成果報告書詳細
管理番号20130000000181
タイトル*平成23年度中間年報 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業(燃料電池・蓄電池) 電池の高効率・長寿命化実現のための超微粒ナノ粒子製造と量産化基盤技術開発
公開日2014/5/17
報告書年度2011 - 2011
委託先名合同会社札幌NBT  国立大学法人北海道大学
プロジェクト番号P10020
部署名技術開発推進部
和文要約
英文要約Title:New Energy Venture Business Technology Innovation Program / New Energy Venture Business Technology Innovation Program (fuel cells and batteries) / Development of Basic Technique for Super Nano-Particles and its Production for Realization of Battery with High Efficiency・Longer Life(FY2011-FY2012)Annual Report

[Development nano-particle production system by means of plasma discharge method] In order to realize the Si lithium battery with high efficiency and longer life due to using super-Si nano-particles as cathode materials of the Li-ion battery and storage battery, the basic technique for electrolysis cell design on glow discharge plasma was examined and the cell by which large amount of Si nano-particles can be produced was developed according to results obtained from pre-examination using a small-sized electrolysis cell .The cell design of new electrolysis cell is composed of Pt as anode and cathode, and the cathode is the same materials as that for nano-particle production. When potassium carbonate aqueous solution was used as an electrolyte, with increasing voltage and direct current the temperature of electrolyte rose to about 90℃ due to Joule heat at the cathode and simultaneously H2 gas bubbles were generated around the cathode. When the gas bubbles covered the cathode electrode, plasma discharge occurred between the electrode and aqueous solution. In this discharge process the small melted materials drops fly out as plasma toward electrolyte so that the drop lets are quenched, then solid particles are produced. Si materials are semiconductor, so higher voltage was required to occur the discharge. It was also clarified that when the potassium carbonate as aqueous solution was used, Si nano-particles with 30-50nm were obtained at a voltage of 130V and about 0.1A. However in this case large amount of potassium carbonate were remained as an impurity, but when the electrolysis was carried out using 0.5 mole Li citric acid at 130 V and 0.5 A, very fine Si and SiO nano particles less than 20nm could be produced. Further more it was found that the surface smoothness of Si electrode rod is very important to obtain the sharp size distribution of Si nano-particles. On the other hand, in order to make mass production of Si nano-particles, newly designed electrolysis cell with which mass production of nano-particles can be produced is composed of 16 cathodes of Si rods. It was clarified that it may be possible to produce Si nano-particles with a production rate of a amount of 10kg/month (about 300g/day). [Characterization of nano-particles]: The evaluation of nano-particles size was carried using transmission electron microscopy (TEM) because the obtained particle were very small size less than 20nm. From the TEM observation it was confirmed that Si nano-particle size produced by using the newly developed cell were 10 ~50nm depending on the electrolysis conditions and it was suggested that further smaller Si particles less than 10nm could be made by controlling electrolysis conditions. [Business plan for marketing] : General activities for marketing of Si nano-particle has been done through the contact with companies where Si lithium-ion battery may be used and interested. Also, by making effort to inform the characteristics of Si nano-particles produced by plasma discharge method through a pamphlet by exhibitions events such as international nanotechnology. Furthermore for the request from users the nano-particles is supplying as a sample. Up to now there are many inquiries from companies and researcher.
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