Advanced Fiber-Shaped Aqueous Zn Ion Battery Integrated with Strain Sensor

Abstract

Multifunctional batteries have attracted increasing attention, offering additional functionalities beyond the conventional batteries. Herein, we report a fiber-shaped Zn ion battery that not only acts as a high-performance power supply but also provides a sensing function to monitor human motions. Titanium fiber coated with α-MnO 2 nanoflowers is exploited as the cathode for the fiber-shaped Zn ion battery, taking full advantage of such unique three-dimensional nanoflower structures of α-MnO 2 with a large electrochemically active surface area and fast electrochemical reaction kinetics. Thus, the obtained fiber-shaped Zn ion battery shows a high capacity of 280 mAh g −1 at 0.1 A g −1 , resulting in a notable energy density of 396 Wh kg −1 , good stability (capacity retention of 80.6% after 300 cycles), and high flexibility. As a demonstration, an electronic watch and five LEDs are successfully driven by two fiber-shaped Zn ion batteries. Furthermore, the fiber-shaped Zn ion battery is integrated with a strain sensor based on a carbon nanotube/polydimethylsiloxane film, offering good sensitivity to monitor motions of different body parts, such as the wrist, finger, elbow, and knee. This work provides insights into multifunctional battery applications for next-generation wearable electronics.

Flexible Quasi‐Solid‐State Aqueous Zinc‐Ion Batteries: Design Principles, Functionalization Strategies, and Applications

“…Reproduced with permission. [ 147 ] Copyright 2022, American Chemical Society. f) Illustration of wireless textile body area network powered by FQAZIB consisting of interconnected wearable sensors on clothing.…”

“…Very recently, Wei group reported a fibrous integrated system composed of a fibrous FQAZIB and a fibrous strain sensor based on a CNT/PDMS film (Figure 12e). [ 147 ] This all‐in‐one device not only possessed the feature of providing energy, but also delivered a sensing feature to monitor human motions including the elbow, finger, wrist, and knee. As aforementioned fibrous FQAZIBs can be knitted into the textile to fabricate a smart cloth.…”

“…e) Schematics of fibrous FQAZIBs and strain sensors. Reproduced with permission [147]. Copyright 2022, American Chemical Society.…”

Piezoelectric fibers for flexible and wearable electronics

“…The recent development of fiber-shaped piezoelectric devices has emerged as an innovative flexible and wearable platform [ 26 – 31 ]. Various fiber fabrication methods such as melting spinning, jet spinning, electrospinning, dip coating, chemical and physical deposition, electrochemical deposition, and hydrothermal synthesis have been developed [ 4 , 30 – 34 ]. However, these techniques require tedious and complicated procedures to fabricate fibers, and the resulting fibers are limited to simple architecture and functionalities.…”

Flexible and Antifreezing Fiber-Shaped Solid-State Zinc-Ion Batteries with an Integrated Bonding Structure

“…Toward practical wearable powering applications, Lei Wei et al incorporated a fiber-shaped zinc-ion battery with a strain sensor to obtain an integrated sensing system. The battery was assembled with MnO 2 -coated titanium fibers as the cathode and Zn foil as the anode and shows an energy density of 280 mAh at 0.1 A g −1 42.…”