Toyota Motor Corp. is developing a magnesium battery that has twice the energy of lithium-ion cells, according to Jeffrey Makarewicz, the engineer managing the U.S. project, who was interviewed at the North American International Auto Show in Detroit. He said that Toyota’s technical center in Ann Arbor, Mich., is working on the magnesium-sulfur battery, which complements the development of other future electric-power chemistries at Toyota labs in Japan.
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