Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 37, Pages 15519-15526Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta02604g
Keywords
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Funding
- National Key Basic Research Development Program [2010CB631001, 2014CB643305]
- National Natural Science Foundation of China [51201069]
- Chinese Ministry of Education [313026]
- Program for New Century Excellent Talents in University [NCET-10-0437]
- Research Fund for the Doctoral Program of Higher Education of China [20120061120042]
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Nanostructured SnO2 is an attractive anode material for high-energy-density lithium-ion batteries because of the fourfold higher theoretical charge capacity than commercially used graphite. However, the poor capacity retention at high rates and long-term cycling have intrinsically limited applications of nanostructured SnO2 anodes due to large polarization and similar to 300% volume change upon lithium insertion/extraction. Here we report the design of a SnO2-based anode, which is constructed by embedding SnO2 nanoparticles into a seamlessly integrated 3D nanoporous/solid copper current collector (S/NP Cu/SnO2), with an aim at tackling both problems for the high-performance reversible lithium storage. As a result of the unique hybrid architecture that enhances electron transfer and rapid access of the lithium ion into the particle bulk, the S/NP Cu/SnO2 anode can store charge with a capacity density as high as similar to 3695 mA h cm(-3) and an exceptional rate capability. Even when the discharge rate is increased by a factor of 160 (12 A g(-1)), it still retains similar to 1178 mA h cm(-3), one order of magnitude higher than that of a traditional SnO2-based electrode (similar to 111.6 mA h cm(-3)), which is assembled by mixing SnO2 nanoparticles with conductive carbon black and a polymeric binder and coating on flat Cu foil. In addition, not only do the rigid Cu skeleton and the stable Cu/SnO2 interface improve the microstructural stability, but also the pore channels accommodate the large SnO2 volume changes, enlisting the S/NP Cu/SnO2 anode to exhibit high specific capacity over 1000 cycles at a high rate.
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