Why Is It So Hard to Make Batteries Smaller and Lighter? (IMAGE)
Caption
Scanning electron micrograph of a frozen, failed lithium metal battery showing the copper current collector (pink), reacted lithium (labeled SEI)/electrolyte (tan), gas cavities (grey), shredded separator (green), and lithium (red) trapped in separator.
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Image courtesy of National Renewable Energy Laboratory
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Image courtesy of National Renewable Energy Laboratory
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