The material, based on transition metal oxides, combines the functions of a battery and a display system. As it charges and discharges, the oxide undergoes changes linked to electrochromism, causing it to shift color in direct proportion to the amount of stored energy.
In practical terms, the material can appear transparent or lightly colored when discharged and turn darker—often blue—as it accumulates charge. This built-in visual cue eliminates the need for external sensors or electronic indicators to monitor battery levels.
Scientists say the innovation could simplify the design of energy storage systems, making them more intuitive and cost-effective. The dual-function capability is particularly promising for applications such as wearable electronics, smart windows, and flexible devices, where space and efficiency are critical.
Experts believe that such self-reporting materials could improve safety by allowing users to instantly gauge battery status, reducing the risk of overcharging or unexpected power loss.
Publication details (DOI): https://doi.org/10.1039/D6TA01049K
