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Cobalt oxide (CoO) is a promising electrode for high‐energy‐density Li‐ion batteries (LIBs), where the charge storage is believed to take place solely during the electrochemical oxidation/reduction processes. However, this simple picture has been increasingly challenged by reported anomalously large storage capacities, indicating the existence of undiscovered extra charge reservoirs inside the system...
In article number 2006629, Hongsen Li, Yunze Long, Qiang Li, and co‐workers use an advanced operando magnetometry technique to probe the charge‐storage mechanism of CoO lithium‐ion batteries, showing that the anomalous discharge capacity in this particular system is associated with both the reversible formation of a spin capacitor and the growth of a polymeric film at low voltages. The key catalytic...
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