Research Seminar of Prof. Yong-Mook KANG from Dongguk University

Lecture Time: 10:00 on 21st January, 2017

Lecture Room: C501 of Science and Innovation Building

Lecture Title:Rational Electrode Design Principles Beyond Li ion Batteries

Yong-Mook Kang*
Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul, Republic of Korea
(*dake@kaist.ac.krordake1234@dongguk.edu)

Abstract

Modern technology-driven society largely relies on energy storage systems or electric vehicles for eco-friendly transportation and the use of high technology devices. Lithium rechargeable batteries are the most promising power sources because of its high energy density but still have a challenge. Graphite is the most widely used anode material in the field of lithium ion secondary battery due to its many advantages such as good cyclic performances, and high charge/discharge efficiency in the initial cycle. However, its low energy density is preventing the current lithium ion secondary battery from realizing electric vehicles or energy storage systems. So, here we will show two-fold pathways to innovatively enhance the energy density of batteries for large-scale applications.
As a first way to solve this problem, we suggest Si-carbon composite nanofibers(NFs) through electrospinning as a candidate anode for lithium ion secondary battery. Electrospun Si-carbon composite NFs displayed excellent cyclic retention and coulombic efficiency due to amorphous carbon framework accommodating the inherent volume expansion of Si nanoparticles during lithiation as well as the enlarged contact area between active materials and conducting agent attributed to the morphological characteristics of its 1D nanostructure. Actually, lithium-air battery can be the real replacement of lithium ion secondary battery because of its high theoretical specific energy coming up to 11,140 Wh/kg. So, some of important issues related to the cathode of lithium-air battery will be also dealt with in this presentation.

Biography:

Prof. Yong-Mook Kang completed his B.S. (1999), M.S. (2001), and Ph.D. (2004) in Korea Advanced Institute of Science and Technology. He has been a senior researcher in Samsung SDI Co., LTD. He is currently a full professor at Department of Energy and Materials Engineering in Dongguk University-Seoul. His research area covers electrode or catalyst materials for Li rechargeable batteries and various post Li batteries, such as Li-air battery, Na rechargeable battery and so on. To date, he has co-authored more than 100 refereed journal articles, more than 50 domestic or international patents, several articles in books or proceedings, and a textbook of nano-science and electrochemical devices. For his research achievements in energy conversion & storage materials, he was elected as a TWAS(Academy of Science for Developing Worlds) Young Affiliate for the first time in South Korea, and awarded the International Collaboration Award of Australian Research Council-2010. From 2015, he has been elected as a RSC (Royal Society of Chemistry) fellow & representative in Korea.