中国中南大学梁叔全 教授及び重慶大学 陳澤軍 教授による講演会を開催します。
日時：平成29年3月8日（水）14:00 – 15:20
講演1(14:00-14:40): 中南大学 材料科学と工程学院長 梁叔全 教授
Prof. Shuquan LIANG, School of Materials Science & Engineering, Central South University, China
High Performance Vanadium-based Nano Materials Cathodes of Li-ion Battery by Micro/nano Structure Controlling and Ion Modification.
Lithiumion batteries (LIBs) were widely used in portable electronic devices, mainly due to their high energy density, good cycle performance and charge retention ability. As a complement or alternative to LIBs, the sodium-ion batteries (NIBs) have attracted worldwide attention because of the market demand for energy storage technology as well as the abundance and low cost of sodium sources. Exploring advanced cathode and anode materials for LIBs and NIBs are urgently desirable. Vanadium-based materials possess relatively high theoretical specific capacity because of their abilities to intercalate more Li+ ions per formula (multistep reductions and more electron transfer). For example, vanadium pentoxide (V2O5) has an ultrahigh theoretical capacity of 442 mA h g−1 when three lithium ions are intercalated, which is much higher than those of commercial cathodes, eg. LiCoO2, LiMn2O4, LiFePO4, and Li(NixCoyMnz)O2, etc. The high theoretical capacity makes them the potential candidates for the future LIBs and NIBs. Especially, in recent two years, Vanadium-based materials as cathode for NIBs are extensively studied. Herein, recent progress in Vanadium-based materials for lithium-ion batteries, sodium-ion batteries will be reviewed and commented. Particularly, the relationship among the crystal structure, synthetic method, and composition on the electrochemical mechanism and properties of some typical Vanadium-based materials will be discussed in detailed. Future perspectives and directions of Vanadium-based materials for high-capacity LIBs and NIBs are put forward based on the theoretical knowledge from reported literatures and our experiment experience.
重慶大学 材料と工程学院院長補佐 陳澤軍 教授
Prof. Zejun CHEN,College of Materials Science and Engineering, Chongqing University, China
Fabrication of Laminated Metal Composite Sheet via Roll Bonding Technology and its Properties
Laminated metal composite (LMC) sheet can combine the properties of different components, and obtained special properties better than single metal. Dissimilar metals (Al/Al alloys, Al/Mg and Al/Ti/Mg etc.) were assembled to fabricate the LMC sheets by using roll bonding technology. The effect of roll bonding parameters on the microstructure and mechanical properties are investigated. The differences of mechanical properties between the constituent metals lead to the non-uniform deformation and individual layer necking. Some effective methods were presented to quantitatively evaluate the individual layer shape and necking of constituent metals. The strength and elongation of LMCS decrease with the increase of variation of individual layer shapes and necking. The strengthening mechanism of LMCs is the recombination action of grain refinement, dislocation, and laminated interfacial strengthening. The coordinated deformation of dissimilar metals and the layer thickness are important in improving the mechanical properties of LMCs consisting of dissimilar metals.
問合せ：東北大学多元物質科学研究所 環境無機材料化学研究分野 殷 (022-217-5597)