成果報告書詳細
管理番号20140000000200
タイトル*平成25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2014/5/17
報告書年度2013 - 2013
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The present study has been done in collaboration with AIST, Hitachi Maxell, Honda R&D Co., and Panasonic. This study focused on the following subjects; (i) high capacity positive electrodes, (ii) high capacity negative electrodes possessing longer cycle and storage life, and (iii)formation of highly durable interface between positive electrodes and electrolytes. In this fiscal year, 2013, we have continued the research on high capacity electrode containing sulfide. And we have designed the structure of high capacity negative alloy electrodes . The study on the electrochemical properties of the surface-coated positive electrodes and characterization of them, particularly focusing on the mechanism of the suppression of the degradation for the active materials, has been done in order to achieve highly durable positive electrodes.

(i)high capacity positive electrodes:
In order to develop a high capacity positive electrode, electrode design of sulfur was investigated. In this fiscal year, we have tried to improve the cycle life of the metal sulfides. As a result, it was found that amorphous NbSx (x=3, 4, 5) showed high capacity more than 560 mAh g-1 and average voltage was more than 2.0 V. Cycle life and conductivity of the powder were greatly improved. On the other hand, novel phases of Li-metal-sulfides, Li2TiS3 and Li3NbS4 were found, to have high capacity and good cycleability.

(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.

(iii)formation of highly durable interface between positive electrodes and electrolytes:
In order to reduce and optimize the amount of coating layer on LiNi1/3Mn1/3Co1/3O2 (NCM), sol-gel technique was applied. Al2O3, ZrO2, and so on were chosen for coating materials. Last year it was found that 0.5 wt% of Al2O3 coating was effective to suppress the capacity degradation. Using STEM-EELS, surface structure was precisely analyzed. After cycling, the structure within several nm from the surface was modified for both of coated and uncoated NCM, however, the structure seemed different. In the ZrO2 coating case, the same analysis is now underway.

(iv)Metal-air secondary batteries are promising candidates for next-generation power sources with a high energy density. Reversible air electrodes that participate in both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are essential for the development of electrically rechargeable metal-air batteries. In this fiscal year, the composite air electrodes with perovskite oxide catalysts and conductive supports were tried to be prepared to increase the catalytic activity. Here, antimony doped tin oxide (ATO) was used as a conductive support alternative to carbon. The activity of the composite catalysts of perovskite oxide and ATO which have no activity toward both ORR and OER strongly depends on the activity of perovskite oxide itself. The appropriate perovskite oxide catalysts supported on ATO successfully improve the catalytic activity toward ORR and OER to reach the equal activity to the catalysts supported on carbon.
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