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Electrostatically Assembling 2D Nanosheets of MXene and MOF‐Derivatives into 3D Hollow Frameworks for Enhanced Lithium Storage
Author(s) -
Zhao Xi,
Xu Hai,
Hui Zengyu,
Sun Yue,
Yu Chenyang,
Xue Jialu,
Zhou Ruicong,
Wang Lumin,
Dai Henghan,
Zhao Yue,
Yang Jian,
Zhou Jinyuan,
Chen Qiang,
Sun Gengzhi,
Huang Wei
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201904255
Subject(s) - materials science , anode , mxenes , chemical engineering , electrochemistry , nanotechnology , lithium (medication) , energy storage , electrode , chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
As an essential member of 2D materials, MXene (e.g., Ti 3 C 2 T x ) is highly preferred for energy storage owing to a high surface‐to‐volume ratio, shortened ion diffusion pathway, superior electronic conductivity, and neglectable volume change, which are beneficial for electrochemical kinetics. However, the low theoretical capacitance and restacking issues of MXene severely limit its practical application in lithium‐ion batteries (LIBs). Herein, a facile and controllable method is developed to engineer 2D nanosheets of negatively charged MXene and positively charged layered double hydroxides derived from ZIF‐67 polyhedrons into 3D hollow frameworks via electrostatic self‐assembling. After thermal annealing, transition metal oxides (TMOs)@MXene (CoO/Co 2 Mo 3 O 8 @MXene) hollow frameworks are obtained and used as anode materials for LIBs. CoO/Co 2 Mo 3 O 8 nanosheets prevent MXene from aggregation and contribute remarkable lithium storage capacity, while MXene nanosheets provide a 3D conductive network and mechanical robustness to facilitate rapid charge transfer at the interface, and accommodate the volume expansion of the internal CoO/Co 2 Mo 3 O 8 . Such hollow frameworks present a high reversible capacity of 947.4 mAh g −1 at 0.1 A g −1 , an impressive rate behavior with 435.8 mAh g −1 retained at 5 A g −1 , and good stability over 1200 cycles (545 mAh g −1 at 2 A g −1 ).