Can’t get any smaller: Battery in a nanowire
RICE U. (US) — Researchers have packed a lithium ion battery into a single nanowire, creating what may be the smallest possible version of such energy storage devices.
Engineers at Rice University say the battery could be valuable as a rechargeable power source for new generations of nanoelectronics.
In the journal Nano Letters, researchers describe testing two versions of their battery/supercapacitor hybrid. The first is a sandwich with nickel/tin anode, polyethylene oxide (PEO) electrolyte and polyaniline cathode layers; it was built as proof that lithium ions would move efficiently through the anode to the electrolyte and then to the supercapacitor-like cathode, which stores the ions in bulk and gives the device the ability to charge and discharge quickly.
A schematic shows nanoscale battery/supercapacitor devices in an array. The batteries show promise for powering nanoscale electronics and as a research tool for understanding electrochemical phenomenon at the nanoscale. (Credit: Ajayan Lab, Rice University)
The second packs the same capabilities into a single nanowire. The researchers built centimeter-scale arrays containing thousands of nanowire devices, each about 150 nanometers wide. A nanometer is a billionth of a meter, thousands of times smaller than a human hair.
Pulickel Ajayan, the lead researcher, and his team have been inching toward single-nanowire devices for years. They first reported the creation of three-dimensional nanobatteries last December. In that project, they encased vertical arrays of nickel-tin nanowires in PMMA, a widely used polymer best known as Plexiglas, which served as an electrolyte and insulator.
They grew the nanowires via electrodeposition in an anodized alumina template atop a copper substrate. They widened the template’s pores with a simple chemical etching technique that created a gap between the wires and the alumina, and then drop-coated PMMA to encase the wires in a smooth, consistent sheath. A chemical wash removed the template and left a forest of electrolyte-encased nanowires.
In that battery, the encased nickel-tin was the anode, but the cathode had to be attached on the outside.
The new process tucks the cathode inside the nanowires, says Ajayan, a professor of mechanical engineering and materials science. In this feat of nanoengineering, the researchers used PEO as the gel-like electrolyte that stores lithium ions and also serves as an electrical insulator between nanowires in an array.
After much trial and error, they settled on an easily synthesized polymer known as polyaniline (PANI) as their cathode. Drop-coating the widened alumina pores with PEO coats the insides, encases the anodes and leaves tubes at the top into which PANI cathodes could also be drop-coated. An aluminum current collector placed on top of the array completes the circuit.
“The idea here is to fabricate nanowire energy storage devices with ultrathin separation between the electrodes,” says Arava Leela Mohana Reddy, a research scientist at Rice and co-author of the paper. “This affects the electrochemical behavior of the device. Our devices could be a very useful tool to probe nanoscale phenomenon.”
The team’s experimental batteries are about 50 microns tall—about the diameter of a human hair and almost invisible when viewed edge-on, Reddy said. Theoretically, the nanowire energy storage devices can be as long and wide as the templates allow, which makes them scalable.
The nanowire devices show good capacity; the researchers are fine-tuning the materials to increase their ability to repeatedly charge and discharge, which now drops off after a about 20 cycles.
“There’s a lot to be done to optimize the devices in terms of performance,” says the paper’s lead author, Sanketh Gowda, a chemical engineering graduate student. “Optimization of the polymer separator and its thickness and an exploration of different electrode systems could lead to improvements.”
The Hartley Family Foundation, Rice University, National Institutes of Health, Army Research Office, and Multidisciplinary University Research Initiative supported the research.
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