演 講 人：
國立清華大學材料科學工程學系 陳翰儀 教授  

演講題目： 
Advanced Materials for Lithium and Sodium Ion Batteries

演講時間：
115.06.01上午10點20分~12點10分  

                                          
演講地點：博雅館102室

演講摘要：

Lithium-ion batteries (LIBs) have been widely adopted in portable electronics and electric vehicles due to their high energy density. However, concerns over limited lithium resources, high costs, and safety issues motivate the development of alternative battery technologies. Sodium-ion batteries (NIBs), owing to their abundant resources and lower cost, have emerged as promising candidates for large-scale energy storage. This talk presents a series of advanced materials designed for both LIBs and NIBs, focusing on high-entropy oxides (HEOs), solid electrolytes, and bimetallic chalcogenides.

High-entropy oxides, containing five or more cations, offer enhanced structural stability and tunable electrochemical properties. A spinel-type HEO anode demonstrated high capacity and excellent cycling stability in LIBs. For NIBs, a layered O3-type high-entropy cathode delivered stable reversible capacity and long-term cycling performance, benefiting from entropy-stabilized phase evolution. In addition, an oxygen-redox active P2-type cathode achieved high capacity and energy density through compositional and structural optimization.

To improve battery safety, a garnet-type high-entropy solid electrolyte with high ionic conductivity and exceptional air stability was developed for all-solid-state LIBs. For anode materials, an amorphous bimetallic chalcogenide was designed to mitigate volume expansion, exhibiting high capacity, excellent rate capability, and robust cycling stability.

Operando synchrotron X-ray techniques were extensively employed to elucidate charge storage mechanisms and structural evolution. Overall, this work demonstrates how rational material design, from atomic-level composition to structural engineering, can enable next-generation lithium- and sodium-ion batteries.