成果報告書詳細
管理番号20120000001211
タイトル*平成20年度~平成21年度のうち平成21年度分中間年報 開発項目「新エネルギー技術研究開発/新エネルギーベンチャー技術革新事業(燃料電池・蓄電池)/有機硫黄ポリマーを用いた高容量電池の研究開発」
公開日2012/12/19
報告書年度2009-2009
委託先名株式会社ポリチオン, 国立大学法人北陸先端科学技術大学院大学
プロジェクト番号P10020
部署名技術開発推進部
和文要約和文要約等以下本編抜粋:[記載項目]
[記載項目]
1. 研究開発の内容及び成果等
(1)概要
平成20 年度フェーズ1で確立した改良合成方法にて正極材ポリマー合成を検討し、蓄電能力で約250mAh/g ( 重量あたり、従来材料との比較)の放電容量を実現がするため、下記の開発項目に取り組んだ。
英文要約Title: New Energy Technology Research Development / New Energy Venture Business Technology Innovation Program ( Fuel Cells and Batteries ) / Development of new cathode electrode materials with higher capacity for lithium-ion batteries
1) Outline and purpose of the project
In the fiscal year of 2009, we have developed the item III “Electrochemical analysis of newly developed organosulfur cathode materials”, the item V “Improvement synthesis for organosulfur polymers”, the item VI “Optimization of lithium cells fabrication”, the item VII “Electrochemical characterization of lithium cells”, the item VIII "Characterization of dynamics of newly developed organosulfur cathode materials", and the item IX "Fabrication and characterization of thin-film cathode electrodes" under the joint project between Polythion Co Ltd. and Japan Advanced Institute of Science and Technology, 
2) Results 1: the item III and the item VII
We have investigated electrochemical characteristics of organosulfur polymers by cyclic voltammetry and by charge-discharge test. Cathods were prepared with those materials/acetylene black/PTFE binders. The cathodes were tested at 0.1 C in a cell with a Li anode, a 1M LiPF6 solution in EC and DEC. A reversible capacity of approximately 250 mA h/g has been found for these compounds during the first few cycles.
3) Results 2: the item V
We have improved the organosulfur polymer synthesis with cost reduction and production time reduction. As a starting material is expensive, we examined on a production cost estimation for the starting material and confirmed that a large-scale production is cost-effective for cost reduction. In the polymer synthesis, we have found the accelerator for the organosulfur polymerization. With the addition of the accelerator, yield improvement within a shorter synthesis time was achieved.
4) Results 3: the item VI
We made prototype lithium secondary batteries with business card size, which were pouch-type cells that were assembled with lithium metal anodes, organosulfur polymer cathodes and 1M LiPF6/EC/DEC electrolyte, and electrode tabs. With the selection of collectors and laminate films and the optimization of sealing method, we could fabricate these cells and demonstrated the performance of lithium-organosulfur polymer batteries.
5) Results 4: the item VIII
Firstly, we have clarified that the organosulfur with disulfide bond shows structural flexibility from detailed analysis of 1H NMR spectroscopy. The information is very important for the understanding and design of organosulfur cathode materials. The result also shows that an in-situ CV and UV-Vis measurement approach is powerful for understanding the dynamics of organosulfur cathode materials during the electrochemical reaction. According to the results, we have developed an in-situ CV and UV-Vis measurement system.
6) Results 5: the item IX
A transparent thin-film cathode electrode is a potential one for both in-situ CV and UV-Vis measurement, and development of higher performance electrodes. Our method is that the developed organosulfur materials are added to the ITO/glass substrate by silane coupling agent. We have fabricated ITO/glass substrate modified with a silane coupling agent. Success in modification by a silane coupling agent was confirmed by the existence of Si 2p signal of XPS spectroscopy, and found that the modified substrate was still transparent.
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