'Battery' that bottles sunshine could bring a new solar revolution

January 16, 2018

Solar energy is clean, abundant, and irritatingly inconvenient: It doesn’t work at night or on cloudy days. You can convert sunshine into electricity and store it in a battery, but that’s complicated and expensive. And much of the time, what you really want isn’t electricity but heat for tasks like cooking or warming homes. What you want, in other words, is a way to bottle the heat of the noonday sun and then uncork it on demand.