Exquisitely constructing hierarchical carbon nanoarchitectures decorated with sulfides for high-performance Li-S batteries

被引:0
作者
Deng, Siyu [1 ]
Lv, Yanwei [1 ]
Zhao, Yang [1 ]
Lu, Huiqing [1 ]
Han, Zuqi [1 ]
Wu, Lili [1 ]
Zhang, Xitian [1 ]
机构
[1] Harbin Normal Univ, Sch Phys & Elect Engn, Key Lab Photon & Elect Bandgap Mat, Minist Educ, Harbin 150025, Peoples R China
基金
中国国家自然科学基金;
关键词
LITHIUM-SULFUR BATTERIES; DISULFIDE; SEPARATOR;
D O I
10.1039/d3dt04163h
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The sluggish reaction kinetics and notorious shuttle effect of polysulfides significantly hinder the practical application of lithium-sulfur batteries (LSBs). Therefore, polysulfides are anchored and their conversion reactions are catalyzed to enhance the performance of LSBs. Herein, an exquisite hierarchical carbon nanoarchitecture decorated with sulfides is designed and introduced into LSBs. Systematic experiments show that the nanoarchitecture not only enables rapid electron/ion migration but also functions as an active catalyst to increase polysulfide conversion, thus effectively reducing the shuttle effect. As a result, LSBs with the nanoarchitecture modified separator exhibited outstanding rate capacity (724.9 mA h g-1 at 5C), low self-discharge capacity loss (4.1% capacity loss after 72 h), and exceptional reversible capacity (1518.3 mA h g-1 at 0.1C and 25.6% capacity loss after 100 cycles). Through the design of a multifunctional separator, this study offers an effective way to minimize the shuttle effect and speed up redox conversion. The strategy of constructing nanoarchitectures provides an innovative route for hierarchical heterocatalyst design for LSBs. An exquisite CoS2-NC-CNTs@MoS2 nanoarchitecture is designed to remedy the polysulfide shuttle effect and conversion kinetics as a separator modifier for efficient lithium-sulfur batteries.
引用
收藏
页码:4753 / 4763
页数:11
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