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A Flexible Si@C Electrode with Excellent Stability Employing an MXene as a Multifunctional Binder for Lithium‐Ion Batteries
Author(s) -
Zhang Peng,
Zhu Qizhen,
Guan Zhaoruxin,
Zhao Qian,
Sun Ning,
Xu Bin
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201901497
Subject(s) - materials science , anode , lithium (medication) , electrode , nanocomposite , conductivity , chemical engineering , porosity , nanoparticle , electrical conductor , silicon , composite material , nanotechnology , optoelectronics , chemistry , medicine , engineering , endocrinology
Silicon is a promising anode material with high capacity for lithium‐ion batteries (LIBs) but suffers from poor conductivity and large volume change during charge/discharge. Herein, by using two‐dimensional conductive MXene as a multifunctional binder instead of conventional insulating polymer binders such as poly(vinylidene fluoride) or carboxymethylcellulose sodium (PVDF and CMC, respectively), a free‐standing, flexible Si@C film was fabricated by simple vacuum filtration and directly used as anode for LIBs. In the MXene‐bonded Si@C film, MXene constructed a three‐dimensional conductive framework in which Si@C nanocomposites were embedded. Its loose and porous structure provided much space to buffer the large volume expansion of Si@C nanoparticles and thus led to significantly superior cycle stability compared with conventional CMC‐ and PVDF‐bonded Si@C electrodes. Moreover, the porous structure and the metallically conductive MXene offered fast ion transport and outstanding conductivity of the MXene‐bonded Si@C film, which were favorable for its rate performance. These results promise good potential of the MXene‐bonded Si@C film electrode for LIBs.