Lee Kwon-Hyung, Lee Seong-Sun, Ahn David B, Lee Jaehyun, Byun Doyoung, Lee Sang-Young
Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea.
Department of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea.
Sci Adv. 2020 Mar 6;6(10):eaaz1692. doi: 10.1126/sciadv.aaz1692. eCollection 2020 Mar.
Microsupercapacitors (MSCs) have garnered considerable attention as a promising power source for microelectronics and miniaturized portable/wearable devices. However, their practical application has been hindered by the manufacturing complexity and dimensional limits. Here, we develop a new class of ultrahigh areal number density solid-state MSCs (UHD SS-MSCs) on a chip via electrohydrodynamic (EHD) jet printing. This is, to the best of our knowledge, the first study to exploit EHD jet printing in the MSCs. The activated carbon-based electrode inks are EHD jet-printed, creating interdigitated electrodes with fine feature sizes. Subsequently, a drying-free, ultraviolet-cured solid-state gel electrolyte is introduced to ensure electrochemical isolation between the SS-MSCs, enabling dense SS-MSC integration with on-demand (in-series/in-parallel) cell connection on a chip. The resulting on-chip UHD SS-MSCs exhibit exceptional areal number density [36 unit cells integrated on a chip (area = 8.0 mm × 8.2 mm), 54.9 cells cm] and areal operating voltage (65.9 V cm).
微型超级电容器（MSCs）作为微电子和小型化便携式/可穿戴设备的一种有前途的电源，已引起了广泛关注。然而，其实际应用受到制造复杂性和尺寸限制的阻碍。在此，我们通过电液动力学（EHD）喷射印刷在芯片上开发了一类新型的超高面数密度固态微型超级电容器（UHD SS-MSCs）。据我们所知，这是首次在微型超级电容器中利用EHD喷射印刷的研究。基于活性炭的电极油墨通过EHD喷射印刷，形成具有精细特征尺寸的叉指式电极。随后，引入一种无需干燥的紫外线固化固态凝胶电解质，以确保固态微型超级电容器之间的电化学隔离，从而实现密集的固态微型超级电容器在芯片上按需（串联/并联）电池连接的集成。由此产生的芯片上UHD SS-MSCs表现出优异的面数密度[在一个芯片（面积 = 8.0 mm × 8.2 mm）上集成36个单元电池，54.9个电池/cm²]和面工作电压（65.9 V/cm）。
