成果報告書詳細
管理番号20150000000229
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 (5)
公開日2015/5/26
報告書年度2014 - 2014
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. The goal of this study is to indicate concepts for innovatively improving methods for positive and negative electrode materials in order to achieve breakthroughs of lithium-ion and post lithium-ion cell performance, durability and reliability. This study focused on the following subjects; (i) high capacity positive electrodes, (ii) high capacity negative electrodes possessing longer cycle and storage life, (iii)formation of highly durable interface between positive electrodes and electrolytes and (iv)Zinc-air secondary batteries. In this fiscal year, 2014, 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. In addition, electrode reaction and degradation mechanisms of high voltage positive electrodes at elevated temperature were also investigated.
(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 and capacity of the metal sulfides by optimizing the metal and dopant. Moreover charge-discharge mechanism was studied. Li-rich and Li-poor oxides were also developed.
(ii) high capacity negative electrodes possessing longer cycle and storage life: design of the electrode for Sn and Si was optimized. For Si, high capacity of more than 2500 mAh/g-Si was obtained. Further optimization of electrode is underway.
(iii)formation of highly durable interface between positive electrodes and electrolytes: in order to clarify the mechanism of improvement by coating, Zr-oxide coating layer on LiNi1/3Mn1/3Co1/3O2 (NCM) was formed by sol-gel and surface was intensively studied using STEM-EELS. Using the series of Zr oxide-coated samples, surface coverage and favorable morphology of deposit was optimized.
(iv)Zinc-air secondary batteries: Reversible air-electrodes catalyzing both oxygen reduction and evolution reactions are required for developing zinc-air secondary batteries. Although carbon black is widely used as a catalyst support, which is mixed with bi-functional catalysts such as perovskite-type oxide, it is potentially oxidized during the charging step. In this fiscal year, antimony doped tin oxide (ATO) is used as a conductive support alternative to carbon to evaluate both activity and durability of air electrodes in zinc-air secondary batteries with perovskite-type oxide catalysts. The ATO support shows improved durability toward charge-discharge cycles compared to the carbon support.
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