Insight of electro-chemo-mechanical process inside integrated configuration of composite cathode for solid-state batteries
Journal article, 2023

The complicated electro-chemo-mechanical process that occurs inside the composite cathode for solid-state batteries (SSBs), is of first importance to be insighted for the development of SSBs to seek higher energy density. Herein, exampled with layered transition-metal oxide of LiNixCoyMn1-x-yO2 (NCM), an electro-chemo-mechanical model containing electrochemical kinetics, finite-strain constitutive model and cohesive zone model was built to uncover the impact of ionic conductivity and Young's modulus (E) of solid-state electrolyte (SE) on the electro-chemo-mechanical process inside composite cathode and the intergranular failure of single cathode particle. The intergranular failure of NCM particles is powerfully determined by the Young's modulus of SE and the primary particle size, which is postponed by the coarse-primary NCM with soft SE of E=∼2 GPa. Compared with Young's modulus, increasing the ionic conductivity can uniform the distribution of both Li-ion and stress in the whole composite NCM cathode, realizing improved electrochemical performance with larger normalized capacity and lower the interfacial impendence. Hence, high-adequate ionic conductivity of 5 × 10−4 S cm−1 and soft mechanical property of E=∼2 GPa can be proposed as the guideline of SE for great electrochemical performance with prolongated lifespan of composite NCM cathode, paving an avenue to foster the application of SSBs.

Electro-chemo-mechanical model

Composite cathode

Intergranular failure

Solid-state electrolyte

Solid-state batteries

Author

Xingxing Jiao

Xi'an Jiaotong University

Yongjing Wang

Xi'an Jiaotong University

Yaqi Chen

Xi'an Jiaotong University

Jialin Wang

Xi'an Jiaotong University

Shizhao Xiong

Chalmers, Physics, Materials Physics

Zhongxiao Song

Xi'an Jiaotong University

Xieyu Xu

Xi'an Jiaotong University

Yangyang Liu

Xi'an Jiaotong University

Energy Storage Materials

2405-8297 (eISSN)

Vol. 61 102864

Subject Categories

Inorganic Chemistry

Applied Mechanics

Materials Chemistry

Composite Science and Engineering

Condensed Matter Physics

DOI

10.1016/j.ensm.2023.102864

More information

Latest update

7/7/2023 1