Quantitative analysis of the inhibition effect of rising temperature and pulse charging on Lithium dendrite growth

Lithium (Li) metal is considered a promising negative electrode material for high theoretical energy batteries. However, the growth of Li dendrite increases polarization, reduces battery capacity, and connects the positive and negative electrodes, which will probably lead to explosions. Therefore, inhibiting Li dendrites is critical for Li metal battery application and safety. In this paper, the effect of temperature on Li dendrite is analyzed quantitatively by coupling the nonlinear phase-field and thermal models. The effect of temperature on dead Li is also studied. The suitable frequency for Li dendrite inhibition can be obtained by changing the frequency of the pulse charging. On the basis of the simulation results, the mechanisms of inhibiting Li dendrites by rising temperature and pulse charging are also analyzed. The investigation of the average growth rate of dendrites under different overpotential values and diffusion coefficients indicates that the gap between the reaction and diffusion rates must be narrowed to inhibit Li dendrites. This work provides a deep understanding of and direction toward inhibiting Li dendrites.

Automated summary

This study quantitatively analyzes the effect of temperature on Li dendrites, studies the effect of different frequencies of pulse charging on inhibiting Li dendrites, and analyzes the mechanisms of Li dendrite inhibition. The research results can provide guidance for inhibiting Li dendrites.