Quantitative Electrochemical Analysis Method for Cu Impurities in Nickel-Cobalt-Manganese Cathode Materials.

Lithium-ion batteries are among the most important energy-storage devices. In this regard, nickel-cobalt-manganese (NCM) cathodes are widely used because of their high energy density and stability. Cu on NCM can enhance the overall performance by aiding lithium-ion transport through cation mixing; however, it leads to issues, such as internal short circuits.