Effects of concentration-dependent elastic modulus on Li-ions diffusion and diffusion-induced stresses in spherical composition-gradient electrodes

2015 ◽  
Vol 118 (10) ◽  
pp. 105102 ◽  
Author(s):  
Kai Zhang ◽  
Yong Li ◽  
Bailin Zheng
Keyword(s):  
Elastic Modulus ◽  
Composition Gradient ◽  
Induced Stresses ◽  
And Diffusion

Effect of Irreversible Electrochemical Reaction on Diffusion and Diffusion-Induced Stresses in Spherical Composition–Gradient Electrodes

2019 ◽  
Vol 75 (1) ◽  
pp. 55-63
Author(s):  
Kai Zhang ◽  
Bailin Zheng
Keyword(s):  
Electrochemical Reaction ◽  
Composition Gradient ◽  
Electrochemical Performances ◽  
Transition Form ◽  
Capacity Fading ◽  
Induced Stresses ◽  
The Difference ◽  
And Diffusion ◽  
Positive Effect ◽  
Heterogeneous Factor

AbstractComposition–gradient electrodes have been proved to have excellent electrochemical performances. The effect of irreversible electrochemical reaction on diffusion and diffusion-induced stresses in such electrodes is investigated. The diffusion equation and mechanical equation considering the electrochemical reaction and the heterogeneous factors are derived, and the distributions of lithium (Li) concentration and stresses in a spherical electrode are obtained under potentiostatic charging. The results indicate that the electrochemical reaction will slow down the diffusion process and enhance the stresses of the electrode. However, the heterogeneous factors of the electrochemical reaction could provide a positive effect on the stresses, which means that the heterogeneous factor is conducive to avoid capacity fading of the battery. The results suggest that the composition–gradient electrodes could be designed to have a decreasing transition form of forward reaction rate and an increasing transition form of the difference of atomic volume between reactants and the reaction product.

Thermal and diffusion‐induced stresses in crystalline solids

1995 ◽  
Vol 77 (1) ◽  
pp. 127-134 ◽  
Author(s):  
I. V. Belova ◽  
G. E. Murch
Keyword(s):  
Crystalline Solids ◽  
Induced Stresses ◽  
And Diffusion

Analysis and Measurement of Volume Change by Transformation of Crystal Between Hf and HfOx Thin Film During Oxidation Using Nanoindenter

2015 ◽  
Vol 15 (10) ◽  
pp. 7593-7597
Author(s):  
Myung Joon Park ◽  
Soo In Kim ◽  
Chang Woo Lee
Keyword(s):  
Thin Film ◽  
Crystal Structure ◽  
Elastic Modulus ◽  
Annealing Temperature ◽  
Surface Hardness ◽  
Surface Oxidation ◽  
Analysis Method ◽  
Monoclinic Crystal ◽  
Nanomechanical Properties ◽  
Induced Stresses

In this study, nanomechanical properties were analyzed using a nanotribology method. The nanoindenter system is the main analysis method in nanotribology. The nanoindenter can measure the induced stresses, elastic modulus, and stabilities of Hf and HfO2 thin film surfaces as a function of the annealing temperature. The surface hardness and elastic modulus decreased, except at 600 °C, from 8.1 to 6.22 GPa and from 143.87 to 93.68 GPa, respectively, as the annealing temperature was increased from the as-deposited state to 800 °C. These results were related to the surface oxidation of the Hf thin film or the formation of a HfO2 monoclinic crystal. The change in the crystal structure caused an increase in volume that subsequently induced a compressive stress.

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