| 초록 |
Forthcoming flexible electronics with compelling shape diversity and mobile usability have garnered significant attention as a kind of disruptive technology to drastically change our daily lives. From a power source point of view, conventional rechargeable batteries (represented by lithium-ion batteries) with fixed shapes and dimensions have intrinsic limitations in fulfilling design/performance requirements for flexible electronics. Here, as a promising energy storage system to address this challenging issue, we present a new class of hetereolayered one-dimensional (1D) nanobuilding block mat paper batteries 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. CNFs are an eco-friendly, naturally-abundant mesoscopic material with an anisotropic dimension of micrometer length and nanometer diameter. 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 material/structural uniqueness enables significant improvement in the mass loading of electrode active materials, electron/ion transport 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 envision that the CNF-based battery strategy holds a great deal of promise as a reliable and scalable platform technology to open a new concept of cell architecture and fabrication route toward advanced power sources with exceptional flexibility/cell performance suitable for flexible electronics. |
