MRS Meetings and Events


EN02.18.01 2023 MRS Fall Meeting

Critical Interphase Overpotential as a Lithium Dendrite Suppression Criterion for All-Solid-State Lithium Battery Design

When and Where

Dec 1, 2023
1:30pm - 1:45pm

Hynes, Level 3, Room 304



Hongli Wan1,Chunsheng Wang1

University of Maryland, College Park1


Hongli Wan1,Chunsheng Wang1

University of Maryland, College Park1
Suppressing Li dendrite growth is a crucial challenge in the development of all-solid-state Li-metal batteries (ASSLBs). Penetration of Li dendrites through the solid-state electrolyte (SSE) can lead to short-circuiting of the cells, presenting a safety concern. The current density at which Li dendrites penetrate through the SSE and cause short-circuiting is termed the critical current density (CCD). The CCD not only depends on the intrinsic properties of the SSE but also on the thickness of the SSE. Furthermore, as the Li plating or stripping capacity, stack pressure, and interfacial resistance change the overpotential, which is the driving force for Li plating and stripping, these factors also change the CCD. Thus, because the CCD is not an intrinsic property of an SSE, it is difficult to use CCDs to design SSEs. Herein, we evaluate the lithium dendrite suppression capability of SSE using critical interphase overpotential (CIOP). The CIOP is the intrinsic property of the interphase, which depends on electronic/ionic conductivity, lithiophobicity, and mechanical strength. When the applied interphase overpotential (AIOP) is larger than CIOP, Li will grow into interphase as dendrites. To reduce AIOP but increase CIOP, we design a mix-conductive Li<sub>2</sub>NH-Mg interlayer between Li<sub>6</sub>PS<sub>5</sub>Cl SSE and Li-1.0wt%La anode, which transfers into Li<sub>6</sub>PS<sub>5</sub>Cl/LiMgS<i><sub>x</sub></i>/LiH-Li<sub>3</sub>N/LiMgLa after Mg migration during annealing and activation cycles. The LiMgS<i><sub>x</sub> </i>interphase increases the CIOP from 9~12mV (of Li<sub>6</sub>PS<sub>5</sub>Cl) to ~220mV. The Li plates on LiMgLa surface and reversible penetration into the formed porous LiH-Li<sub>3</sub>N reducing AIOP. The CIOP provides design guidelines for high-energy and room-temperature all-solid-state lithium-metal batteries.

Symposium Organizers

Yi Lin, NASA Langley Research Center
Fang Liu, University of Wisconsin--Madison
Amy Marschilok, Stony Brook University
Xin Li, Harvard University

Symposium Support

Verder Scientific, Inc.

Publishing Alliance

MRS publishes with Springer Nature