کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1286080 | 1497942 | 2015 | 9 صفحه PDF | دانلود رایگان |
• Failure modes are analyzed for core–shell structural active materials.
• Diffusion-induced stress field is calculated based on an elastic–plastic model.
• The 3D phase diagrams for avoiding fracture and debonding are determined.
Although they may improve the electrochemical performance of lithium-ion batteries, core–shell structural anode materials with high-capacity suffer from large volume expansion and dissolution during lithium-ion intercalation/extraction. To well understand these problems, failure modes are analyzed in core–shell structural active materials of a lithium-ion battery during the lithiation–delithiation process. Taking into account the lithium-ion concentration distribution along the direction of radius, the diffusion-induced stress field is calculated according to a perfectly elastic–plastic model. Based on the strain energy release rate, the critical sizes of core and shell for avoiding surface fracture and interface debonding are determined as a function of the state of charge. Furthermore, the three-dimensional phase diagram is constructed to demonstrate the relationship between the shell thickness, the outer radius of core, and the ratio of outer and inner radii.
Journal: Journal of Power Sources - Volume 290, 20 September 2015, Pages 114–122