| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | New Perspectives on Battery Design and Architecture |
| 초록 | Forthcoming wearable/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 are generally fabricated by winding (or stacking) cell components (such as anodes, cathodes and separator membranes) and then packaging them with (cylindrical-/rectangular-shaped) metallic canisters or pouch films, finally followed by injection of liquid electrolytes. In particular, the use of liquid electrolytes gives rise to serious concerns in cell assembly, because they require strict packaging materials to avoid leakage problems and also separator membranes to prevent electrical contact between electrodes. For these reasons, the conventional cell assembly and materials have pushed the batteries to lack of variety in form factors, thus imposing formidable challenges on their integration into versatile-shaped electronic devices. Here, as a facile and efficient strategy to address the aforementioned longstanding challenge, we demonstrate a new class of printed solid-state Li-ion batteries and also all-inkjet-printed solid-state supercapacitors with exceptional shape conformability and aesthetic versatility which lie far beyond those achievable with conventional battery technologies. The fully-integrated, multilayer-structured printed solid-state lithium-ion batteries with various form factors were fabricated as follows. Through simple stencil printing process (followed by ultraviolet (UV) crosslinking), solid-state composite electrolyte (SCE) layer and SCE matrix-embedded electrodes were consecutively printed on arbitrary objects of complex geometries. Tuning rheological properties of SCE paste and electrode slurry toward thixotropic fluid characteristics, along with well-tailored core elements including UV-cured triacrylate polymer and high boiling point electrolyte, is a key-enabling technology for the realization of PRISS batteries. This process/material uniqueness allowed us to remove extra processing steps (related to solvent drying and liquid-electrolyte injection) and also conventional microporous separator membranes, thereupon enabling the seamless integration of shape-conformable PRISS batteries (including letters-shaped ones) into complex-shaped objects. The all-inkjet-printed, solid-state flexible supercapacitors (SCs) were fabricated directly on conventional A4 paper using a commercial desktop inkjet printer. A salient feature of the inkjet-printed power sources is their monolithic integration with paper, i.e., they look like inkjet-printed letters or figures that are commonly found in office documents. The SC was composed of activated carbon/carbon nanotubes (CNTs) and ionic liquid/ultraviolet-cured triacrylate polymer-based solid-state electrolyte. Cellulose nanofibril-mediated nanoporous mats were inkjet-printed on top of paper as a primer layer to enable high-resolution images. The inkjet-printed SCs were easily connected in series or parallel, leading to user-customized control of cell voltage and capacitance. Notably, a variety of all-inkjet-printed SCs featuring computer-designed artistic patterns/letters were aesthetically unitized with other inkjet-printed images and smart glass cups, underscoring their potential applicability as an unprecedented object-tailored power source. |
| 저자 | 이상영 |
| 소속 | UNIST |
| 키워드 | battery; design; architecture; flexible; printing |
