成果報告書詳細
管理番号20110000000706
タイトル*平成22年度中間年報 次世代自動車用高性能蓄電システム技術開発 要素技術開発 ポスト鉄オリビン系高性能リチウム二次電池の研究開発
公開日2012/4/6
報告書年度2010 - 2010
委託先名三菱重工業株式会社 国立大学法人九州大学 九州電力株式会社
プロジェクト番号P07001
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 (1) 正極材料高性能化及び安全性評価(九州大学、三菱重工業) 次世代リチウム二次電池の正極材料として、現時点で経済性と安全性に関して最も有力視されている材料はオリビン系リン酸鉄であるが、エネルギー密度向上とレート特性の改善が課題である。本研究ではエネルギー密度800 Wh/kg(H22年度目標値)を凌ぐ新規正極活物質としてオリビン系リン酸鉄に置き換わりうる安価安全な次世代正極候補として以下の新規材料開発を行った。また、新規高性能材料の材料製造方法の開発について材料コストと量産時のコスト試算と合成実験を実施した。
(1)-a4 正極材料開発(材料特性向上) (九州大学) オリビン系リン酸鉄を凌ぐエネルギー密度を有する正極候補として、(a)フッ化物であるMF3系、ポリアニオンであり材料中にアルカリ金属を2つ含む系である(b)Li2MPO4F系、(c) Li2MSiO4
系に絞り込み、材料合成、材料改良、電気化学的特性の取得などを行った。(各
候補材料の重量エネルギー密度の比較を図1に示した。)
英文要約Title:Research and Development of the High Performance Lithium-ion Battery with Post-olivine Cathode (FY2007-FY2011) FY2010 Annual Report
Rare metal-free polyanionic cathodes such as olivine LiFePO4 are promising cathode active material group for EV due to the low cost, low environmental impact and the high thermal stability. Although LiFePO4 has the highest energy density of 170 Ah/kg in this group, it is not enough to realize the 200 Wh/kg per cell module which is NEDO’s final target at 2015. This project is aimed to find a new Rare metal-free cathode with higher energy density than that of LiFePO4 and improve the rate capability and cyclability by optimization of the powder synthesis, cathode coating, and cell fabrication process. Our final goal in 2010th is to achieve the energy density beyond 800 Wh/kg of he positive electrode material.
1. Development of high-performance cathode material:
(1) FeF3 material could get electric capacity for the maximum 3 electron by changing electric discharge electric potential to the low electric potential side. There was no capacity deterioration as a result examined about the preservation character of this material though it was kept in the state of charge and the state of discharge in 25℃ for 1 month.
(2)It succeeded in the composition of the LiNaFePO4F of the space group Pnma by anneal treatment with this material in the world for the first time. Performance improved to 235mAh/g (the number of 1.76 electrons) by examining the electrode material mixed ratio of this material, controlled the charge potential and discharge potential.
(3) It confirmed that FeF3 could be chemically reduced by cheap lithium oxalic acid. We checked the LiFeF3 commercial material price in the present industry to estimate the price under mass production. As a result, the price of iron fluoride is estimated to be about 1,300 yen / kg (H22 year target of 3,000 yen/kg).
2. Electrode materials characterization:
(1) In this study, the optimization of slurry was employed to examine the LiFeF3 cathode material. 208 Ah/kg was confirmed as a result of evaluating charge capacity in the coin cell which moved the carbon anode to the counter electrodes.
(2) A result of a charge and discharge cycle tests of the coin cell which this material was used for improved to 80% of the capacity maintenance rates at about 50 cycles.
(3) We did the trial production of the laminating type single cells (1Ah class) with using the LiFeF3 cathode material. From the nail penetration test and over-charge and over-discharge tests, we confirmed that there was no catching fire and burst, and the goal for this year was attained.
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