时 间：2018年10月15日 15:30
Abstract：I will report some of our works based on micro-/nanostructure materials for the use of lithium ion battery (LIB) and sodium ion battery anodes. The samples in half cells were lab-tested. These hierarchical structured electrode materials exhibited superior electrochemical performance owing to (i) their large porosity – large surface areas for nucleation sites of active components; (ii) high conductivity – facilitates ions transfer; and (iii) improved mechanical strength.
In this talk, I will also review some commonly used LIBs. Typical LIBs have specific capacity (practical) of 100 – 250 Wh/kg, which are not quite sufficient for long–range electric vehicles and high-end portable electronics. More rigorous requirements are demanded such as: energy density (>400Wh/kg); safety (non-explosive, extensive thermal range, environment friendly); low cost; long life span and cyclic life; and high coulomb efficiency. The Li metal anode batteries (LMBs) including Li?sulfur (Li?S) batteries, and Li anode vs intercalation type cathode batteries indicate a huge increase in theoretical energy density when compared with current LIBs. The LMBs are strongly regarded as the next-generation batteries beyond the LIBs. We will discuss some aspects; and challenges and ways forward of the LMBs, in particular, the LiS batteries.
Biography：Dickon H L. Ng (吳恒亮) received his PhD from the Department of Physics at University of Manitoba (Canada), and completed two years of postdoctoral work in The Department of Materials at the University of Oxford before joining the Physics Department at the Chinese University of Hong Kong in 1991. He was the Associate Dean (Students Affair) in the Faculty of Science from 2008 to 2015 before being the Chairman of the Physics Department from 2015 to 2018. His current interests include biomorphic materials for photo-catalysis, water treatments, and energy storage devices.