Journal
ELECTROCHIMICA ACTA
Volume 283, Issue -, Pages 619-627Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.07.011
Keywords
Lithium ion batteries; 3D aerogel; Free-standing; MoO2@MoS2; S-doped graphene
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Funding
- National Key R&D Program of China [2018YFB0905400]
- National Science Foundation of China [51772169, 51572151, 51672158, 51402168]
- Outstanding Youth Science and Technology Innovation Team Project of Hubei Educational Committee [T201603]
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MoO2 with low electrical resistivity and high specific capacity as anode for lithium ion batteries is hindered because of its large volume variation during Li+ insertion/extraction process, which leads to fast capacity fading. Herein, three-dimensional (3D) core-shell MoO2@few-layered MoS2 covered by S-doped graphene (MO/MS/SG) aerogel has been fabricated through hydrothermal reaction and freeze-drying process together with sulfidation. MoO2 nanoparticles coated by few-layer MoS2 can promote good dispersion of MoO2 nanoparticles and avoid the restacking of MoS2. S doping in graphene can increase the defects and active sites. S-doped graphene aerogel as flexible framework and conductive network not only provides the transmission path for ions and electrons, but also maintains the structural integrity of electrode during cycles. Core-shell MoO2@few-layer MoS2 hybrid well-dispersed in S-doped graphene matrix buffers the volume changes during cycles and contributes to high reversible capacity. Free-standing electrode without binder and current collector prevents the separation of electrode materials from current collector during cycles. Benefitting from the unique structures, the MO/MS/SG aerogel as anode for lithium ion battery exhibits high reversible capacities of 683 mAh g(-1) at 0.1 Ag-1 after 100 cycles and 533 mAh g(-1) at 0.5 Ag-1 after 350 cycles together with excellent rate capability. This work demonstrates the potential application of the Mo-based materials in lithium ion batteries. (C) 2018 Elsevier Ltd. All rights reserved.
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