| Project/Area Number |
10650818
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
工業物理化学
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| Research Institution | TOKYO INSTITUTE OF POLYTECHNICS |
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Principal Investigator |
SASAKI Yukio Professor, Tokyo Institute of Polytechnics, 工学部, 教授 (20064280)
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| Co-Investigator(Kenkyū-buntansha) |
NANBU Noritoshi Assistant, Tokyo Institute of Polytechnics, 工学部, 助手 (40329214)
HANDA Minoru Lecturer, Tokyo Institute of Polytechnics, 工学部, 講師 (70247328)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Lithium Batteries / Organic Electrolyte / Scanning Electron Microscope / Sydnone Compounds / Conductivity / X-ray Photoelectron Spectroscope / Cycling Efficiency / リチウム一次、二次電池 / エネルギー密度 / リチウム一次,二次電池 / リチウムサイクル効率 / 混合溶媒 / リチウム1次,二次電池 / 誘電率 / 粘性率 |
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| Research Abstract |
The electrolytic conductivity and charge-discharge characteristics of the lithium electrode were examined in the ternary solvent systems made up of ethylene carbonate (EC)-dimethylcarbonate (DMC) equimolar binary mixture with 3-mehylsydnone (3-MSD) and 3-ethylsydnone (3-ESD). The electrolytes used are LiClO_4, LiPF_6, LiBF_4, LiCF_3SO_3, LiN(CF_3SO_2)_2, and LiN(C_2F_5SO_2)_2. The order of the decrease in conductivities of ternary solvent electrolytes at mol ratio 0.5 of 3-MSD and 3-ESD is LiPF_6>LiClO_4>LiN(CF_3SO_2)_2 and LiN(C_2F_5SO_2)_2>LiBF_4>LiCF_3SO_3. The 1 mol dm^<-3> LiN(CF_3SO_2)_2 and LiN(C_2F_5SO_2)_2 electrolytes with large anions show the moderate conductivities of more than 6-7 mS cm^<-1> at mol ratio 0.5 of 3-MSD and 3-ESD.An addition of 3-MSD and 3-ESD to the EC-DMC equimolar binary mixture containing LiClO_4, LiBF_4, LiCF_3SO_3, and LiN(CF_3SO_2) is effective for the rise in lithium electrode cycling efficiency. It is found by using scanning electron microscope (SEM) that the cycling efficiency is dependent on the morphology and thickness of the film formed on the Ni (working) electrode. In addition, the film was found to be containing a certain nitrogen compound by using X-ray photoelectron spectroscope (XPS).
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