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Researchers warn that alternatives to cobalt, nickel, and other rare metals must be found soon to meet the rising demands of electric-vehicle cells, as their scarcity is driving up prices: the former quadrupled over the past two years, from $22 to $81 per kilogram. In light of producers cutting corners and violating environmental and safety regulations, scientists and engineers are urged to explore cheap, common metals such as iron and copper as potential replacements.
The most promising alternative, in our view, is to use conversion materials in electrodes. Copper and iron fluorides and silicon react with the lithium ions. A transition metal in a conversion cathode can host up to six times more lithium atoms than one in a standard cathode. Such materials swell more to accommodate the extra lithium atoms. Cell designs must allow for this distortion.
The most promising alternative, in our view, is to use conversion materials in electrodes. Copper and iron fluorides and silicon react with the lithium ions. A transition metal in a conversion cathode can host up to six times more lithium atoms than one in a standard cathode. Such materials swell more to accommodate the extra lithium atoms. Cell designs must allow for this distortion.