Researchers in the Cockrell School of Engineering at The University of Texas at Austin have built a new type of battery that combines the many benefits of existing options while eliminating their key shortcomings and saving energy.
Most batteries are composed of either solid-state electrodes, such as lithium-ion batteries for portable electronics, or liquid-state electrodes, including flow batteries for smart grids. The UT researchers have created what they call a “room-temperature all-liquid-metal battery,” which includes the best of both worlds of liquid-state batteries and solid-state batteries.
Solid-state batteries feature significant capacity for energy storage, but they typically encounter numerous problems that cause them to degrade over time and become less efficient. Liquid-state batteries can deliver energy more efficiently, without the long-term decay of sold-state devices, but they either fall short on high energy demands or require significant resources to constantly heat the electrodes and keep them molten.
The metallic electrodes in the team’s battery can remain liquefied at a temperature of 20 degrees Celsius, the lowest operating temperature ever recorded for a liquid-metal battery. This represents a major change, because current liquid-metal batteries must be kept at temperatures above 240 degrees Celsius.
This battery can provide all the benefits of both solid- and liquid-state — including more energy, increased stability and flexibility — without the respective drawbacks, while also saving energy.
The research team published a paper on the room-temperature battery in the journal Advanced Materials.
The battery includes a sodium-potassium alloy as the anode and a gallium-based alloy as the cathode. In the paper, the researchers note that it may be possible to create a battery with even lower melting points using different materials.
The room-temperature battery promises more power than today’s lithium-ion batteries, which are the backbone of most personal electronics. It can charge and deliver energy several times faster.
Because of the liquid components, the battery can be scaled up or down easily, depending on the power needed. The bigger the battery, the more power it can deliver. That flexibility allows these batteries to potentially power everything from smartphones and watches to the infrastructure underpinning the movement toward renewable energy.
Given the high energy and power density demonstrated, this innovative cell could be potentially implemented for both smart grid and wearable electronics.
The researchers have spent more than three years on this project, but the job isn’t done yet. Many of the elements that constitute the backbone of this new battery are more abundant than some of the key materials in traditional batteries, making them potentially easier and less expensive to produce on a large scale. However, gallium remains an expensive material. Finding alternative materials that can deliver the same performance while reducing the cost of production remains a key challenge.
The next step to increasing the power of the room-temperature battery comes in improving the electrolytes — the components that allow the electrical charge to flow through the battery.
News Source: The University of Texas at Austin
