Biocompatible ionic liquid-biopolymer electrolyte-enabled thin and compact magnesium-air batteries.
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.
Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, University of Wollongong , Wollongong 2522, Australia.
Xiaoteng
X
Jia
Yang
Y
Yang
Caiyun
C
Wang
Chen
C
Zhao
R
R
Vijayaraghavan
Douglas R
DR
MacFarlane
Maria
M
Forsyth
Gordon G
GG
Wallace
D001672:Biocompatible Materials / Q000737:chemistry*; D001704:Biopolymers; D011211:Electric Power Supplies; D004573:Electrolytes / Q000737:chemistry; D006801:Humans; D052578:Ionic Liquids / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D019736:Prostheses and Implants
D001672:Biocompatible Materials; D001704:Biopolymers; D004573:Electrolytes; D052578:Ionic Liquids; D008274:Magnesium
Mg−air batteries; biocompatible ionic liquid; chitosan; integrated solid-state batteries; polypyrrole