Electrolytes play a pivotal role to determine the electrode performances in lithium-ion batteries (LIBs). However, understanding the function of electrolyte components at the molecular scale remains elusive (e.g., salts, solvents, and additives), particularly how they arrange themselves and affect properties of the bulk, liquid-solid interfaces, and electrolyte decomposition, rendering a bottleneck for improving the electrolytes. Herein, the function of electrolyte components is thoroughly studied, from Li+ solvation structure in the bulk electrolyte, Li+ (de-)solvation behaviors at the electrolyte-solid interfaces, until the formation of solid electrolyte interphase (i.e., SEI) layer on the electrodes. Furthermore, a detailed model by taking into account the effects of solvent, additive, lithium salt, and concentration on the electrochemical properties of the Li+-solvent-anion complex to elucidate the electrode performances are depicted. As the ultimate benefit of this study, a completely new non-flammable ether-based electrolyte and stabilizing the promising antimony (Sb) anodes can be designed. Remarkably, a high-performance Sb anode that is superior to previous reports is obtained. This work provides a graphical model to unravel interfacial and interphasial behaviors of electrolyte components in LIBs, which is also significant for developing other metal-ion batteries.
Bibliographical noteKAUST Repository Item: Exported on 2022-11-07
Acknowledgements: The authors greatly thank the National Natural Science Foundation of China (22122904) for funding support. This work is also supported by the National Natural Science Foundation of China (21978281, 22109155, 11974150) and the Fundamental Research Funds for the Central Universities (lzujbky-2021-pd10). The authors also thank the Bureau of International Cooperation Chinese Academy of Sciences, CAS-NST Joint Research Projects (121522KYSB20200047), and the Scientific and Technological Developing Project of Jilin Province (YDZJ202101ZYTS022). The computational work was done on the KAUST supercomputer.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics