Role of Interfacial Defects on Electro–Chemo–Mechanical Failure of Solid-State Electrolyte
Artikel i vetenskaplig tidskrift, 2023

High-stress field generated by electroplating of lithium (Li) in pre-existing defects is the main reason for mechanical failure of solid-state electrolyte because it drives crack propagation in electrolyte, followed by Li filament growth inside and even internal short-circuit if the filament reaches another electrode. To understand the role of interfacial defects on mechanical failure of solid-state electrolyte, an electro–chemo–mechanical model is built to visualize distribution of stress, relative damage, and crack formation during electrochemical plating of Li in defects. Geometry of interfacial defect is found as dominating factor for concentration of local stress field while semi-sphere defect delivers less accumulation of damage at initial stage and the longest failure time for disintegration of electrolyte. Aspect ratio, as a key geometric parameter of defect, is investigated to reveal its impact on failure of electrolyte. Pyramidic defect with low aspect ratio of 0.2–0.5 shows branched region of damage near interface, probably causing surface pulverization of solid-state electrolyte, whereas high aspect ratio over 3.0 will trigger accumulation of damage in bulk electrolyte. The correction between interfacial defect and electro–chemo–mechanical failure of solid-state electrolyte is expected to provide insightful guidelines for interface design in high-power-density solid-state Li metal batteries.

electro–chemo–mechanics

interfacial defects

solid-state electrolyte

solid-state batteries

mechanical failure

Författare

Yangyang Liu

Xi'an Jiaotong University

Xieyu Xu

Xi'an Jiaotong University

Xingxing Jiao

Xi'an Jiaotong University

Olesya O. Kapitanova

Xi'an Jiaotong University

Zhongxiao Song

Xi'an Jiaotong University

Shizhao Xiong

Chalmers, Fysik, Materialfysik

Advanced Materials

09359648 (ISSN) 15214095 (eISSN)

Vol. 35 24 2301152

Ämneskategorier

Teknisk mekanik

Annan materialteknik

Metallurgi och metalliska material

DOI

10.1002/adma.202301152

PubMed

37060331

Mer information

Senast uppdaterat

2024-03-07