Lithium iron phosphate has no known carcinogenicity whereas lithium cobalt oxide does because it contains cobalt, which is listed as a possible human carcinogen by the IARC.
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In 2008 China Sun developed a next generation “green” power source in the form of lithium iron phosphate (LiFePO4) that can be built into batteries that power electric cars, hybrids, scooters, and other state-of-the-art electronic devices.