Investigation on cell impedance for high-power lithium-ion batteries

Variation of the dc polarization with time has been successfully calculated semiempirically for the lithium-ion battery at a variety of discharging rates. In particular, with the help of circuit analysis, the contribution of the uncompensated ohmic resistance, interfacial impedance, and diffusion impedance to total cathodic polarization has been satisfactorily differentiated as a function of discharging time. In the present work, a simple and practical method has been suggested to help one design effectively the high-power lithium-ion batteries. Dedicated to Professor Su-II Pyun on the occasion of his 65th birthday.