Grain size and grain boundary strength: Dominative role in electro-chemo-mechanical failure of polycrystalline solid-state electrolytes
Artikel i vetenskaplig tidskrift, 2024

Solid-state batteries with lithium metal anode have been accepted extensively as the competitive option to fulfill the upping requirement for safe and efficient energy devices. Nevertheless, its wide-ranging application has been impeded by the failure of solid-state electrolyte (SSE) induced by development of lithium (Li) filament. Based on the nature of polycrystalline ceramic SSE with varying grain size and boundary strength, the constitutive equation coupled with electrochemical kinetics was applied to picture the propagation of damage and corresponding disintegration caused by the development of Li filament. Based on the results, we found that the stress generated along with the growth of Li filament spreads away via the opening and sliding of grain boundary. Thus, damage occurs along grain boundaries, of which propagation behavior and damage level are controlled by grain size. Especially, over-refinement and under-refinement of grains of SSE can cause flocculent damage with inordinate damage degree and accelerate the failure time of SSE, respectively. On the other hand, the failure time is powerfully prolongated through strengthening the grain boundary of SSE. Eventually, grain size of 0.2 μm and tensile strength of grain boundary of 0.8-time-of-grain are posted as the threshold to realize the postponed failure of NASICON-based SSE. Inspiringly, electro-chemo-mechanical model in this contribution is generally applicable to other type of ceramic SSE to reveal the failure process and provide the design guideline, fostering the improvement of solid-state batteries.

Strength of grain boundary

Electro-chemo-mechanical failure

Polycrystalline solid-state electrolyte

Lithium metal anode

Grain size

Författare

Xingxing Jiao

Southwest Jiaotong University

Yongjing Wang

Xi'an Jiaotong University

Olesya O. Kapitanova

Xi'an Jiaotong University

Pavel V. Evdokimov

Shenzhen MSU-BIT University

Shizhao Xiong

Chalmers, Fysik, Materialfysik

Zhongxiao Song

Xi'an Jiaotong University

Valentyn S. Volkov

Emerging Technologies Research Center

Valery I. Putlayev

Shenzhen MSU-BIT University

Xieyu Xu

Xi'an Jiaotong University

Yangyang Liu

Xi'an Jiaotong University

Energy Storage Materials

2405-8297 (eISSN)

Vol. 65 103171

Drivkrafter

Hållbar utveckling

Ämneskategorier

Teknisk mekanik

Annan elektroteknik och elektronik

Styrkeområden

Energi

DOI

10.1016/j.ensm.2023.103171

Mer information

Senast uppdaterat

2024-01-26