报告题目：High-Capacity of Li-Rich Layered Cathode Material for High-Energy Li-Ion batteries
报告人：新加坡国立大学机械工程系吕力教授
报告时间：2016年5月11日(周三)上午10：30
报告地点：材料学院曹光彪楼326会议室
邀请人：潘洪革教授
报告摘要：
The high-energy-density Li-rich layered materials are promising cathode materials for the next-generation high-performance lithium-ion batteries. They have attracted a lot of attentions due mainly to their high reversible capacity of more than 250 mAh·g-1. However several drawbacks still hinder their applications, such as voltage decay caused by an undesired phase transformation during cycling and poor rate capability. To conquer these issues, the authors applied F doping and surface modification on the pristine Li1.2Mn0.54Ni0.13Co0.13O2. In both works, the enhancement in the electrochemical properties of modified materials are comprehensively investigated. To conquer the poor cycling stability, fluorine doping was conducted on. Except for the enhanced capacity retention, F doping shows remarkable effect to stabilize the layered structure by retarding the undesired layered-to-spinel phase transition. Due to the severe layered-to-spinel phase transformation in the pristine material, the cathodic peak for Mn reduction decays from 3.38 V to 2.78 V in 100 cycles, accompanied by severe capacity decrease. The F doped materials exhibit more stable discharge voltage in 100 cycles. In addition to Li-rich layer-structure cathode, this talk will also provide information about possible enhancement of capacity for spinel LiMn2O4 composited with Li2MnO3.
报告人简介：
Lu Li received his B.Eng and M. Eng from Tsinghua University, China, and his Ph.D from the Katholiek Universiteit Leuven, Belgium. After four years of doctoral study and two years of post-doctoral work at the Departement Metaalkunde en Toegepaste (Department of Metallurgy and Materials Engineering), Katholieke Universiteit Leuven (Catholic University of Leuven), Belgium, he joined the Department of Mechanical Engineering, National University of Singapore in 1991 and is a Full Professor. Dr. Lu is heavily involved in the research of functional materials, mainly in two directions: i) materials for Li-ion rechargeable batteries which include traditional bulk batteries and all-solid-state batteries, and for supercapacitors, and ii) piezoelectric and ferroelectric materials. To realize his dream of fast charging of Li-ion batteries, the research group under Dr. Lu has intensively worked on development of high performance cathode materials. Dr. Lu is also interested in technology transfer from his research laboratory to industries.
Dr. Lu has published about 390 papers in international journals and 3 monographs. He is currently the Editor-in-Chief of Functional Materials Letters (World Scientific Publisher), Associate Editor of Materials Technology (Taylor & Francis) particularly in charge of functional materials, and member of Editorial Board of Scientific Report (Nature Publishers) in charge of energy storage materials. Dr. Lu was also Guest Professor of Zhejiang University, Peking University Shenzhen Graduate School, China and Queensland University, Australia.
