Renewable energy sources like wind and solar power are crucial for the sustainability of our planet. However, a major challenge with these sources is that they do not always generate power when needed. To maximize their potential, efficient and affordable energy storage solutions are required. Columbia Engineering material scientists have been working on developing new batteries to address this issue. In a recent study published in Nature Communications, the team used K-Na/S batteries that combine potassium, sodium, and sulfur to create a low-cost, high-energy solution for long-duration energy storage. This innovation could help stabilize energy grids, reduce dependence on fossil fuels, and support a more sustainable energy future.
One of the main challenges with K-Na/S batteries is their low capacity due to the formation of inactive solid blocks that block the diffusion process. Additionally, these batteries require high temperatures for operation, making the process complex and costly. Previous studies have struggled with these issues, leading to the search for new techniques to improve battery performance. The team developed a new electrolyte using acetamide and ε-caprolactam as solvents to help the battery store and release energy more efficiently. This electrolyte can dissolve the solid blocks, enhancing energy and power density while allowing the battery to operate at a lower temperature of around 75°C, almost at the maximum energy storage capacity.
Yang’s group is affiliated with the Columbia Electrochemical Energy Center (CEEC), which focuses on discovering groundbreaking technology and accelerating commercialization in the field of electrochemical energy. The center brings together faculty and researchers from the School of Engineering and Applied Science with interests in electrons, devices, and systems related to electrochemical energy. With industry partnerships, CEEC aims to realize breakthroughs in energy storage and conversion, leading to a sustainable energy future. The team is currently working on scaling up the technology from small coin-sized batteries to store larger amounts of energy from renewable sources, providing a stable and reliable power supply even during periods of low sun or wind. The next steps involve optimizing the electrolyte composition for improved performance.
In conclusion, the development of efficient and affordable energy storage solutions is crucial for maximizing the potential of renewable energy sources like wind and solar power. Columbia Engineering material scientists have made significant progress in developing K-Na/S batteries that offer a low-cost, high-energy solution for long-duration energy storage. By overcoming challenges such as low capacity and high operating temperatures, these batteries have the potential to stabilize energy grids, reduce dependence on fossil fuels, and support a more sustainable energy future. With the support of the Columbia Electrochemical Energy Center and industry partnerships, the team is working towards scaling up this technology to store larger amounts of energy, ensuring a reliable power supply from renewable sources regardless of fluctuations in wind or sunlight.