期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 46, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/46/10/105307
关键词
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资金
- National Science Foundation of China [11102103, 11172159]
- Shanghai Municipal Education Commission, China [13ZZ070]
- Research Fund for the Doctoral Program of Higher Education of China [20113108120006]
- Science and Technology Commission of Shanghai Municipality, China [12ZR1410200]
This work investigates the stress-assisted diffusion of lithium ions in layered electrodes of Li-ion batteries. Decoupled diffusion governing equations are obtained. Material properties, which are characterized by a single dimensionless parameter, and mechanical constraint between a current collector and an active layer, which is characterized by the elastic modulus ratio and thickness ratio between the layers, are identified as key factors that govern the stress-assisted diffusion. For a symmetric plate electrode, stress is induced by the Li-ion concentration gradient, and stress-assisted diffusion therefore depends only on the material properties. For an asymmetric bilayer electrode, mechanical constraint plays a very important role in the diffusion via generation of bending stress. Diffusion may be facilitated, or inversely impeded, according to the constraint. By summarizing the coupling factors of common active materials and investigating the concentration variation induced by stress-assisted diffusion in various electrodes, this work provides insights on stress-assisted diffusion in a layered electrode, as well as suggestions for relevant modelling works on whether the stress-assisted diffusion should be taken into account according to the selection of material and structure.
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