Tuning the crystallinity of titanium nitride on copper-embedded carbon nanofiber interlayers for accelerated electrochemical kinetics in lithium-sulfur batteries  

作　　者：Yinyu Xiang Liqiang Lu Feng Yan Debarun Sengupta Petra Rudolf Ajay Giri Prakash Kottapalli Yutao Pei 

机构地区：[1]Advanced Production Engineering,Engineering and Technology Institute Groningen,University of Groningen,Groningen,The Netherlands [2]Zernike Institute for Advanced Materials,University of Groningen,Groningen,The Netherlands

出　　处：《Carbon Energy》2024年第6期40-55,共16页碳能源（英文）

基　　金：China Scholarship Council,Grant/Award Number:201806950083;Advanced Materials research program of the Zernike National Research Centre;Faculty of Science and Engineering(FSE),University of Groningen。

摘　　要：The development of lithium-sulfur(Li-S)batteries is hindered by the disadvantages of shuttling of polysulfides and the sluggish redox kinetics of the conversion of sulfur species during discharge and charge.Herein,the crystallinities of a titanium nitride(TiN)film on copper-embedded carbon nanofibers(Cu-CNFs)are regulated and the nanofibers are used as interlayers to resolve the aforementioned crucial issues.A low-crystalline TiN-coated Cu-CNF(L-TiN-Cu-CNF)interlayer is compared with its highly crystalline counterpart(H-TiN-Cu-CNFs).It is demonstrated that the L-TiN coating not only strengthens the chemical adsorption toward polysulfides but also greatly accelerates the electrochemical conversion of polysulfides.Due to robust carbon frameworks and enhanced kinetics,impressive highrate performance at 2 C(913 mAh g^(-1)based on sulfur)as well as remarkable cyclic stability up to 300 cycles(626 mAh g^(-1))with capacity retention of 46.5%is realized for L-TiN-Cu-CNF interlayer-configured Li-S batteries.Even under high loading(3.8 mg cm^(-2))of sulfur and relatively lean electrolyte(10μL electrolyte per milligram sulfur)conditions,the Li-S battery equipped with L-TiN-Cu-CNF interlayers delivers a high capacity of 1144 mAh g^(-1)with cathodic capacity of 4.25 mAh cm^(-2)at 0.1 C,providing a potential pathway toward the design of multifunctional interlayers for highly efficient Li-S batteries.

关 键 词：CRYSTALLINITY electrochemical kinetics INTERLAYER lithium-sulfur batteries titanium nitride 

分 类 号：TM912[电气工程—电力电子与电力传动]