成果報告書詳細
管理番号20110000001407
タイトル*平成22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2012/6/27
報告書年度2010 - 2010
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
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 目的 本事業は,直流作動の電気化学デバイスにおいて系を大きく乱すことなく作動中および待機中に測定が可能な交流インピーダンス法を用いてLIB 電池内部状態評価解析を行い,劣化要因推測のための評価解析法の提案を目的とする.電気化学反応のインピーダンス応答の解析により電極合剤層内電子伝導,電極/電解質界面に存在するSEI(Solid Electrolyte Interface)層のイオン抵抗と電荷移動抵抗,電解質イオン移動抵抗を各界面および層の容量値を一つの判断基準として,全電池インピーダンスの解析につなげる.これらの検討をもとにLIB の劣化の要因を電気化学的パラメータから明示する.
平成22 年度は,LIB 作製装置を使用して市販の1/2 程度の容量を有するLIB を作製し,破壊検査による表面形状・組成評価が可能なことを確認して,破壊検査による電極の劣化挙動の解析が可能なことを確認する.また,ラボ作製LIB へ参照極を導入する手法の検討を確立させ,インピーダンス測定を行うとともに,インピーダンスを分割評価する方法を検討する.LIB の劣化機構を明らかにするために,劣化試料に対してインピーダンス評価を行う.特に劣化加速充放電装置により劣化速度を加速させてインピーダンス測定に供するLIB 試料の作製し,劣化状態の推測を実現させる.
英文要約Title: R & D Initiative for Scientific Innovation of Next Generation Battery / Durability Analysis of Li-ion Batteries using in-situ Impedance Method
(FY2009-2011)FY2010 Annual Report
Tetsuya Osaka, Waseda University
This research aims at the R & D Initiative for Scientific Innovation of Next Generation Battery / Durability Analysis of Li-ion Batteries using in-situ Impedance Method. Using Ac impedance analysis for LIB, we research analysis of the status of the LIB. Moreover, we evaluate the trend of the change in the condition of the electrode, electrolyte, and separator during the degradation of the LIB. Our research is establishment of method for the analysis method of status of degradation of the LIB by Ac impedance analysis.
The purpose of the research in Fy2010 was to develop of multi-laminated LIB with by our fabrication systems. Moreover, Ac impedance analysis was also investigated for basic research for our laminated LIB with reference electrode and LIB in commercial use.
First, we developed multi-laminated LIB. The over 50mAh of capacity was expected in fabricated one cell of LIB, and we could be able to investigate high-capacity and/or high-rate charge-discharge experiment in lab-level. Moreover, method of surface analysis of electrode in laminated LIB could be realized by SEM and FT-IR.
Second, thin laminated LIB with reference electrode was fabricated. Li, Li-Sn, Li-Al, Ag, and Pt were used for reference electrode. Li, Li-Sn, and Li-Al show a constant potential in the cell as reference electrode. This LIB was confirmed to an application possibility by AC impedance analysis. The dispersion of impedance data over the frequency range between 100kHz and 10mHz comprises an inductive part and capacitive parts. The data obtained at several SOC values of the cell analyzed by an equivalent circuit of fitting procedure. The presence of depressed semicircles in the capacitive region of the Nyquist plots necessitated the use of an electrical equivalent circuit containing constant phase elements. By using reference electrode, we could separately analyze both anode and cathode.
Final, conditions of commercial LIB with capacity of 5Ah, 3.6Ah and 0.83Ah was confirmed by AC impedance analysis. The LIB with calendar capacity loss and/or cycle capacity loss was prepared, and was analyzed by AC impedance method. We could successfully obtain the loss of the electrodes by using AC impedance analysis under acceleration conditions during only 30 days.
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