摘要
Magnesium-Sulfur batteries are one of most appealing options among the post-lithium battery systems due to its potentially high energy density, safe and sustainable electrode materials. The major practical challenges are originated from the soluble magnesium polysulfide intermediates and their shuttling between the electrodes, which cause high overpotentials, low sulfur utilization, and poor Coulombic efficiency. Herein, a functional Mo6 S8 modified separator is designed to effectively address these issues. Both the experimental results and density functional theory calculations show that the electrochemically active Mo6 S8 layer has a superior adsorption capability of polysulfides and simultaneously acts as a mediator to accelerate the polysulfide conversion kinetics. Remarkably, the magnesium-sulfur cell assembled with the functional separator delivers a high specific energy density (942.9 mA h g-1 in the 1st cycle) and can be cycled at 0.2 C for 200 cycles with a Coulombic efficiency of 96%. This work demonstrates a new design concept toward high-performance metal-sulfur batteries.
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