Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 4, Pages 1128-1136Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta13925e
Keywords
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Funding
- Key Project of Chinese Ministry of Education [211061]
- National Natural Science Foundation of China [10502025, 10872087, 11272143]
- Program for Chinese New Century Excellent Talents in University [NCET-12-0712]
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A sphere dislocation model is developed to describe the effect of dislocation on diffusion-induced stress in battery electrodes. We follow the conventional assumption that the diffusion-induced stresses are symmetrical during intercalation and de-intercalation. The results show that dislocation-induced stress can lower the tensile stress, convert the state of stress from tensile to compressive, and the tendency to fracture can be reduced with decreasing the particle radius down to the nanometer range. We conclude that dislocation mechanics are beneficial to avoid the formation of cracks during cycling. Here, we suggest a possibility of developing a new strategy to optimize the diffusion-induced stresses and prolong battery life.
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