2017 Fiscal Year Annual Research Report
The development of the impedance spectroscopy method to measure the particle dispersion degree in Lithium-ion battery (LIB) slurry
| Project/Area Number |
17J03249
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| Research Institution | Chiba University |
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Principal Investigator |
王 志龍 千葉大学, 工学研究科, 特別研究員(DC2)
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| Project Period (FY) |
2017-04-26 – 2019-03-31
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| Keywords | LIB slurry / EIS / EEC |
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| Outline of Annual Research Achievements |
In terms of Lithium-ion battery (LIB) slurry, many experimental and analytical methods have been utilized to characterize the properties of LIB slurry. The research achievements are almost same with my expected one. Specifically, a 10-parameter electrical equivalent circuit (EEC) has been successfully proposed to evaluate the electrochemical characterizations of LIB slurry under off-line static conditions. This research achievement has been published on Journal of The Electrochemical Society. In addition, the morphological structure characterizations in LIB slurry has also been successfully clarified under shear rotational conditions by on-line dynamic Electrochemical Impedance Spectroscopy (EIS) method. This research achievement has also been published on Journal of The Electrochemical Society. Both of the former and the latter achievements contribute to the clarification of particle agglomeration and dispersion mechanism. The preliminary conclusions are shown that it is not LiCoO2 particle but Carbon Black (CB) particles that dispersed in LIB slurry with the increase of rotation speed. In this regard, strategies for improving the performance of LIB will be proposed in future.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
As for my previous research proposal, a method to evaluate the characterizations of Lithium-ion battery (LIB) slurry will be proposed. Based on this proposal, a 10-parameter electrical equivalent circuit (LIB) has been proposed to quantitatively evaluate the electrochemical characterizations of LIB slurry. The results show that my proposed 10-parameter EEC has higher accuracy than an old 8-parameter EEC. In addition, based on this 10-parameter EEC, an on-line dynamic morphological characterizations of LIB slurry under different rotation speeds have also been analyzed. Thus, four different morphological structure corresponding to each rotation speed has been proposed.
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| Strategy for Future Research Activity |
In future, electrical impedance spectroscopy (EIT) and electrical impedance spectroscopy (EIS) will be combined to investigate Lithium-ion battery (LIB) slurry. In EIT, the conductivity and permitivity distribution images of LIB slurry under different rotation speed with different components will be obtained by reconstructed algorithm. In EIS, both experiment and simulation methods will be considered to have an insight into the electrochemical mechanism of LIB slurry. As a result, a real-time on-line evaluation method to evaluate particle distribution behaviors in LIB slurry will be proposed.
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