成果報告書詳細
管理番号100013786
タイトル*平成20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2009/4/24
報告書年度2008 - 2008
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
部署名燃料電池・水素技術開発部
和文要約以下本編抜粋: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。
英文要約Title:Research and Development of the High Performance Lithium-ion Battery with Post-olivine Cathode Raremetal-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 Raremetal-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 2008th is to achieve the energy density beyond 555 Wh/kg of he positive electrode material. 1. Development of high-performance cathode material:(1) We conducted a study of LiMnPO4 nanoparticles for high performance materials. In the wet synthesis process, the highly dispersed nanoparticles can be synthesized with the size of 5 nm to 10 nm.(2)Although we could not synthesize the single phase of Li2MnPO4F, Na2MnPO4F could be obtained by solid state synthesis method and we succeeded in the first clarifying the cathode properties of carbon coated Na2MnPO4F. 1.5 sodium in 2 sodium of Na2MnPO4F could be reversibly extracted by charge-discharge cycle in quesi-open circuit voltage mode. (3) FeF3 can be synthesized from hydrofluoric acid and nitric acid iron through the wet method. In addition, LiFeF3 could be also synthesized by chmical lithiation with n-Butyl lithium and Li-naphthalene. We checked the FeF3 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 1,700 yen / kg (H20 year target of 5,000 yen/kg). (4) We did measurement by using Differential scanning calorimetry (DSC) to evaluate the heat stability of the fluoridation iron. At over 340 -C, an small exothermic peak could be detected in the sample mixed FeF3 with acetylene black. However, under 340 -C, the FeF3 was found to be stable thermally.2. Electrode materials characterization:(1) In this study, the optimization of slurry was empoyed to examine the FeF3 cathode material. The optimization showed that the capacity increased 20% from that of conventional material. 190 Ah/kg (590 Wh/kg) was confirmed as a result of evaluating discharge capacity. And it is about 80% of the theory capacity and achieved the 2008th year goal, more than 555 Wh/kg. (2) The stable cycle character could be observed until about 100 cycles in charge-discharge cycle test on the coin cell of the FeF3. (3) We did the trial production of the laminating type single cells with using the LiMnPO4 cathode material. From the hot box examination (at 130 -C for 10 minutes) and the nail penetration test, we confirmed that there was no catching fire and burst, and the goal for this year was attained.
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