Research on the mechanism of electro-mechanical coupling expansion behavior in all-solid-state lithium metal batteries

doi:10.19799/j.cnki.2095-4239.2025.0271

Abstract

Abstract:

To address the instability of the internal solid-solid interfaces in all-solid-state lithium metal batteries caused by the expansion behavior, which leads to poor cyclability, this study examines the effect of the stack pressure on the electrode and solid electrolyte (SE) contact. A two-dimensional axisymmetric force–electric coupling homogeneous battery model was developed using NCM811, Li₆PS₅Cl, and lithium metal as the cathode, SE, and anode, respectively. The model was constrained to its initial state during the charge-discharge cycles to analyze the factors influencing the internal expansion forces. The results show that lowering the cathode's Young's modulus effectively mitigates the fluctuation in the expansion force. Specifically, a cathode with a Young's modulus of 300 MPa reduced the maximum expansion force to 2.89 MPa, with a peak stress of 12.5 MPa. Adjusting the lithium metal anode thickness (20—200 µm) helps alleviate the volume strain at the SE-anode interface by enabling the deformation of the lithium metal, thereby reducing the anode volume strain and charging-induced swelling stress. These findings highlight the key factors affecting the internal expansion forces and provide design strategies for improving the next-generation ASSLMB performance.

Key words: all-solid-state lithium metal batteries, battery expansion, electro-mechanical coupling, multiphysics model, anode volumetric strain

CLC Number:

TM 912

Menghui HAN, Hua ZHANG, Jing WU, Xinrui SUN. Research on the mechanism of electro-mechanical coupling expansion behavior in all-solid-state lithium metal batteries[J]. Energy Storage Science and Technology, 2025, 14(10): 4009-4019.

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参数	符号	数值	参考文献
正极杨氏模量	E_cat	720 MPa	[34]
SE杨氏模量	E_SE	22.1 GPa	[35]
锂金属密度	ρ_Li	534 kg/m³	[36]
锂金属摩尔质量	M_Li	6.94 kg/mol	—
锂初始屈服应力	σ_ys0	2 MPa	[37]
锂各向同性切线模量	E_Tiso	10 MPa	[37]
负极电荷转移系数	α_a	0.5	—
正极电荷转移系数	α_c	0.5	—
正极初始浓度	c_s,0	49970 mol/m³	—
正极最大锂离子浓度	c_s,max	50060 mol/m³	—
固态电解质电导率	k_l	0.39 S/m	[38]
正极厚度	L_cat	50 μm	—
电解质厚度	L_se	20 μm	—
负极厚度	L_an	50 μm	—
电池半径	R_cell	150 μm	—