2020/09/10 by Ankit Agrawal, Yierpan Aierken, Agrawal, Ankit +9
Engineering · Physics and Astronomy · #Advanced Battery Materials and Technologies #Advanced Battery Technologies Research #Advancements in Battery Materials #Applied Physics (physics.app-ph) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #cond-mat.mtrl-sci #physics.app-ph
paper · pdf · doi:10.48550/arxiv.2009.04888
arxiv created 2020/09/10 · openalex publication_date 2020/09/10 · arxiv updated 2020/09/11 · openalex created_date 2020/09/14 · openalex updated_date 2026/07/28
Solid-ion conductors (SICs) comprising non-ionic plastic crystals and lithium salts often require compositing with polymers to render them processable for use in solid-state lithium-metal batteries. Here, we show that polymer-doped plastic crystal SICs form a previously unrecognized plastic crystal-polymer high entropy interphase, where ions selectively partition and exhibit a higher fraction of matrix-separated ion pairs than in the bulk. Liithium ion diffusivity in this interphase is an order of magnitude higher than in other microenvironments due to an increase in the molar volume of the plastic crystal in the vicinity of the polymer, which increases the frequency of bond rotation in the plastic crystal required for ion conduction. Surprisingly, the polymer does not directly participate in ion transport. These insights led us to prepare SICs from specific polymers, plastic crystals, and lithium halide salts that concomitantly deliver fast ion conduction at ambient and sub-ambient temperatures and sustainable passivation of the lithium anode.