In his third article in the series, Lithium‑ion specialist Rick Howard looks at the trials and tribulations of creating lithium cathodes that charge over 4.5 volts.
In the Spring 2011 issue of BEST, I described modified Li-ion cathode materials, and how structural stability, longevity, and rapid discharge capability can be affected by doping known intercalants with a few percent of other metals. But is that good enough, especially as the industry is seriously developing cathode compounds that charge above 4.5V? It is insufficient to look only at one component of . . .
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