IBM Researchers announced a milestone in the area of materials science with a new battery discovery that could help eliminate the need for heavy metals in battery production.
As battery-powered alternatives for everything from vehicles to smart energy grids are explored, there remain significant concerns around the sustainability of available battery technologies.
Many battery materials, including heavy metals such as nickel and cobalt, pose tremendous environmental and humanitarian risks. Cobalt in particular, which is largely available in central Africa, has come under fire for careless and exploitative extraction practices.
Using three new and different proprietary materials, which have never before been recorded as being combined in a battery, a team at IBM Research has discovered a chemistry for a new battery which does not use heavy metals or other substances with sourcing concerns.
The materials for this battery are able to be extracted from seawater, laying the groundwork for less invasive sourcing techniques than current material mining methods.
In initial tests, the new battery’s composition proved it can be optimized to surpass the capabilities of lithium-ion batteries in a number of individual categories including lower costs, faster charging time, higher power and energy density, strong energy efficiency and low flammability.
Discovered in IBM Research’s Battery Lab, this design uses a cobalt and nickel-free cathode material, as well as a safe liquid electrolyte with a high flash point. This combination of the cathode and electrolyte demonstrated an ability to suppress lithium metal dendrites during charging, thereby reducing flammability, which is widely considered a significant drawback for the use of lithium metal as an anode material.
This discovery holds significant potential for electric vehicle batteries, for example, where concerns such as flammability, cost and charging time come into play. Current tests show that less than five minutes are required for the battery – configured for high power – to reach an 80 percent state of charge. Combined with the relatively low cost of sourcing the materials, the goal of a fast-charging, low-cost electric vehicle could become a reality.
In the quickly evolving arena of flying vehicles and electric aircrafts, having access to batteries with very high-power density, which can scale a power load quickly, is critical. When optimized for this factor, this new battery design exceeds more than 10,000 W/L, outperforming the most powerful lithium-ion batteries available. Additionally, IBM's tests have shown this battery can be designed for a long-life cycle, making it an option for smart power grid applications and new energy infrastructures where longevity and stability is key.
Overall, this battery has shown the capacity to outperform existing lithium-ion batteries not only in the previously listed applications, but can also be optimized for a range of specific benefits, including:
- Lower cost: The active cathode materials tend to cost less because they are free of cobalt, nickel, and other heavy metals. These materials are typically very resource-intensive to source, and also have raised concerns over their sustainability.
- Faster charging: Less than five minutes required to reach an 80 percent state of charge (SOC), without compromising specific discharge capacity.
- High power density: More than 10,000 W/L. (exceeding the power level that lithium-ion battery technology can achieve).
- High energy density: More than 800 Wh/L, comparable to the state-of-art lithium-ion battery.
- Excellent energy efficiency: More than 90 percent (calculated from the ratio of the energy to discharge the battery over the energy to charge the battery).
- Low flammability of electrolytes
To move this new battery from early stage exploratory research into commercial development, IBM Research has joined with Mercedes-Benz Research and Development North America, Central Glass, one of the top battery electrolyte suppliers in the world, and Sidus, a battery manufacturer, to create a new next-generation battery development ecosystem. While plans for the larger development of this battery are still in the exploratory phase, IBM hopes is that this budding ecosystem will help to bring these batteries into reality.
Moving forward, the team has also implemented an artificial intelligence (AI) technique called semantic enrichment to further improve battery performance by identifying safer and higher performance materials. Using machine learning techniques to give human researchers access to insights from millions of data points to inform their hypothesis and next steps, researchers can speed up the pace of innovation in this important field of study.