Important Role of Ion Flux Regulated by Separators in Lithium Metal Batteries.

Polyolefin separators are the most common separators used in rechargeable lithium (Li)-ion batteries. However, the influence of different polyolefin separators on the performance of Li metal batteries (LMBs) has not been well studied. By performing particle injection simulations on the reconstructed three-dimensional pores of different polyolefin separators, it was revealed that the pore structure of the separator had a significant impact on the ion flux distribution, the Li deposition behavior and consequently, the cycle life of LMBs. It was also discovered that the homogeneity factor of Li ion toward Li metal electrode was positively correlated to the longevity and reproducibility of LMBs. This work not only emphasizes the importance of pore structure of polyolefin separators, but also provides an economic and effective method to screen favorable separators for LMBs. This article is protected by copyright. All rights reserved.