Wednesday, 4 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)
In this research, high rate performance of LiNi0.5Mn1.5O4 cathode has been explained in details by a model, numerical simulation technique and experimental verification. The proposed model which was verified by experimental data and simulation could estimate the capacity dependency of LiNi0.5Mn1.5O4 to diffusion coefficient of lithium ions in active materials and c-rate of discharging. Results showed that LiNi0.5Mn1.5O4 has capacity higher than 80 mAhg-1 even for c-rate up to 10C discharging and facilitating the movement of lithium ions in active material and reducing thickness of electrolyte has reasonable impact on achievable final capacity of LiNi0.5Mn1.5O4. In addition, higher rate performance of mentioned active material would be enhanced by an increase in Li ion diffusion coefficient from 10-11 cm2.s-1 to 5×10-10 cm2.s-1 which was explained and verified by experiment. Achieved capacity at 200C would be less than 40 mAh.g-1 in cathode materials with Li ion diffusion coefficient 10-11 cm2.s-1. Whereas, cathode materials with Li ion diffusion coefficient 5×10-10 cm2.s-1 showed achieved capacity higher than 100 mAh.g-1 at 200C.