Silicon micropillar electrodes of lithiumion batteries used for characterizing electrolyte additives

• 作者: Fangrong Hu Mingyang Zhang Wenbin Qi Jieyun Zheng Yue Sun Jianyu Kang Hailong Yu Qiyu Wang Shijuan Chen Xinhua Sun Baogang Quan Junjie Li Changzhi Gu Hong Li
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY
• 页码范围: 739-748
• 页数: 10页
• 语种: 英文
• DOI: 10.1088/1674-1056/abf558

摘要

The <100> crystal-oriented silicon micropillar array platforms were prepared by microfabrication processes for the pur-pose of electrolyte additive identification.The silicon micropillar array platform was used for the study of fluorinated vinyl carbonate (FEC),vinyl ethylene carbonate (VEC),ethylene sulfite (ES),and vinyl carbonate (VC) electrolyte additives in the LiPF6 dissolved in a mixture of ethylene carbonate and diethyl carbonate electrolyte system using charge/discharge cycles,electrochemical impedance spectroscopy,cyclic voltammetry,scanning electron microscopy,and x-ray photo-electron spectroscopy.The results show that the silicon pillar morphology displays cross-shaped expansion after lithia-tion/delithiation,the inorganic lithium salt keeps the silicon pillar morphology intact,and the organic lithium salt content promotes a rougher silicon pillar surface.The presence of poly-(VC) components on the surface of FEC and VC elec-trodes allows the silicon pillar to accommodate greater volume expansion while remaining intact.This work provides a standard,fast,and effective test method for the performance analysis of electrolyte additives and provides guidance for the development of new electrolyte additives.