A prototype battery at VoltStorage in Munich. It’s based on a chemical process that can store and discharge electricity over days, not just hours like today’s most popular battery technology.Lena Mucha for The New York Times
LONDON — When Jakob Bitner was 7, he left Russia for Germany with his parents and sister. Twenty-eight years later, he is set on solving a vexing green-energy problem that could help Germany end its dependence on imported energy from Russia, or anywhere.
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