Abstract
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.
Original language | English |
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Article number | 1350040 |
Journal | International Journal of Applied Mechanics |
Volume | 5 |
Issue number | 4 |
DOIs | |
Publication status | Published - 20 Nov 2013 |
Keywords
- concentration gradient
- elastic stiffening
- Lithium-ion battery
- stress field
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering