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成果報告書詳細
管理番号20190000000487
タイトル*平成30年度中間年報 NEDO先導研究プログラム/エネルギー・環境新技術先導研究プログラム/劣化フリー蓄電池実現のための溶媒和制御型電解液の研究開発
公開日2019/5/31
報告書年度2018 - 2018
委託先名学校法人同志社 同志社大学
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約LiNi0.5Co0.2Mn0.3O2 positive electrodes can deliver a high specific capacity of ca. 200 mAh g-1 by charging to 4.6 V. However, the severe decomposition of conventional electrolyte solutions is a problem at such a high potential. The stability of electrolyte solutions against oxidation can be improved by increasing concentration, but there are three major problems to be solved toward the practical use; 1) high concentration, 2) high viscosity, and 3) low ionic conductivity. These problems can be settled by diluting the highly concentrated electrolyte solutions with appropriate diluents. The target of this project is to develop a novel electrolyte solution which can deliver 200 mAh g-1 corresponding to 98.5 % of the initial capacity at the 100th cycle. In this year, nearly concentrated LiBF4/DMC+TFEP electrolyte solution was diluted with TFEC. In the resultant electrolyte solution, the initial discharge capacity of LiNi0.5Co0.2Mn0.3O2 electrodes reached 204 mAh g-1 and 98.4% of it was retained even at 50th cycle. Thus, the degradation of NCM electrode was extremely suppressed even though the upper cut-off voltage was as high as 4.6 V. The present electrolyte solution has a low viscosity, moderate lithium salt concentration, and high stability against oxidation, and is therefore very promising for high-voltage operation of LIBs.
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