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Strain Engineering of a MXene/CNT Hierarchical Porous Hollow Microsphere Electrocatalyst for a High‐Efficiency Lithium Polysulfide Conversion Process
Author(s) -
Wang Xin,
Luo Dan,
Wang Jiayi,
Sun Zhenghao,
Cui Guoliang,
Chen Yuxuan,
Wang Tong,
Zheng Lirong,
Zhao Yan,
Shui Lingling,
Zhou Guofu,
Kempa Krzysztof,
Zhang Yongguang,
Chen Zhongwei
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202011493
Subject(s) - electrocatalyst , polysulfide , materials science , chemical engineering , nanosheet , catalysis , porosity , nanotechnology , composite number , carbon nanotube , electrochemistry , electrode , composite material , chemistry , organic chemistry , engineering , electrolyte
Tensile‐strained Mxene/carbon nanotube (CNT) porous microspheres were developed as an electrocatalyst for the lithium polysulfide (LiPS) redox reaction. The internal stress on the surface results in lattice distortion with expanding Ti−Ti bonds, endowing the Mxene nanosheet with abundant active sites and regulating the d‐band center of Ti atoms upshifted closer to the Fermi level, leading to strengthened LiPS adsorbability and accelerated catalytic conversion. The macroporous framework offers uniformed sulfur distribution, potent sulfur immobilization, and large surface area. The composite interwoven by CNT tentacle enhances conductivity and prevents the restacking of Mxene sheets. This combination of tensile strain effect and hierarchical architecture design results in smooth and favorable trapping–diffusion–conversion of LiPS on the interface. The Li‐S battery exhibits an initial capacity of 1451 mAh g −1 at 0.2 C, rate capability up to 8 C, and prolonged cycle life.