J. Mater. Sci. Technol. ›› 2021, Vol. 67: 156-164.DOI: 10.1016/j.jmst.2020.06.037

• Research article • Previous Articles     Next Articles

Fe 3+-stabilized Ti3C2Tx MXene enables ultrastable Li-ion storage at low temperature

Nana Zhaoa, Fengchu Zhangb,1, Fei Zhanc, Ding Yib,*(), Yijun Yangb,*(), Weibin Cuia,*(), Xi Wangb   

  1. a 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
    b Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing Jiaotong University, Beijing 100044, China
    c Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China
  • Received:2020-05-22 Revised:2020-06-04 Accepted:2020-06-06 Published:2021-03-20 Online:2021-04-15
  • Contact: Ding Yi,Yijun Yang,Weibin Cui
  • About author:cuiweibin@epm.neu.edu.cn (W. Cui).
    yjyang@bjtu.edu.cn (Y. Yang),
    * E-mail addresses: yiding@bjtu.edu.cn (D. Yi),
    First author contact:

    1These authors contributed equally to this work.

Abstract:

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 Ti3C2Tx MXene (donated as T/F-4:1) as the anode material, which exhibits an ultrastable low-temperature Li-ion storage property (135.2 mA h g -1 after 300 cycles under the current density of 200 mA g -1 at -10 °C), compared with the negligible capacity for the pure Ti3C2Tx MXene (~26 mA h g -1 at 200 mA g -1). We characterized as-made T/F samples via the X-ray 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 Ti3C2Tx 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 °C. Density functional theory (DFT) calculations further uncover that T/F has fast diffusion of Li + and consequent better electrochemical performances than pure Ti3C2Tx MXene. It is believed that the new strategy used here will help to fabricate advanced MXene-based electrode materials in the energy storage application.

Key words: Ti3C2Tx MXene, Li-ion storage, Low temperature, Solid electrolyte interphase, Density functional theory