Abstract :
In order to study the dynamic properties of LixMn2O4, potential relaxation techniques (PRT) is used to measure the chemical diffusion coefficient of LixMn2O4. Results are presented for x ranges from x=0.1 to 0.9. They show that the chemical diffusion coefficient at the two-phase coexistent stage near x=0.3 and 0.7 is higher than at the single-phase stage during the insertion and extraction process. Monte Carlo (MC) simulations are also used to simulate the ionic conductivity σ of Li ions in LixMn2O4 and its dependence as a function of lithium concentration x. The results show an M shaped curve in the plot of ionic conductivity σ versus x when the simulation temperature is 293 K, which confirms the experimental PRT results. The voltage profiles of LixMn2O4/Li cells were also simulated with different boundary conditions.
