期刊
JOURNAL OF POWER SOURCES
卷 242, 期 -, 页码 415-420出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.05.098
关键词
Diffusion-induced stresses; Lithium-ion battery; Pre-strain; Electrode-collector structure
资金
- Natural Science Foundation of China [11090330, 11090331, 11072003]
- Special Funds for the Major State Basic Research Program of China [2010CB832701]
Diffusion-induced stresses can break structure integrity of electrodes, and further degrade storage capacity and cycling stability of lithium-ion batteries. To reduce these built-in stresses due to lithium-ion diffusion, we report a strategy of pre-strain applied to the structure of active electrode film bonded to the current collector. Accordingly, a model is developed for the effect of pre-strain on mechanical stress of the electrode-collector structure. The theoretical results show that pre-strain greatly alleviates diffusion-induced stresses of electrode film and current collector, especially stress drop at the electrode -collector interface. In addition, tensile stresses of two electrode surfaces should be modestly tuned by pre-strain, avoiding brittle fracture. (C) 2013 Elsevier B.V. All rights reserved.
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