Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 7, Pages 6327-6335Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b17795
Keywords
3D Mo2C foam; binder-free; self-standing; Li-O-2 batteries; electrochemical mechanism
Funding
- Special Fund of Key Technology Research and Development Projects [20180201097GX, 20180201099GX, 20180201096GX]
- Jilin Province Science and Technology Department
- 13th Five-year plan Science and Technology Research of Jilin province
- China Postdoctoral Science Foundation [2016M601363]
- Fundamental Research Funds for the Central Universities [2412017QD011]
- Key Subject Construction of Physical Chemistry of Northeast Normal University
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The development of self-standing and binder-free O-2 electrodes is significant for enhancing the total specific energy density and suppressing parasitic reactions for Li-O-2 batteries, which is still a formidable challenge thus far. Here, a three-dimensional(foam-like composite composed of Mo2C nanorods decorated by different amounts of N-doped carbon (Mo2C-NR@xNC (x = 5, 11, and 16 wt %)) was directly employed as the O-2 electrode without applications of any binders and current collectors. Mo2C-NR@xNC presents a network microstructure with interconnected macropore and mesoporous channels, which is beneficial to achieving fast Li+ migration and O-2 diffusion, facilitating the electrolyte impregnation, and providing enough space for Li2O2 storage. Additionally, the coated N-doped carbon layer can largely improve the electrochemical stability and conductivity of Mo2C. The cell with Mo2C-NR@11NC shows a considerable cyclability of 200 cycles with an overpotential of 0.28 V in the first cycle at a constant current density of 100 mA g(-1), a superior reversibility associated with the formation and decomposition of Li2O2 as desired, and a high electrochemical stability. On the basis of the experimental results, the electrochemical mechanism for the cell using Mo2C-NR@11NC is proposed. These results represent a promising process in the development of a self-standing and binder-free foam-based electrode for Li-O-2 batteries.
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