成果報告書詳細
管理番号20120000000309
タイトル*平成23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 5
公開日2012/6/27
報告書年度2011 - 2011
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及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戦地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。
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)FY2011 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 Fy2011 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.
(1) The rate property of the single LIB assembled in our laboratory was successfully improved by optimizing electron conductive additives. The improved electrodes will be stacked in the LIB.
(2) Laminated LIB with a micro reference electrode was analyzed by means of ac impedance measurement for further understanding of the degradation process along with charge-discharge cycles. A micro-sized Li-Al alloy was used as the reference electrode not to affect the current distribution in the battery. Separated impedances that are anode impedance and cathode impedance versus the reference electrode in various state of charge are successfully obtained and analyzed with equivalent circuits. The impedance analysis on cycled battery was discussed.
(3) Electrochemical impedance spectroscopy was applied to the analysis of the state of electrode in commercial LIBs. The impedance spectrum was analyzed at various states of charge before and after charge?discharge cycles. The measured impedance was interpreted based on the equivalent circuit, in which the inductive component, SEI, the anode component and the cathode component is composed of elements corresponding to two different particle sizes. The impedance values corresponding to both cathode and anode were obtained by a fitting technique, which showed the validity of the equivalent circuit for interpret the cause of capacity degradation of LIB. In addition, the LIB with capacity fading at 60 oC was prepared. We could successfully obtain the loss of the electrodes by using AC impedance analysis under acceleration conditions during only 30 days.
(4) Microstructure of Electrodeposited SiOC composite anode with high capacity and high cycle performance for Li secondary battery was analyzed by STEM. As-deposited Si anode showed amorphous state and homogeneous composition. After lithiation-delithiation, the anode show marbled two phases with amorphous state. One phase was Li-rich phase and the other was Si-O rich phase. After 100th discharge, the anode show similar marbled two phases with amorphous state. It is indicated that this microstructure is one of the reason for showing high capacity and high cycle performance for Li secondary battery. The impedance analysis of SiOC anode has been started.
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