Anchoring polysulfide with artificial solid electrolyte interphase for dendrite- free and low N/P ratio Li-S batteries

Lithium sulfur batteries are regarded as a promising candidate for high -energy -density energy storage devices. However, the lithium metal anode in lithium -sulfur batteries encounters the problem of lithium dendrites and lithium metal consumption caused by polysulfide corrosion. Herein we design a dual -function PMMA/PPC/LiNO3 composite as an artificial solid electrolyte interphase (PMCN -SEI) to protect Li metal anode. This SEI offers multiple sites of C@O for polysulfide anchoring to constrain cor-rosion of Li metal anode. The lithiated polymer group and Li3N in PMCN -SEI can homogenize lithium -ion deposition behavior to achieve a dendrite -free anode. As a result, the PMCN -SEI pro-tected Li metal anode enables the Li || Li symmetric batteries to maintain over 300 cycles (1300 h) at a capacity of 5 mA h cm-2, corresponding to a cumulative capacity of 3.25 Ah cm-2. Moreover, Li -S bat-teries assembled with 20 lm of Li metal anode (N/P = 1.67) still deliver an initial capacity of 1166 mA h g-1 at 0.5C. Hence, introducing polycarbonate polymer/ inorganic composite SEI on Li pro -vides a new solution for achieving the high energy density of Li -S batteries. (c) 2023 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.