Scientists Develop Liquid Battery to Capture and Store Solar Heat Efficiently

A team from UC Santa Barbara has unveiled a cutting-edge solar energy storage method that harnesses sunlight and retains it as heat in a liquid form, releasing it precisely when needed.

One persistent obstacle in solar technology is effectively storing energy for use during non-sunny periods. Conventional approaches often depend on large, expensive batteries or power grids with inherent drawbacks. The UCSB researchers tackled this issue by engineering a novel substance capable of storing solar power and discharging it as thermal energy.

Innovative Solar Energy Storage Material

The compound, called pyrimidone, operates similarly to a rechargeable battery but stores sunlight energy as heat instead of electricity. When sunlight hits the molecule, it absorbs energy and changes into a high-energy configuration. This stored heat can be released on demand when activated by heat or catalysts. The process resembles how photochromic lenses darken outdoors and clear indoors.

Add Cosmo Herald as a Preferred Source

“We want to use the same reversible process to store energy and release it when needed,” said lead author Han Nguyen, a doctoral student in the Han Group.

Published in Science, this breakthrough is notable for pyrimidone’s energy density, which surpasses traditional lithium-ion batteries by more than twofold. This enables compact, efficient solar energy storage without necessitating bulky systems.

Solar flare captured by the SDO satellite. Credit: NASA/GFSC/SDO

Converting Sunlight Into Usable Heat

The researchers demonstrated that the heat released from pyrimidone was sufficient to bring water to a boil, a process usually demanding high energy input.

“The fact that we can boil water under ambient conditions is a big achievement.” said Nguyen.

This capacity for producing concentrated heat suggests versatile uses, including off-grid heating and residential hot water supply.

Since pyrimidone dissolves in water, it could be circulated through rooftop solar panels during daylight, storing heat for nighttime use. This approach could eliminate the need for extra battery storage commonly required in solar energy setups.

Sustainable and Long-Lasting Solar Storage

Beyond its impressive energy capacity, pyrimidone is designed for repeated reuse without notable decline in performance. Unlike many conventional battery technologies that degrade over time, this material allows continuous solar energy storage and release. Co-author Benjamin Baker highlighted in a University of California statement:

“With molecular solar thermal energy storage, the material itself is able to store that energy from sunlight,” eliminating the need for bulky, short-lifespan batteries.

This advancement could significantly reduce environmental impact by lessening dependence on scarce materials and minimizing electronic waste linked to traditional batteries. Pyrimidone offers a greener, more sustainable alternative for future energy storage solutions.