期刊
NANO LETTERS
卷 14, 期 10, 页码 5677-5686出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5024029
关键词
Nanomat batteries; heterolayer; one-dimensional nanobuilding block; separator/electrode assembly; cellulose nanofibrils; single-walled carbon nanotubes
类别
资金
- Korea Forest Research Institute grant [FP 0400-2007-03]
- National Research Foundation of Korea Grant - Korean Government (MEST) [NRF-2009-C1AAA001-2009-0093307]
- Energy Efficiency and Resources R&D program under the Ministry of Knowledge Economy, Republic of Korea [20112010100150]
- BK21 Plus Program - Ministry of Education (MOE, Korea) [10Z20130011057]
- National Research Foundation of Korea (NRF)
The rapidly approaching smart/wearable energy era necessitates advanced rechargeable power sources with reliable electrochemical properties and versatile form factors. Here, as a unique and promising energy storage system to address this issue, we demonstrate a new class of heterolayered, one-dimensional (1D) nanobuilding block mat (h-nanomat) battery based on unitized separator/electrode assembly (SEA) architecture. The unitized SEAs consist of wood cellulose nanofibril (CNF) separator membranes and metallic current collector-/polymeric binder-free electrodes comprising solely single-walled carbon nanotube (SWNT)-netted electrode active materials (LiFePO4 (cathode) and Li(4)Ti(5)O12 (anode) powders are chosen as model systems to explore the proof of concept for h-nanomat batteries). The nanoporous CNF separator plays a critical role in securing the tightly interlocked electrode-separator interface. The SWNTs in the SEAs exhibit multifunctional roles as electron conductive additives, binders, current collectors and also non-Faradaic active materials. This structural/physicochemical uniqueness of the SEAs allows significant improvements in the mass loading of electrode active materials, electron transport pathways, electrolyte accessibility and misalignment-proof of separator/electrode interface. As a result, the h-nanomat batteries, which are easily fabricated by stacking anode SEA and cathode SEA, provide unprecedented advances in the electrochemical performance, shape flexibility and safety tolerance far beyond those achievable with conventional battery technologies. We anticipate that the h-nanomat batteries will open 1D nanobuilding block-driven new architectural design/opportunity for development of next-generation energy storage systems.
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