Journal
CHEMICAL ENGINEERING JOURNAL
Volume 345, Issue -, Pages 320-326Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.03.166
Keywords
Exfoliated MoS2 nanosheets; TiO2; Interface-reinforcement; High stability; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [21522602, 51672082, 91534202]
- Shanghai Rising-Star Program [15QA1401200]
- Innovation Program of Shanghai Municipal Education Commission
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Fundamental Research Funds for the Central Universities [222201718002]
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The highly structural integrity of electrode materials before and after cycles has been widely recognized as the pivotal for achieving stable lithium-ion batteries. Herein, an interface-reinforcement strategy has been developed to enhance the structural stability of two-dimensional (2D) nanomaterials. The TiO2/MoS2 hybrids are synthesized by anchoring ultrafine TiO2 nanoparticles on few-layered MoS2 nanosheets using a facile and scalable method. Such a fascinating 0D/2D heterostructure can effectively overcome the shortcoming of MoS2 nanosheets easy-stacking, promoting the electrolyte accessability to 2D interlayer space. Impressively, the robust Ti-O-S covalent interaction between them can greatly consolidate the 2D nanosheets, alleviating the structural stress change caused by lithiation/delithiation. Consequently, the as-obtained TiO2/MoS2 hybrids exhibit a remarkably improved specific capacity compared to the exfoliated MoS2 nanosheets at various rates. A stable specific capacity of 410 mAh g(-1) is still maintained even through over 500 cycles at 1.0 A g(-1). The interface-reinforcement concept can also be extended to other 2D nanomaterials, showing huge application potential for stable LIBs.
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