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
• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY
• 页码范围: 103-107,后插1-后插2
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/0256-307X/39/2/028202

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 Sn3Fe 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/LixSn.These critical findings pave the way for the mechanism understanding and development of high-performance Sn based alloy electrode materials.