透射电镜表征中锂-氧气电池放电产物的辐照损伤研究  

Irradiation damage on discharge products in lithium-oxygen batteries in TEM

作　　者：彭丽聪 赵倪婕 陈晓[1,2] 肖东东[1] 谷林[1,3] 张志华[2] 

机构地区：[1]中国科学院物理研究所北京凝聚态国家实验室,北京100190 [2]大连交通大学,辽宁大连116028 [3]量子物质科学协同创新中心,北京100190

出　　处：《电子显微学报》2015年第1期7-13,共7页Journal of Chinese Electron Microscopy Society

基　　金：国家重点基础研究发展计划(No.2014CB921002);国家重点基础研究发展计划(No.2012CB921702);中国科学院战略性先导B项目(No.XDB07030200)

摘　　要：本文采用透射电子显微镜研究了锂-氧气电池相关放电产物Li2O2、Li2O、LiOH以及Li2CO3在电子束辐照下的晶体结构和电子结构的变化。研究表明Li2O2、Li2O、LiOH以及Li2CO3在电子束辐照下均存在辐照损伤现象;原位选区电子衍射和电子能量损失谱分析表明在电子束辐照下Li2O的结构基本保持不变,而Li2O2、LiOH以及Li2CO3则向Li2O发生转变,各产物的稳定程度依次为Li2CO3≥LiOH≥Li2O2。且Li2CO3样品的电子束辐照具有取向依赖性,低指数[001]比高指数[103]带轴表现出更高的耐辐照损伤能力。随着辐照剂量增加,Li2CO3样品耐辐照时间缩短,损伤程度加剧。Transmission electron microscopy was employed to study the crystallographic evolution of discharge product Li2 O2 , Li2 O, LiOH and Li2 CO3 in Lithium-oxygen batteries under the electron beam irradiation. The irradiation damage phenomena of the Li2 O2 , Li2 O, LiOH and Li2 CO3 were observed under the electron beam irradiation. By the method of in-situ selected area electron diffraction and electron energy loss spectroscopy, the structure of Li2 O is found to remain unchanged under the electron beam irradiation, but the structures of Li2 O2 , LiOH and Li2 CO3 turned into Li2 O. Li2 CO3 is the most stable one, then LiOH and Li2 O2 . Li2 CO3 sample is directionally dependent on electron irradiation. The [ 001 ] direction performs a higher resistance on radiation damage than [ 103 ] direction. With the increase of electron radiation dose, Li2 CO3 sample has a shorter anti-radiation time and higher damage degree.

关 键 词：锂-氧气电池放电产物 辐照损伤 电子剂量 选区电子衍射 电子能量损失谱 

分 类 号：TM912[电气工程—电力电子与电力传动]