Elon Musk’s Gigafactory pumps out batteries at or near $200 per kWh. The cost of coal is literally thousands of times cheaper—at $53 per megawatt hour (mWh). And considering energy produced from coal and natural gas is on-demand and won’t stop with every lull in the wind, it’s easy to understand why legacy energy sources are still fueling much of the globe’s 15-tWh-per-day energy habit.
That’s why Yet-Ming Chiang and his team at MIT’s department of Material Science and Engineering looked to sulfur as a battery base. It is readily available almost anywhere on Earth, a natural byproduct of natural gas and petroleum and, as far as energy density goes, it’s second only to water and air in terms of cost per stored charge.
Read more at Quartz