Improved design of highly efficient microsized lithium-ion batteries for stretchable electronics

Abstract

We introduce a stretchable microsized Li-ion battery with a novel design. The battery fabricated using a facile technique exhibited high performance. A dry-etching process was utilized to pattern lithium phosphorus oxynitride for avoiding the use of a photoresist developer (photolithography), which can damage the amorphous lithium manganese oxide (LiMn2O4 (LMO)) cathode. This allowed us to fabricate the current collectors and electrodes away from the main body of the microsized battery (a parallel structure rather than a stacked, i.e., perpendicular, structure). An enhanced capacity of ~150 mAh/g was achieved using the parallel device structure at a charge-discharge average potential of 3.7 V; in comparison, the performance of a device with a stacked structure was significantly inferior. The microsized batteries were utilized to illuminate a white inorganic light-emitting diode with a turn-on voltage of ~2.5 V.The fabricated devices with the stacked structure were transferred to a mechanically prestrained (~22.5%) polydimethylsiloxane polymer via a kinetic transfer process. Upon removal of the prestrain, the shrinkage of the substrate caused buckle formation at the interconnects, and

Highly stretchable and rehealable wearable strain sensor based on dynamic covalent thermoset and liquid metal

“…The comparison of the strain sensitivity or gauge factor (GF) between pure LM sensor and SiO 2 doped LM sensor is exhibited in figure S4, and the GF of the doped LM one has increased by an order of magnitude. It is worth pointing that such sensitivity is a high GF in liquid based (LM, ionic glycol and link) strain sensors [30,[55][56][57]. The fabrication process of the polyimine-LM strain sensor is schematically illustrated in figure 1(b).…”