多硫化物
硫黄
氧化还原
溶解
阴极
化学工程
碳纤维
拉曼光谱
催化作用
化学
多孔性
材料科学
无机化学
电极
物理化学
电解质
有机化学
物理
光学
复合数
工程类
复合材料
作者
Jingyi Zhu,Xinji Dong,Qingkai Zeng,Fengxing Liang,Shunyan Ning,Guifang Wang,Pei Kang Shen,Shengqian Ma
标识
DOI:10.1016/j.cej.2023.141811
摘要
Poor conversion between sulfur and sulfur-related species and the dissolution of intermediates result in slow commercialization development. Herein, MnO-Mo2C heterogeneous particles supported on porous carbon (MnO-Mo2C/C) are synthesized using chitosan as a sulfur host for Li–S batteries. MnO-Mo2C heterogeneous particles possess superior calculated binding energies for sulfur redox and Fermi energy levels compared with single MnO and Mo2C, which suggests that MnO-Mo2C leads to a fast conversion of polysulfides and accelerates electron transport. In addition, in situ X-ray diffraction and Raman spectra measurements reveal mixed mechanisms of polysulfide conversion on MnO-Mo2C/C, wherein Li2S6 undergoes LiS3 and Li2S4 reduction reaction paths. The MnO-Mo2C/[email protected] cathode exhibits a high discharge specific capacity (929.6 mAh/g) and ultra-low decay rate of 0.019 % at 2C for 1200 cycles. Even at a sulfur loading of 8.0 mg cm−2, the MnO-Mo2C/[email protected] cathode exhibits a high reversible area capacity of 5.10 mAh cm−2.
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