| http://www.w3.org/ns/prov#value | - ???The advantage of using a renewable material for charge storage is the enormous amount of this material that is already being produced on Earth by growing plants, which contain about 20 to 30 percent lignin,??? Ingan??s said in a statment. ???Lithium-ion batteries, on the other hand, require metal oxides; and some of those materials, such as cobalt, are rather rare.???
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