Improvement of electronic conductivities by nao-junction interface control and its application to cathode materials of rechargeable lithium batteries

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360405
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Energy engineering
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: TANIGUCHI Izumi 東京工業大学, 理工学研究科, 准教授 (00217126)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: リチウム二次電池 / 正極材料 / ナノ構造材料 / 珪酸マンガンリチウム / 珪酸鉄リチウム / 噴霧熱分解法 / ナノ複合化 / ピロ燐酸鉄リチウム

Outline of Final Research Achievements

Synthesis of Li2MSiO4 and Li2MP2O7 (M=Fe and Mn) was carried out from a combination of low temperature spray pyrolysis and ball-milling at various synthesis conditions, such as spray pyrolysis temperatures, synthesis atmospheres, annealing temperatures, ball-milling times rotational speeds and milling times. The effect of process conditions on their physical and electrochemical properties was discussed. Field-emission scanning electron microscopy and transmission electron microscopy with energy-dispersive spectroscopy verified that the final samples are agglomerates of Li2MSiO4 or Li2MP2O7 primary particles with less than 100 nm and that the carbon was well-distributed on the surface of the agglomerates. Li2MSiO4/C or Li2MP2O7 nanocomposite samples were used as an electrode material for rechargeable lithium batteries, and electrochemical measurements were carried out at room temperature. These cells showed good electrochemical properties.

Free Research Field

化学工学