Cobalt Nanoparticles Loaded on MXene for Li-S Batteries: Anchoring Polysulfides and Accelerating Redox Reactions

被引:36
作者
Gu, Qinhua [1 ,2 ]
Qi, Yujie [1 ,2 ]
Chen, Junnan [1 ,2 ]
Lu, Ming [1 ,3 ]
Zhang, Bingsen [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
[3] Jilin Normal Univ, Key Lab Funct Mat Phys & Chem, Key Lab Preparat & Applicat Environm Friendly Mat, Minist Educ,Joint Lab MXene Mat, Changchun 130103, Peoples R China
基金
中国国家自然科学基金;
关键词
catalysis; Co; lithium-sulfur batteries; MXenes; shuttle effect; METAL SULFIDES; SULFUR; CARBON; PERFORMANCE; NANOSHEETS; OXIDATION; DESIGN;
D O I
10.1002/smll.202204005
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Catalysis is regarded as an effective strategy to fundamentally increase sulfur utilization, accelerating the kinetics of the transformation between lithium polysulfides (LiPSs) and lithium sulfide (Li2S) on a substrate. However, the intermodulation of catalysts and sulfur species is elusive, which is limited to the comprehensive analysis of electrochemical performance in the dynamic reaction process. Herein, cobalt nanoparticles loaded on MXene nanosheets (Co/Ti2C) are selected as sulfur hosts and the representative catalyst. By combining ex situ electrochemical results and interfacial structural chemical monitoring, the catalysis process of Co/Ti2C toward LiPSs conversion is revealed, and the outstanding performance originates from the optimization of chemical adsorption, catalytic activity, and lithium-ion transfer behaviors, which is based on electronic/ion modulation and sufficient interfaces among catalysts and electrolyte. This work can guide the construction of electronic modulation at triple-phase interface catalysis to overcome the shuttle effect and facilitate sulfur redox kinetics in Li-S batteries.
引用
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页数:8
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