ABSTRACT During the operation of lithium‐ion batteries, uncontrollable lithium dendrite growth often occurs, resulting in internal short circuits and a significant reduction in cycle life, which poses a major obstacle to their practical application. Modification of the separator has emerged as one of the key strategies to suppress lithium dendrite formation. In this study, we modify the surface of a commercial polypropylene (PP) separator using two‐dimensional zeolite Y (2D‐Y) for lithium‐ion batteries. The uniform pores of the zeolite Y provide an effective platform for the homogeneous distribution of lithium ions. The results show that the 2D‐Y coating can mitigate the growth of lithium dendrites, thus improving the cell performance. The capacity retention of the 2D‐Y‐PP cell reaches 77.14% after 1000 cycles at 2C, which is significantly better than the capacity retention of the bare PP cell (less than 25%). At a current density of 0.1 mA cm −2 , the lithium deposition overpotential of the 2D‐Y‐PP lithium symmetric cell is reduced by 56% compared to the bare PP cell, and the symmetric cell cycle life exceeds 2000 h. Furthermore, the homogenization of lithium deposition is clearly evidenced after 200 cycles. This study demonstrates that the sieving effect of inorganic zeolite coatings modulates lithium deposition kinetics, offering a novel research idea for designing high‐safety lithium metal batteries.
Deng et al. (Fri,) studied this question.