3D printable ink for double-electrical-layer-enhanced electrode of microsupercapaitors

• Published in: Journal of power sources 2021-11, Vol.512, p.230468, Article 230468
• Main Authors: Wang, Yaling, Wang, Guolong, Cao, Chuyue, Zhang, Yan, Tang, Cheng, Liu, Heguang, Shen, Jianfeng, Li, Lei
• Format: Article
• Language: English
• Subjects: 3D printable pseudocapacitive materials ink; Areal energy density; Double-electrical-layer-enhanced structure; Microsupercapacitors; Rheological behaviors
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2021.230468

The key of the development of interdigital microsupercapacitors (MSCs) is to increase their areal energy density. 3D printing technology can build the pseudocapacitive electrodes companying with increasing the load capacity of pseudocapacitive materials in electrodes, resulting in the great increase of the areal energy density of MSCs. However, its major challenge is to design high electrical conductive pseudocapacitive materials and the related 3D printable inks. Here, a double-electrical-layer-enhanced structure of pseudocapacitive materials for electrodes is designed and its 3D printable ink is proposed and prepared in a simple method. The ink is used directly to 3D print the MSCs electrodes with double-electrical-layer-enhanced structure of pseudocapacitive materials simultaneously. The structure enhanced electrical conductivity of pseudocapacitive electrodes and their high load capacity boom the electrochemical performance of MSCs, especially the areal energy density. The method developed here is a good reference for research communities in this field. [Display omitted] •A double-electrical-layer-enhanced structure of electrode material is designed.•A 3D printable ink is proposed to print the design-structured electrode.•The designed structure of electrode enhances its electrical conductivity.•The electrode has good charge storage due to its structure and high load capacity.