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 Category |
Grant-in-Aid for JSPS Fellows
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Allocation Type | Single-year Grants |
Section | 国内 |
Research Field |
Fluid engineering
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Research Institution | Chiba University |
Principal Investigator |
王 志龍 千葉大学, 大学院工学研究院, 特別研究員(PD)
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Project Period (FY) |
2017-04-26 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,000,000 (Direct Cost: ¥1,000,000)
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Keywords | Particle dispersion / dielectric / cathode slurry / circle fitting method / equivalent circuit / LIB slurry / EIS / EEC |
Outline of Annual Research Achievements |
I combined both experiment and simulation methods to clarify the dielectric characteristics of LIB slurry. In the experiment, three slurries are extracted from cathode slurry. Meanwhile, cathode slurry is stirred at different rotational speeds. In the simulation, three different models are compared with the experimental slurries. The medium conductivity and particle conductivity are changed. The obtained Nyquist plots are fitted by circle fitting method. The characteristic resistances fitted by the circle fitting method are compared with those fitted by EEC. Meanwhile, the relaxation frequencies fitted by using the circle fitting method are quantitatively compared with those of experiment. Three main conclusions are shown as follows. Firstly, two particle dispersion behaviours which are CB aggregation and CB-bare LiCoO2 particles are able to be obtained in the case of lower n, while another two particle dispersion behaviours which are CB path and CB-coated LiCoO2 particles are able to be obtained in the case of higher n. In dielectric simulation, CB aggregation and CB-bare LiCoO2 particles are verified by lower medium conductivity and lower particle conductivity. CB path and CB-coated LiCoO2 particles are verefied;ed by higher medium conductivity and higher particle conductivity, respectively. However, compared with particle conductivity, medium conductivity plays important roles in determining particle dispersion because medium conductivity has the similar functions as n. Hence, CB path dominates the conductivity of cathode slurry than CB-coated LiCoO2 particles.
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Research Progress Status |
平成30年度が最終年度であるため、記入しない。
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Strategy for Future Research Activity |
平成30年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(8 results)