Study on discharge capacity of lithium-ion batteries based on the Li distribution characteristics

The distributions of Li concentration in the electrode particleare simulated by a multi-scale coupling model of lithium-ion batteries during discharging at different operating conditions. This paper have estimated the discharge capacity on the basis of the amount of de-intercalated/intercalated Li from the electrode particles. With fixing discharge current at 1 C, the discharge capacity decreases rapidly as the ambient temperature decreases from 25℃ to 0℃, while it changes little when the temperature increases from 25℃ to 40℃. Correspondingly, the discharge capacity decreases as the discharging current increases from 0 C to 4 C with keeping the ambient temperature at 25℃, while it basically remains unchanged as the discharging current increases from 4 C to 10 C.