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  • Title: Biocompatible ionic liquid-biopolymer electrolyte-enabled thin and compact magnesium-air batteries.
    Author: Jia X, Yang Y, Wang C, Zhao C, Vijayaraghavan R, MacFarlane DR, Forsyth M, Wallace GG.
    Journal: ACS Appl Mater Interfaces; 2014 Dec 10; 6(23):21110-7. PubMed ID: 25380306.
    Abstract:
    With the surge of interest in miniaturized implanted medical devices (IMDs), implantable power sources with small dimensions and biocompatibility are in high demand. Implanted battery/supercapacitor devices are commonly packaged within a case that occupies a large volume, making miniaturization difficult. In this study, we demonstrate a polymer electrolyte-enabled biocompatible magnesium-air battery device with a total thickness of approximately 300 μm. It consists of a biocompatible polypyrrole-para(toluene sulfonic acid) cathode and a bioresorbable magnesium alloy anode. The biocompatible electrolyte used is made of choline nitrate (ionic liquid) embedded in a biopolymer, chitosan. This polymer electrolyte is mechanically robust and offers a high ionic conductivity of 8.9 × 10(-3) S cm(-1). The assembled battery delivers a maximum volumetric power density of 3.9 W L(-1), which is sufficient to drive some types of IMDs, such as cardiac pacemakers or biomonitoring systems. This miniaturized, biocompatible magnesium-air battery may pave the way to a future generation of implantable power sources.
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