成果報告書詳細
管理番号20130000000168
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) リチウムイオン電池用酸化物負極材料の技術開発
公開日2013/11/20
報告書年度2011 - 2011
委託先名株式会社ナノリサーチ 国立大学法人福井大学
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 Cell and Batteries ) / Research and Development of Oxide Anode Materials for Lithium Ion Battery (FY2011-FY2012) FY2011 Annual Report

Recently, the large scale lithium ion batteries (LiB) are expected as the energy storage for electric vehicles, hybrid electric vehicles and energy storage applications. However, some accidents such as thermal runaways have occurred. Therefore, safety concerns have become the main focus for research and development of the large scale LiB. Furthermore, the high rate performance of LiB has been required. Oxide anode material is expected because of better safety. Spinel lithium titanate (LTO) has many advantages compared to the currently used graphite as anode material. It is a zero strain lithium insertion material in the charge/discharge process. It does not form a solid electrolyte interface based on solvent reduction. These advantages will be a favorable property for the high rate performance. However, the low conductivity of LTO led to initial capacity loss and poor rate performance. The particle size, morphology and electronic conductivity are among the most important factors to the high rate performance. The aim of this work is development of LTO/C nanoparticles as oxide anode materials and is to start a business of oxide anode materials.
In this research, LTO/C nanoparticles were prepared by spray pyrolysis using a pulse combustion technique. Furthermore, the production system of LTO/C nanoparticles was developed. This apparatus consisted of the aerosol generation unit, the pulse engine system, the pyrolysis furnace with hot air and the powder collector. Aerosol was continuously generated by two-fluid nozzle and was introduced into the pulse impact wave. Furthermore, aerosol was uniformly pyrolyzed from 400 °C to 500 °C in the pyrolysis furnace. Finally, LTO/C nanoparticles were collected by the powder collector using the bag filter. The yield of LTO/C nanoparticles was 100 g/hr. XRD analysis showed that the diffraction patterns of LTO/C nanoparticles were good agreement with spinel phase. SEM observation showed that LTO/C nanoparticles had irregular shaped morphology with the average size of 100 nm. The rechargeable capacity of LTO/C nanoparticles was 170 mAh/g at 1 C. The initial discharge capacity of LTO/C nanoparticles was also 160 mAh/g at 10 C. After 1000 cycles, the discharge capacity of LTO/C nanoparticles was 90 % of the initial discharge capacity. It was confirmed that LTO/C nanoparticles had the excellent high rate performance and cycle stability. We will supply LTO/C nanoparticles for the company of lithium ion cell since 2014.
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