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- Title
PPy-Coated Mo 3 S 4 /CoMo 2 S 4 Nanotube-like Heterostructure for High-Performance Lithium Storage.
- Authors
Tang, Fei; Jiang, Wei; Xie, Jingjing; Zhao, Deyang; Meng, Yanfeng; Yang, Zhenglong; Lv, Zhiqiang; Xu, Yanbin; Sun, Wenjuan; Jiang, Ziqiao
- Abstract
Heterostructured materials show great potential to enhance the specific capacity, rate performance and cycling lifespan of lithium-ion batteries owing to their unique interfaces, robust architectures, and synergistic effects. Herein, a polypyrrole (PPy)-coated nanotube-like Mo3S4/CoMo2S4 heterostructure is prepared by the hydrothermal and subsequent in situ polymerization methods. The well-designed nanotube-like structure is beneficial to relieve the serious volume changes and facilitate the infiltration of electrolytes during the charge/discharge process. The Mo3S4/CoMo2S4 heterostructure could effectively enhance the electrical conductivity and Li+ transport kinetics owing to the refined energy band structure and the internal electric field at the heterostructure interface. Moreover, the conductive PPy-coated layer could inhibit the obvious volume expansion like a firm armor and further avoid the pulverization of the active material and aggregation of generated products. Benefiting from the synergistic effects of the well-designed heterostructure and PPy-coated nanotube-like architecture, the prepared Mo3S4/CoMo2S4 heterostructure delivers high reversible capacity (1251.3 mAh g−1 at 300 mA g−1), superior rate performance (340.3 mAh g−1 at 5.0 A g−1) and excellent cycling lifespan (744.1 mAh g−1 after 600 cycles at a current density of 2.0 A g−1). Such a design concept provides a promising strategy towards heterostructure materials to enhance their lithium storage performances and boost their practical applications.
- Subjects
HETEROJUNCTIONS; ELECTRIC conductivity; LITHIUM; GRAPHITIZATION; ENERGY bands
- Publication
Molecules, 2024, Vol 29, Issue 1, p234
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules29010234