能源化学(英文版)

能源化学(英文版) ›› 2019, Vol. 38 ›› Issue (11): 50-54.DOI: 10.1016/j.jechem.2018.12.020

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Employing MXene as a matrix for loading amorphous Si generated upon lithiation towards enhanced lithium-ion storage

Haojie Lia,b, Ming Lub,c,d, Wenjuan Hanb,e, Haibo Lid, Yucheng Wua, Wei Zhangc, Jiaheng Wanga, Bingsen Zhangb   

  1. a Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;
    b Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China;
    c School of Materials Science & Engineering, and Electron Microscopy Center, Jilin University, Changchun 130012, Jilin, China;
    d Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, Jilin, China;
    e Key Laboratory of UV-Emitting Materials and Technology of the Ministry of Education, Northeast Normal University, Changchun 130024, Jilin, China
  • 收稿日期:2018-10-23 修回日期:2018-12-04 出版日期:2019-11-15 发布日期:2020-12-18
  • 通讯作者: Wei Zhang, weizhang@jlu.edu.cn; Jiaheng Wang, jhwang@hfut.edu.cn
  • 基金资助:
    We gratefully acknowledge the financial support provided by the Joint Foundation of Liaoning Province National Science Foundation and Shenyang National Laboratory for Materials Science (Grant No. 20180510047), the National Natural Science Foundation of China (Grant Nos. 91545119, 21761132025, 21773269 and 51872115), the Youth Innovation Promotion Association CAS (Grant No. 2015152), the Program for JLU Science and Technology Innovative Research Team (JLUSTIRT, 2017TD-09), and “Double-First Class” Discipline for Materials Science & Engineering. Natural Science Foundation of Anhui Province (1608085ME93), the Fundamental Research Funds for the Central Universities (JZ2018YYPY0305), and the 111 Project “New Materials and Technology for Clean Energy” (B18018).

Employing MXene as a matrix for loading amorphous Si generated upon lithiation towards enhanced lithium-ion storage

Haojie Lia,b, Ming Lub,c,d, Wenjuan Hanb,e, Haibo Lid, Yucheng Wua, Wei Zhangc, Jiaheng Wanga, Bingsen Zhangb   

  1. a Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;
    b Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China;
    c School of Materials Science & Engineering, and Electron Microscopy Center, Jilin University, Changchun 130012, Jilin, China;
    d Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, Jilin, China;
    e Key Laboratory of UV-Emitting Materials and Technology of the Ministry of Education, Northeast Normal University, Changchun 130024, Jilin, China
  • Received:2018-10-23 Revised:2018-12-04 Online:2019-11-15 Published:2020-12-18
  • Contact: Wei Zhang, weizhang@jlu.edu.cn; Jiaheng Wang, jhwang@hfut.edu.cn
  • Supported by:
    We gratefully acknowledge the financial support provided by the Joint Foundation of Liaoning Province National Science Foundation and Shenyang National Laboratory for Materials Science (Grant No. 20180510047), the National Natural Science Foundation of China (Grant Nos. 91545119, 21761132025, 21773269 and 51872115), the Youth Innovation Promotion Association CAS (Grant No. 2015152), the Program for JLU Science and Technology Innovative Research Team (JLUSTIRT, 2017TD-09), and “Double-First Class” Discipline for Materials Science & Engineering. Natural Science Foundation of Anhui Province (1608085ME93), the Fundamental Research Funds for the Central Universities (JZ2018YYPY0305), and the 111 Project “New Materials and Technology for Clean Energy” (B18018).

摘要： Although Si-based nanomaterials provide incomparable lithium ion storage ability in theory, it suffers from low initial Coulombic efficiency, electrical disconnection, and fracture due to huge volume changes after extended cycles. As a result, it leads to a severe capacity fading and an increase in internal impedance. Herein, Ti-elemental MXene was employed as a matrix for the intermediate product of Si electrodes. The boundary between the inner core of pristine Si and its outer shell of amorphous LixSi alloy was reconstructed. Smaller amorphous aggregates were observed in the MXene&Si hybrid electrode after 500 cycles by using transmission electron microscopy. Consequently, an enhanced specific capacity was achieved as MXene as a matrix enables loading amorphous Si.

关键词: Silicon, Ti3C2, MXene, Li-ion

Abstract: Although Si-based nanomaterials provide incomparable lithium ion storage ability in theory, it suffers from low initial Coulombic efficiency, electrical disconnection, and fracture due to huge volume changes after extended cycles. As a result, it leads to a severe capacity fading and an increase in internal impedance. Herein, Ti-elemental MXene was employed as a matrix for the intermediate product of Si electrodes. The boundary between the inner core of pristine Si and its outer shell of amorphous LixSi alloy was reconstructed. Smaller amorphous aggregates were observed in the MXene&Si hybrid electrode after 500 cycles by using transmission electron microscopy. Consequently, an enhanced specific capacity was achieved as MXene as a matrix enables loading amorphous Si.

Key words: Silicon, Ti3C2, MXene, Li-ion