Electrochemical Role of Transition Metals in Sn-Fe Alloy Revealed by Operando Magnetometry  

作　　者：Le-Qing Zhang Qing-Tao Xia Zhao-Hui Li Yuan-Yuan Han Xi-Xiang Xu Xin-Long Zhao Xia Wang Yuan-Yuan Pan Hong-Sen Li Qiang Li 张乐清;夏清涛;李召辉;韩媛媛;徐熙祥;赵新龙;王霞;潘圆圆;李洪森;李强(College of Physics,Qingdao University,Qingdao 266071,China;Weihai Innovation Institute,Qingdao University,Weihai 264200,China)

机构地区：[1]College of Physics,Qingdao University,Qingdao 266071,China [2]Weihai Innovation Institute,Qingdao University,Weihai 264200,China

出　　处：《Chinese Physics Letters》2022年第2期82-86,共5页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.22179066 and 11504192);the Natural Science Foundation of Shandong Province(Grant No.ZR2020MA073)。

摘　　要：As promising materials,alloy-type anode materials have been intensively investigated in both academia and industry.To release huge volume expansion during alloying/dealloying process,they are usually doped with transition metals.However,the electrochemical role of transition metals has not been fully understood.Here,pure Sn_(3)Fe films were deposited by sputtering,and the electrochemical mechanism was systematically investigated by operando magnetometry.We confirmed that Fe particles liberated by Li insertion recombine partially with Sn during the delithiation,while the stepwise increase in magnetization with the cycles demonstrates growth of Fe nanoparticles.In addition,we also found an unconventional increase of magnetization in the charging process,which can be attributed to the space charge storage at the interface of Fe/Li_(x)Sn.These critical findings pave the way for the mechanism understanding and development of high-performance Sn based alloy electrode materials.

关 键 词：ALLOY ALLOYING MAGNETIZATION 

分 类 号：TM912[电气工程—电力电子与电力传动] TG146.14[一般工业技术—材料科学与工程]