2024年9月12日，Elsevier 旗下top期刊《Journal of Colloid and Interface Science》在线发表了云南师范大学化学与化工学院肖凤屏博士、能源与环境科学学院胡鹏博士合作的最新研究成果《Fluorinated ester additive to regulate nucleation behavior and interfacial chemistry of room temperature sodium-sulfur batteries》。云南师范大学化学与化工学院肖凤萍博士、能源与环境科学学院胡鹏博士和中国科学技术大学国家同步辐射实验室Li Yanbo为共同通讯作者。合作单位还有南开大学先进能源材料化学教育部重点实验室、中国科学技术大学国家同步辐射实验室。

https://www.sciencedirect.com/science/article/abs/pii/S0021979724021349

Abstract

Room temperature sodium-sulfur (RT Na-S) batteries are considered as advanced energy storage technology due to their low cost and high theoretical energy density. However, challenges such as the growth of sodium dendrite and dissolution of sodium polysulfides significantly hinder the electrochemical performance. Herein, we developed a propylene carbonate (PC)-based electrolyte with Methyl 2-Fluoroisobutyrate (MFB) as an additive. The ester group in the MFB additive is capable of participating in and reconfiguring the coordination of their Na+ solvated structures, thereby lowering the desolvation barrier and regulating the Na anode’s interfacial reaction and nucleation behavior. The polar C−F bond at the other end helps to reduce the lowest unoccupied molecular orbital (LUMO) energy of the MFB additive, enabling the preferential decomposition of MFB to form the F-rich inorganic phase strong polar solid electrolyte interphase (SEI), contributing to the inhibition of Na dendrite growth, the accumulation of dead Na. In addition, NaF-riched cathode electrolyte interphase (CEI) was also observed on sulfur-based cathode, which can effectively inhibited the shuttle effect. Consequently, the developed RT Na-S battery exhibit excellent electrochemical performance。

扩展阅读：

云师大化工学院肖凤屏博士在《J COLLOID INTERF SCI》发表最新研究成果

胡鹏-云南师范大学能源与环境科学学院