成果報告書詳細
管理番号20150000000230
タイトル*平成26年度中間年報 革新型蓄電池先端科学基礎研究事業 革新型蓄電池先端科学基礎研究開発 (6)
公開日2015/5/26
報告書年度2014 - 2014
委託先名学校法人早稲田大学
プロジェクト番号P09012
部署名スマートコミュニティ部
和文要約
英文要約By using ac impedance analysis for LIB, we analyze a status of the LIB. Moreover, we evaluate the trend of the change in the conditions of the electrode, electrolyte, and separator during the degradation of the LIB. Our target is to establish a method for the analysis of status of degradation of the LIB by ac impedance analysis. The purpose of the research in FY2014 was to suggest a protocol of impedance analysis for LIBs without reference electrode as is the same with the advance method of LIB analysis with reference electrode. A slight variationb derived from LIBs manufacturing process was exactly evaluated by ac impedance measurement. Furthermore our developed FFT impedance measurement, which can be used for very low inner impedance batteries, was applied to the LIBs on vehicle. On LC-QTOF/MS analysis was used to check the deteriorated LIBs, and the data of LIB degradation with vinylene carbonate was accumulated. The LIB composed of LiNi1/3Mn1/3Co1/3O2 cathode and graphite cathode was prepared for impedance analysis on one of the advanced LIB sampels.

(1)Several LCO-based LIBs with a capacity variation of 3% were evaluated by impedance analysis. The impedance difference of 12% from average of whole impedance was detected in maximum. The impedance analysis revealed that the difference mostly attributed to the difference of overlapped semi-circles observed at higher than 1 Hz.

(2)For analysis of LIB on vehicles, the Square-Potential Electrochemical Impedance (SP-EIS), which we originally developed, was tested with the LCO-based LIB. Since the impedance response obtained by SC-EIS was close to those obtained by the conventional impedance measurement by using a frequency response analyzer (FRA), the effectiveness of SP-EIS was demonstrated.

(3)A LIB made in our laboratory was evaluated by LC-QTOF/MS to detect the degradation in the LIB in detail. The data on LIBs, which contains vinylene carbonate additive, was accumulated. The data will be analyzed.

(4)As an advanced LIB, the LIB composed of LiNi1/3Mn1/3Co1/3O2 cathode and graphite cathode was prepared. The impedance of the LIB could be measured without any problems, therefore, the pouch cell LIB, composed of LiNi1/3Mn1/3Co1/3O2 cathode and graphite cathode, is established for impedance analysis.

(5)On the LIB with micro reference electrode, the position of the reference electrode in the LIB was re-investigated. As the results, a better position to measure impedance with higher accuracy was revealed. While, the impedance response of the cathode confirmed at high-middle frequency region, suggests the carbon additive effect in the electrode.
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