期刊
JAPANESE JOURNAL OF APPLIED PHYSICS
卷 60, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.35848/1347-4065/abf4a1
关键词
Reconstruction; Lithium-ion battery; Current density distribution; Magnetic measurement; Inverse analysis
资金
- NEDO (New Energy and Industrial Technology Development Organization)
This study successfully evaluated the spatial distribution of electric current density by measuring the magnetic field leaking from the lithium-ion battery. The internal state changes associated with cycle deterioration were visualized by identifying the part where electrical conductivity changed, leading to decreased battery capacity inside the lithium-ion battery.
To develop a high-density and long-life lithium-ion battery, a technology is needed that allows non-destructive visualization of the spatial distribution of deteriorated parts after cycle test. In the present study, we measured the distribution of the magnetic field leaking from the lithium-ion battery during its operation. Based on the measurement results, we evaluated the spatial distribution of electric current density that corresponds to the reaction rate of the active material and the ion diffusion rate in the electrolyte solution inside a battery using the electric current reconstruction process. With respect to the changes in the internal state of the lithium-ion battery associated with cycle deterioration, we successfully visualized the part where the electrical conductivity has changed that is the deteriorated part causing the battery capacity to decrease inside the lithium-ion battery.
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