Fe^(3+)-stabilized Ti_(3)C_(2)T_(x) MXene enables ultrastable Li-ion storage at low temperature  

作　　者：Nana Zhao Fengchu Zhang Fei Zhan Ding Yi Yijun Yang Weibin Cui Xi Wang 

机构地区：[1]Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Department of Physics and Chemistry of Materials,School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]Key Laboratory of Luminescence and Optical Information,Ministry of Education,School of Science,Beijingjiaotong University,Beijing 100044,China [3]Chemistry and Chemical Engineering Guangdong Laboratory,Shantou 515031,China

出　　处：《Journal of Materials Science & Technology》2021年第8期156-164,共9页材料科学技术（英文版）

基　　金：supported financially by the Fundamental Research Funds for the Central Universities(Nos.2019RC021,2018JBZ107,2019RC035);the National Natural Science Foundation of China(Nos.51971056,91961125,51802013,21905019);the Key Program for International S&T Cooperation Projects of China from the Ministry of Science and Technology of China(No.2018YFE0124600);the Chemistry and Chemical Engineering Guangdong Laboratory(Nos.1932004 and 1911021);the financial support from Natural Science Foundation of Liaoning Province(No.20180510003);support from the“Excellent One Hundred”Project of Beijing Jiaotong University。

摘　　要：It is highly important to develop ultrastable electrode materials for Li-ion batteries(LIBs),especially in the low temperature.Herein,we report Fe^(3+)-stabilized Ti_(3)C_(2)T_(x) MXene(donated as T/F-4:1)as the anode material,which exhibits an ultrastable low-temperature Li-ion storage property(135.2 m A h g^(-1)after300 cycles under the current density of 200 m A g^(-1)at-10℃),compared with the negligible capacity for the pure Ti_(3)C_(2)T_(x) MXene(26 m A h g^(-1)at 200 m A g^(-1)).We characterized as-made T/F samples via the Xray photoelectron spectroscopy(XPS),Fourier transformed infrared(FT-IR)and Raman spectroscopy,and found that the terminated functional groups(-O and-OH)in T/F are Li^(+) storage sites.Fe^(3+)-stabilization makes-O/-OH groups in MXene interlayers become active towards Li^(+),leading to much more active sites and thus an enhanced capacity and well cyclic stability.In contrast,only-O/-OH groups on the top and bottom surfaces of pure Ti_(3)C_(2)T_(x) MXene can be used to adsorb Li^(+),resulting in a low capacity.Transmission electron microscopy(TEM)and XPS data confirm that T/F-4:1 holds the highly stable solid electrolyte interphase(SEI)layer during the cycling at-10℃.Density functional theory(DFT)calculations further uncover that T/F has fast diffusion of Li^(+) and consequent better electrochemical performances than pure Ti_(3)C_(2)T_(x) MXene.It is believed that the new strategy used here will help to fabricate advanced MXene-based electrode materials in the energy storage application.

关 键 词：Ti_(3)C_(2)T_(x)MXene Li-ion storage Low temperature Solid electrolyte interphase Density functional theory 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]