Cobalt will always be part of the cathode....
On February 23 CNBC reported: "Why companies are scrambling for the once little-known element cobalt. The once little-known element cobalt is rapidly rising in price, and some warn shortages could hit the metal in the future. The proliferation of lithium-ion batteries, of which cobalt is a key ingredient, in electronics and electrified vehicles is the chief factor fueling this rise in price and concerns among companies over the security of their supplies. Apple is reportedly trying to procure its cobalt directly from miners. Automakers such as BMW and Volkswagen have also reportedly been taking similar steps. Demand for cobalt in vehicle battery materials is expected to grow over 40 percent in 2018, according to U.K.-based cobalt trading firm Darton Commodities. "There isn't a better element than nickel to increase energy density, and there isn't a better element than cobalt to make the stuff stable," said Marc Grynberg, CEO of materials company Umicore, in an interview with Reuters. "So (while) you hear about designing out cobalt, this is not going to happen in the next three decades. It simply doesn't work."
On March 22 Design News wrote, "Understanding the role of cobalt in batteries. Cobalt will remain an expensive but necessary ingredient in our battery energy future. A new report by the Helmholtz Institute Ulm (HIU) in Germany suggests that worldwide supplies of lithium and cobalt, materials used in electric vehicle batteries, will become critical by 2050. The situation for cobalt, a metal that is typically produced as a byproduct of copper and nickel mining, appears to be especially dire as “…the cobalt demand by batteries might be twice as high as the today’s identified reserves,” the HIU report stated. HIU indicated that lithium reserves would be “much less strained” if the current production levels could be dramatically up-scaled.....Because the working voltage of a battery is determined by the difference in electrochemical potential between the cathode and the anode, the cathode must be another material than graphite, and the choice of this material controls most of the performance characteristics of the lithium ion battery..... Abraham explained: “From our experience, at least small amounts of cobalt are needed in the material because it appears to help the rate performance—the rate at which the power is delivered.” Electric vehicles need to have batteries that accept lithium ions at a high rate during charging and deliver lithium ions at a high rate during discharge. Abraham said about 10% cobalt appears to be necessary enhance the rate properties of the battery."
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