A rechargeable battery from Harvard just got a little greener . By replacing a corrosive and toxic component with a compound commonly used as a food additive, chemists have come up with renewable energy storage technology that they report is safe to use in homes and businesses. Should the design prove scalable, the researchers say it has the potential to top lithium batteries such as the Powerwall from Tesla Motors TSLA +0.79% in terms of cost as well as length of time it could operate at peak power.

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