THE EFFECTS OF ELASTIC STIFFENING ON THE EVOLUTION OF THE STRESS FIELD WITHIN A SPHERICAL ELECTRODE PARTICLE OF LITHIUM-ION BATTERIES

被引:43
作者
Zhou, Wenbin [1 ]
Hao, Feng [2 ]
Fang, Daining [1 ,2 ]
机构
[1] Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst LTCS, Beijing 100871, Peoples R China
[2] Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China
关键词
Lithium-ion battery; stress field; concentration gradient; elastic stiffening; DIFFUSION-INDUCED STRESS; CHARGE; SIZE;
D O I
10.1142/S1758825113500403
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Poor cyclic performance of lithium-ion batteries is calling for efforts to study its capacity attenuation mechanism. The internal stress field produced in the lithium-ion battery during its charging and discharging process is a major factor for its capacity attenuation, research on it appears especially important. We established an electrochemical-mechanical coupling model with the consideration of the influence of elastic stiffening on diffusion for graphite anode materials. The results show that the inner stress field strongly depends on the lithium-ion concentration field, greater concentration gradients lead to greater stresses. The evolution of the stress field is similar to that of the concentration gradient but lags behind it, which shows hysteresis phenomenon. Elastic stiffening can lower the concentration gradient and increase elastic modulus, which are two major factors influencing the inner stress field. We conclude that the latter is more dominant compared to the former, and elastic stiffening acts to increasing the internal stress.
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页数:16
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