流变相反应法及非晶复合氧化物功能材料的研究

Under the solid-liquid rheological state, many substances have new reaction properties. The rheological phase reaction method is a process of preparing compounds or materials from solid-liquid rheological mixture. It is a high efficient, economical and green chemical synthesis technology. By means of this method, the nano-materials and non-crystalline function materials are very easy obtained. It is of interest that the single crystal can be obtained by using this method, too..In this work, the organic acid salts, nanosized oxides and composite oxides of tin, zinc and transition metal have been prepared, and the single crystals of many coordinate compounds were obtained. The rheological phase reaction mechanism, and the influence of reactant granule size on the crystal size of product were investigated. It was revealed that in the rheological phase system there is very strong mineralization action, and molecule identification and structural self-assembled function. A new channel is inaugurated for single crystal growth. .The lithium ion storage function of the composite oxides, the relationships of structure stability with microstructure in repeat storage process, storage capacity with material granule size and shape, and the dependence of charge-discharge capacity and cycle stability on the doped element were investigated. The results show that as cathode materials, the charge-discharge specific capacity of non-crystalline nanosized MnO2 amount to 250-300 mA·h/g; the Ca-doped LiNi1-xCoxO2 at electric current 107 mA/g was 191 mAh/g, after 60 cycles with a average fade of 0.34%/cycle. As anode material, the charge-discharge capacity of non-crystalline nanosized ZnSnO3 to 844 mAh/g; CoSnO3 was 1190 mAh/g; the nanosized Co3O4 with grain size about 40 nm was 913 mA·h/g, and after 20 cycles with a fade of 0.1%/cycle. In addition, we discover that the nanosized metal-carbon composites or carbides have more high capacity and excellent cycle stability, which will become to a research hotspot for the future.This study provide important theory gist in order to extend aftertime research field of the rheological phase reaction for the future, and is affluent in reaction theory of inorganic solid state chemistry and synthetic chemistry, and has important significance and practical value for the development of the green energy source materials. The obtained some nanosized composite oxides have excellent applied foreground as active materials of lithium ion battery with high capacity.

利用流变相反应新方法合成一系列具有新型结构的过渡金属有机酸盐配合物及非晶复合氧化物功能材料。表征其微观结构及光、热、电、磁和离子存储功能特性。研究流变相反应的规律、特点和反应机理。探讨反应产物结构与反应物结构之间的关系及其结构组装机制。本项研究对于合成化学、材料科学和绿色能源工业的发展将具有重要科学意义和巨大应用价值。