Sollami Delekta Szymon, Adolfsson Karin H, Benyahia Erdal Nejla, Hakkarainen Minna, Östling Mikael, Li Jiantong
KTH Royal Institute of Technology, School of Electrical Engineering and Computer Science, Division of Electronics, Electrum 229, SE-164 40 Kista, Sweden.
Nanoscale. 2019 May 30;11(21):10172-10177. doi: 10.1039/c9nr01427f.
The advance of miniaturized and low-power electronics has a striking impact on the development of energy storage devices with constantly tougher constraints in terms of form factor and performance. Microsupercapacitors (MSCs) are considered a potential solution to this problem, thanks to their compact device structure. Great efforts have been made to maximize their performance with new materials like graphene and to minimize their production cost with scalable fabrication processes. In this regard, we developed a full inkjet printing process for the production of all-graphene microsupercapacitors with electrodes based on electrochemically exfoliated graphene and an ultrathin solid-state electrolyte based on nano-graphene oxide. The devices exploit the high ionic conductivity of nano-graphene oxide coupled with the high electrical conductivity of graphene films, yielding areal capacitances of up to 313 μF cm-2 at 5 mV s-1 and high power densities of up to ∼4 mW cm-3 with an overall device thickness of only ∼1 μm.
小型化和低功耗电子产品的发展对储能设备的发展产生了显著影响，在外形尺寸和性能方面的限制也越来越严格。微型超级电容器（MSCs）因其紧凑的器件结构被认为是解决这一问题的潜在方案。人们已经做出了巨大努力，通过使用石墨烯等新材料来最大化其性能，并通过可扩展的制造工艺来最小化其生产成本。在这方面，我们开发了一种全喷墨印刷工艺，用于生产全石墨烯微型超级电容器，其电极基于电化学剥离的石墨烯，超薄固态电解质基于纳米氧化石墨烯。这些器件利用了纳米氧化石墨烯的高离子电导率以及石墨烯薄膜的高电导率，在5 mV s-1 时面积电容高达313 μF cm-2 ，功率密度高达约4 mW cm-3 ，而整个器件厚度仅约1 μm。
