期刊
NANO RESEARCH
卷 14, 期 4, 页码 1218-1227出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-3221-y
关键词
Fe ions intercalation; few-layered MXene; pillared MXene; lithium-ion batteries
类别
资金
- Tai hu Electric Corporation [0001]
- National Natural Science Foundation of China [51901206]
The paper presents a method to enhance the rate performance and structural stability of Ti3C2Tx MXene by fabricating Fe nanocomplex pillared few-layered Ti3C2Tx (FPTC) heterostructures. The few-layered Ti3C2 MXene prepared using NH4+ ions method serves as a conductive substrate for rapid transport of Li+ ions and electrons, resulting in improved charge transfer kinetics and excellent rate performance of FPTC composites.
Pillaring technologies have been considered as an effective way to improve lithium storage performance of Ti3C2Tx MXene. Nevertheless, the pillared hybrids suffer from sluggish Li+ diffusion kinetics and electronic transportation due to the compact multi-layered MXene structure, thus exhibiting inferior rate performance. Herein, the few-layered Ti3C2 MXene (f-Ti3C2 MXene) which is free from restacking can be prepared quickly based on the NH4+ ions method. Besides, Fe nanocomplex pillared few-layered Ti3C2Tx (FPTC) heterostructures are fabricated via the intercalation of Fe ions into the interlayer of f-Ti3C2 MXene. The f-Ti3C2 MXene which is immune to restacking can provide a highly conductive substrate for the rapid transport of Li+ ions and electrons and possess adequate electrolyte accessible area. Moreover, f-Ti3C2 MXene can efficiently relieve the aggregation, prevent the pulverization and buffer the large volume change of Fe nanocomplex during lithiation/delithiation process, leading to enhanced charge transfer kinetics and excellent structural stability of FPTC composites. Consequently, the FPTC hybrids exhibit a high capacity of 535 mAh.g(-1) after 150 cycles at 0.5 A.g(-1) and an enhanced rate performance with 310 mAh.g(-1) after 850 cycles at 5 A.g(-1). This strategy is facile, universal and can be extended to fabricate various few-layered MXene-derived hybrids with superior rate capability.
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