A group of billionaires including Bill Gates, Jeff Bezos, Jack Ma, and Richard Branson have invested in Form Energy. The company, out of MIT, is designing a new type of battery, thought to be based on sulfur. If early reports of success turn into practical solutions, the technology could store energy for months at a time at a fraction of the current cost.
The Readily-Available Solution
Form Energy has so far been reticent to reveal the exact details of their new technology. However, Yet-Ming Chiang, an MIT professor and one of the company’s founders, has confirmed that one of the solutions it is pursuing is a “sulfur-flow battery.” Chiang described this technology in some detail in a scientific paper in 2017.
Flow batteries generally consist of two tanks containing some form of electroactive chemical elements. The liquid is pumped through a central charging chamber containing positive and negative electrodes (anode and cathode). This is where the energy storage and energy release process takes place. The chamber is separated in two by a membrane that ensures the liquids don’t come into actual contact with each other, as shown in the video.
The advantages of flow batteries include easy scalability and long cycle life. Among its disadvantages are relatively low energy density and high component cost.
Form Energy’s use of sulfur, which is both cheap and abundant, lowers those costs dramatically.
As described in PV-Magazine, the battery uses sulfur in the anode and aerated liquid salt in the cathode. Oxygen flowing in and out of the cathode makes the battery discharge and charge.
“This battery literally inhales and exhales air, but it doesn’t exhale carbon dioxide, it exhales oxygen. What this does is create a charge balance by taking oxygen in and out of the system,” Yet-Ming Chiang explained to PV-Magazine.
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