Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201701203
Keywords
breathable; hierarchically porous; lithium-oxygen batteries; wood-based cathode
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Funding
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DESC0001160]
- China Scholarship Council (CSC)
- National Key R&D Program of China [2017YFB0102900]
- National Natural Science Foundation of China (NSFC) [21776105]
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In this work, a hierarchically porous and ultrathick ''breathable'' wood-based cathode for high-performance Li-O-2 batteries is developed. The 3D carbon matrix obtained from the carbonized and activated wood (denoted as CA-wood) serves as a superconductive current collector and an ideal porous host for accommodating catalysts. The ruthenium (Ru) nanoparticles are uniformly anchored on the porous wall of the aligned microchannels (denoted as CA-wood/Ru). The aligned open microchannels inside the carbon matrix contribute to unimpeded oxygen gas diffusion. Moreover, the hierarchical pores on the microchannel walls can be facilely impregnated by electrolyte, forming a continuous supply of electrolyte. As a result, numerous ideal triphase active sites are formed where electrolyte, oxygen, and catalyst accumulate on the porous walls of microchannels. Benefiting from the numerous well-balanced triple-phase active sites, the assembled Li-O-2 battery with the CA-wood/Ru cathode (thickness: approximate to 700 mu m) shows a high specific area capacity of 8.58 mA h cm(-2) at 0.1 mA cm(-2). Moreover, the areal capacity can be further increased to 56.0 mA h cm(-2) by using an ultrathick CA-wood/Ru cathode with a thickness of approximate to 3.4 mm. The facile ultrathick wood-based cathodes can be applied to other cathodes to achieve a super high areal capacity without sacrificing the electrochemical performance.
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