Markus Niederberger’s team of researchers at ETH has used stretchable materials to develop a battery that can be bent, stretched and twisted. For applications in bendable electronic devices, this is precisely the kind of battery they need.
Today’s electronics industry is increasingly focusing on computers or smartphones with screens that can be folded or rolled. Smart clothing items make use of wearable micro-devices or sensors to monitor bodily functions, for example. However, all these devices need an energy source, which is usually a lithium-ion battery. Unfortunately, commercial batteries are typically heavy and rigid, making it fundamentally unsuitable for applications in flexible electronics or textiles.
A remedy for this problem is now being created by Markus Niederberger, Professor for Multifunctional Materials at ETH Zurich, and his team. The researchers have developed a prototype for a flexible thin-film battery that can be bent, stretched and even twisted without interrupting the supply of power.
What makes this new battery special is its electrolyte – that part of the battery through which lithium-ions move when the battery is charged or discharged. This electrolyte was discovered by ETH doctoral student Xi Chen, lead author of the study that recently appeared in the scientific journal Advanced Materials.
Systematically employing bendable components
Following the design of commercial batteries, this new type of battery is built in layers like a sandwich. However, it marks the first time that researchers have used flexible components to keep the whole battery bendable and stretchable. “To date, no one has employed exclusively flexible components as systematically as we have in creating a lithium-ion battery,” Niederberger says.
The two current collectors for the anode and the cathode consist of bendable polymer composite that contains electrically conductive carbon and that also serves as the outer shell. On the interior surface of the composite, the researchers applied a thin layer of micronsized silver flakes. Due to the way the flakes overlap like roof tiles, they don’t lose contact with one another when the elastomer is stretched. This guarantees the conductivity of the current collector even if it is subjected to extensive stretching. And in the event that the silver flakes do in fact lose contact with each other, the electrical current can still flow through the carbon-containing composite, albeit more weakly.
With the help of a mask, the researchers then sprayed anode and cathode powder onto a precisely defined area of the silver layer. The cathode is composed of lithium manganese oxide and the anode is a vanadium oxide.
Water-based gel electrolyte
In the final step, the scientists stacked the two current collectors with the applied electrodes on top of each other, separated by a barrier layer similar to a picture frame, while the gap in the frame was filled with the electrolyte gel.
Niederberger emphasises that this gel is environmentally more friendly than the commercial electrolytes: “Liquid electrolyte in today’s batteries are flammable and toxic.” In contrast, the gel electrolyte that his doctoral student Chen developed contains water with a high concentration of a lithium salt, which not only facilitates the flow of lithium ions between cathode and anode while the battery is charging or discharging, but also keeps the water from electrochemical decomposition.
The scientists joined the various parts of their prototype together with adhesive. “If we want to market the battery commercially, we’ll have to find another process that will keep it sealed tight for a longer period of time,” Niederberger says.
Numerous potential applications
More and more applications for a battery like this are emerging every day. Well-known manufacturers of mobile phones are vying with each other to produce devices with foldable screens. Other possibilities include rollable displays for computers, smartwatches and tablets, or functional textiles that contain bendable electronics – and all of these require a flexible power supply. “For instance, you could sew our battery right into the clothing,” Niederberger says. What’s important is, in the event of battery leakage, to ensure that the liquids that come out cause no damage. This is where the team’s electrolyte offers a considerable advantage.
However, Niederberger stresses that more research is necessary to optimise the flexible battery before they consider commercialising it. Above all, the team has to increase the amount of electrode material it can hold. A new doctoral student has recently begun refining the stretchable power supply. The inventor of the initial prototype, Xi Chen, returned to his homeland of China after completing his doctoral thesis to take up a new job – as a consultant for the battery industry.
Learn more: A battery with a twist
The Latest on: Stretchable materials
via Google News
The Latest on: Stretchable materials
- Stretch Zone Louisville does all the work for you while increasing range of motionon October 12, 2021 at 4:30 am
Unlock your body’s flexibility with Stretch Zone Louisville. WDRB's Keith Kaiser learns about the benefits of stretching. When you visit Stretch Zone, a trained stretch practitioner leads you through ...
- Stretchable Conductors in Electronics Market to Eyewitness Massive Growth by 2028: Toyobo, Vorbeck Materials, Ares Materialson October 11, 2021 at 11:57 am
The Stretchable Conductors in Electronics Market research report includes an in-sight study of the key Global Stretchable Conductors in Electronics Market prominent players along with the company ...
- 42 Stylish Things That Have Stretchy Waistbands So You're Always Comfortableon October 10, 2021 at 6:00 am
I consider two things when I buy something new for myself: how stylish is this? And quickly after, how comfortable is this? While style still unusually wins out, when I find a piece with a winning ...
- Stretch of I-94 renamed after late MDOT workeron October 7, 2021 at 12:10 pm
A stretch of I-94 in Berrien County has been renamed after an MDOT work who died while working on the freeway.
- Layer Up! This Stretchy, Lightweight Cardigan Is 40% Off at Nordstromon October 4, 2021 at 7:19 am
This Vero Moda Lucy Ribbed V-Neck Cardigan is lightweight and chic and so perfect for layering this fall and winter and beyond — details ...
- A New Stretchable Tool Generates Electrical Power With Tiny Magnetson October 2, 2021 at 1:30 pm
Chen and his team further reported that the magnetoelastic effect they observed was four times greater than similarly sized setups with rigid metal alloys.
- This New Battery Inspired By Scales Can Bend and Stretch Like A Snakeon October 2, 2021 at 6:17 am
The Korean Institute of Machinery and Materials (KIMM) has developed a battery that opens up some interesting possibilities in energy storage. Researchers developed this battery with high safety and ...
- Are Stretchable Electronics The Next Evolution in Wearable Technology?on October 1, 2021 at 4:00 pm
Flexible PCBs add immense functionality, but what about stretchable electronics? New research is demonstrating just how malleable electronics design can be.
- Stretchable wearable device uses tiny magnets to generate electricityon October 1, 2021 at 12:21 pm
While we've been hearing a lot about wearable piezoelectric devices that produce electricity from people's movements, such gadgets don't work well under certain conditions. A new bioelectric wearable, ...
- Smart Solutions: Wood's warmth can stretch through your home designon September 30, 2021 at 2:14 pm
Whether you select the classic surface for your countertops, furniture, walls or décor, the organic material has a lot to offer.
via Bing News