Performance Enhancement of the Li6 PS5 Cl-Based Solid-State Batteries by Scavenging Lithium Dendrites with LaCl3 -Based Electrolyte.

Li6 PS5 Cl (LPSC) is a very attractive sulfide-solid-electrolyte (SSE) for developing high-performance all-solid-state lithium batteries (ASSLBs). However, it cannot suppress the growth of lithium dendrites and then can only tolerate a small critical current density (CCD) before getting short-circuited to death. Learning from that a newly-developed LaCl3 -based electrolyte (LTLC) can afford very large CCD, we designed a three-layer sandwich-structured electrolyte by inserting LTLC inside LPSC. Remarkably, compared with bland LPSC, this hybrid electrolyte LPSC/LTLC/LPSC present extraordinary performance improvements: the CCD gets increased from 0.51 mA/cm2 to 1.52 mA/cm2 , the lifetime gets prolonged from 7 h to >500 h at the cycling current of 0.5 mA/cm2 in symmetric cells, and the cyclability gets extended from 10 cycles to >200 cycles at the cycling rate of 0.5 C and 30°C in Li|electrolyte|NCM721 full cells. The enhancing reasons are assigned to the capability of LTLC to scavenge lithium dendrites, forming a passive layer of Ta, La and LiCl. This article is protected by copyright. All rights reserved.