成果報告書詳細
管理番号20130000000490
タイトル*平成24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2014/1/28
報告書年度2012 - 2012
委託先名独立行政法人産業技術総合研究所 日立マクセル株式会社 パナソニック株式会社 株式会社本田技術研究所
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(i) high capacity positive electrodes:
In order to develop a high capacity positive electrode, electrode design of sulfur was investigated. At the same time preparation of several kinds of metal sulfides were carried out. As a result, it was found that amorphous TiSx (x=3 or 4) showed almost theoretical capacity and average voltage was more than 2.0 V. Dissolution of polysulfides into organic electrolyte was not confirmed after cycles. Improvement of power properties and capacity retention of layered Li-excess oxides was also tried to increase a reversible capacity in practical cells. Surface modification using Li-ion conductive materials was focused for this purpose in this fiscal year, and optimization of the conditions for coating and coated materials were advanced.
(ii) high capacity negative electrodes possessing longer cycle and storage life:
Electrode shape and composition strongly affect the cycle-life of Li-alloy electrode. Design of the electrode for Sn and Sn-Cu alloy has been in optimization for increased capacity as an electrode. In order to improve the degradation caused by crack formation, geometric effect on stress inside the electrode was investigated. Mathematical calculations by finite element method using the measured variable parameters provided the information concerning the weakness in each design of electrode, and we focused a few candidate design.
(iii)formation of highly durable interface between positive electrodes and electrolytes:
Mechanochemical coating as a dry process and evaporation-dryness and so-gel coating as a wet process were conducted for LiNi1/3Mn1/3Co1/3O2 (NCM). Al2O3, ZrO2, and so on were chosen for coating materials. It is very important to make clear the degradation mechanism and the detailed structure at the interface for further improvement. Macroscopic cell level analysis was conducted especially at the elevated temperature. And for atomic level analysis, analytical TEM-EDX and EELS study were applied to the positive electrode before/after electrochemical reaction. Using monochromated EELS spectra, Li distribution within the particle containing Co was successfully mapped. Distribution of the reaction was also visualized.
In this fiscal year, the composite air electrodes with metal oxide catalysts and conductive supports were tried to be prepared to increase the catalytic activity. PV (CaxLa1-xCoyFe1-yO3) and carbon black, such as Denkablack, Vulcan XC 72, and Ketjenblack EC600JD were used as an example of catalysts and conductive supports. The ball-milling of PV and carbon powder without any solvent successfully increase the catalytic activity toward both ORR and OER. In addition, Magneli-phase titanium oxide, TiOx was evaluated as a conductive support alternative to carbon. TiOx was durable in 1 - 8 M KOH solution at room temperature for 4 days, and in 8 M KOH solution at 70 °C for 9 hours.
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