Direct write dispenser printing of a zinc microbattery with an ionic liquid gel electrolyte

• Published in: Journal of micromechanics and microengineering 2010-10, Vol.20 (10), p.104009-104009
• Main Authors: Ho, C C, Evans, J W, Wright, P K
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Diffusion and ionic conduction in liquids; Dispensers; Electrolytes; Electrolytic cells; Energy density; Exact sciences and technology; Ionic conduction; Ionic liquids; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Microorganisms; Physics; Printing; Transport properties of condensed matter (nonelectronic); Zinc
• ISSN: 0960-1317; 1361-6439
• DOI: 10.1088/0960-1317/20/10/104009

The need for energy dense microbatteries with miniature dimensions has prompted the development of unconventional materials, cell geometries, and processing methods. This work will highlight our materials investigations, deposition methods and the device performance of a printed zinc--manganese dioxide rechargeable microbattery utilizing an ionic liquid gel electrolyte. We have developed a direct write dispenser printing method with the ability to fabricate multilayer structures and precisely deposit and pattern these components onto any substrates. The use of a unique room-temperature ionic liquid swelled into a polymer to form a gel electrolyte with solid-like mechanical strength and liquid-like ion transport properties has enabled the simple fabrication of stacked microbattery structures with the potential to be easily integrated directly onto a microdevice substrate. Initial microbattery tests and cycle behavior are discussed, and after an initial activation of the cathode material, an experimental cell discharge capacity and energy density of 0.98 mA h cm-2 and 1.2 mW h cm-2 were measured, respectively.