Facile Fabrication of Core-Shell Structure Fe3O4@C Nanodots for Enhanced Lithium-Sulfur Batteries

• 作者: Xiang-Rui He Yu-Jiao Zhang Li-Fan Yang Ji-Lu Zhao Hong-Tai Li Yi-Bo Gao Bao Wang Xiao-Dong Guo
• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Special Issue:Anode Materials for Rechargeable Batteries
• 页码范围: 410-416
• 页数: 7页
• 语种: 英文

摘要

Lithium sulfur battery (LSB) is widely considered as a next-generation battery system due to its high theoretical energy density of 2567 Wh kg-1.However,several inherent issues obstruct the business application of LSB.To address these issues,we assemble core-shell structure Fe3O4@C nanodots with 5 nm diameter as a valid sulfur host via a convenient organic pyrolysis treatment followed by calcination.The nanosized Fe3O4 particles could expose more chemisorption sites and inhibit the polysulfides shuttle.Moreover,the carbon layer could not only increase the conductivity but also ensure structural integrity during cyclic process.Furthermore,the mesoporous channels around Fe3O4@C could supply sufficient space to load sulfur and physically restrict the shuttle of polysulfides.Thus,the resultant S/Fe3O4@C cathode shows a highly initial capacity of 1089 mAh g-1 at 0.2 C,even retains 655 mAh g-1 over 200 cycles at 1 C.