报告题目：Effect of oxygen adsorbability on the control of Li₂O₂ growth in Li-O₂ batteries: implications for cathode catalyst design

报告人：Wei Chen (Department of Physics National University of Singapore, Singapore 117542, Singapore, Department of Chemistry, National University of Singapore, 117543, Singapore)  Email: phycw@nus.edu.sg

报告时间：2018年4月23日（周一）上午10:00-11:00

报告地点：独墅湖校区701楼B501

 

报告摘要：

Understanding and controlling the growth of the vital Li₂O₂ product, which is associated with intrinsic property of cathode surface, is essential to design effective cathode catalysts in Li-O₂ batteries. Herein we establish the correlation between the Li₂O₂ growth model and the O₂ adsorbability on cathode surface that determines the pathway of the first electron transfer to O₂. The weak O₂ adsorbability drives the solution growth model to form Li₂O₂ toroid, while the strong one drives the surface growth model to thin film. Based on this mechanism, we select the N-doped carbon nanocages as cathode to realize a simultaneous large discharge capacity and low charge overpotential by forming copious thin-film Li₂O₂, deriving from its high specific surface area and enhanced O₂ adsorbability due to N-doping. Our study demonstrates an effective strategy to design advanced cathode catalysts in Li–O₂ batteries and potentially other metal-air batteries.

 

Reference：

“Recent advances in mechanism and control of Li₂O₂ formation in Li-O₂ batteries” Lyu ZY,  Zhou Y, Dai WR, Cui XH, Lai M, Wang L, Huo FW, Huang W, Hu Z*, Chen Wei*, Chem. Soc. Rev. 46, 6046 – 6072 (2017)

“Effect of oxygen adsorbability on the control of Li2O2 growth in Li-O2 batteries: implications for cathode catalyst design” Lyu ZY, Yang LJ, Luan YP, Wang XR, Wang LJ, Hu ZH, Lu JP, Xiao SN, Zhang F, Wang XZ, Huo FW, Huang W, Hu Z*, Chen Wei*, Nano Energy. 36, 68-75 (2017) DOI: 10.1016/j.nanoen.2017.04.022

Biography

陈 伟 教授 于2001年在南京大学化学系获得学士学位，2004年新加坡国立大学化学系获得博士学位， 2009年初受聘为新加坡国立大学化学系和物理系助理教授,于2013年获得终身制的副教授职位，2016年被聘为新加坡国立大学院长讲席教授, 2017年任化学系副系主任。陈伟教授目前主要关注于低维分子量子结构/二维材料的界面问题，及其在二维材料光电功能器件，有机光电功能器件，及纳米催化等方面的应用．