Journal
ADVANCED ENERGY MATERIALS
Volume 7, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201701099
Keywords
heteronanomat skeletons; lithium-ion batteries; mechanical flexibility; polymeric nanofiber/carbon nanotube; ultrahigh energy density
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning [2015R1A2A1A01003474]
- Wearable Platform Materials Technology Center through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning [2016R1A5A1009926]
- Batteries RD of LG Chem.
- Korea Forest Research Institute [FP 0400-2016-01]
- Development Program of the Korea Institute of Energy Research (KIER) [B7-2421-04]
- National Institute of Forest Science (NIFOS), Republic of South Korea [FP0400-2016-01, FP0400-2016-01-2017] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016R1A5A1009926] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The ongoing surge in demand for high-energy/flexible rechargeable batteries relentlessly drives technological innovations in cell architecture as well as electrochemically active materials. Here, a new class of all-nanomat lithiumion batteries (LIBs) based on 1D building element-interweaved heteronanomat skeletons is demonstrated. Among various electrode materials, silicon (Si, for anode) and overlithiated layered oxide (OLO, for cathode) materials are chosen as model systems to explore feasibility of this new cell architecture and achieve unprecedented cell capacity. Nanomat electrodes, which are completely different from conventional slurry-cast electrodes, are fabricated through concurrent electrospinning (for polymeric nanofibers) and electrospraying (for electrode materials/carbon nanotubes (CNTs)). Si (or rambutan-shaped OLO/ CNT composite) powders are compactly embedded in the spatially interweaved polymeric nanofiber/CNT heteromat skeletons that play a crucial role in constructing 3D-bicontinuous ion/electron transport pathways and allow for removal of metallic foil current collectors. The nanomat Si anodes and nanomat OLO cathodes are assembled with nanomat Al2O3 separators, leading to the fabrication of all-nanomat LIB full cells. Driven by the aforementioned structural/chemical uniqueness, the all-nanomat full cell shows exceptional improvement in electrochemical performance (notably, cell-based gravimetric energy density = 479 W h kgCell(-1)) and also mechanical deformability, which lie far beyond those achievable with conventional LIB technologies.
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