Dual‐Salt Electrolyte Additives Enabled Stable Lithium Metal Anode/Lithium–Manganese‐Rich Cathode Batteries

• Published in: Advanced energy and sustainability research 2022-01, Vol.3 (1), p.n/a
• Main Authors: Zhou, Junhua, Lian, Xueyu, Shi, Qitao, Liu, Yu, Yang, Xiaoqin, Bachmatiuk, Alicja, Liu, Lijun, Sun, Jingyu, Yang, Ruizhi, Choi, Jin-Ho, Rummeli, Mark H.
• Format: Article
• Language: English
• Subjects: Additives; Cathodes; Corrosion; Efficiency; Electrolytes; Electrolytic cells; enhanced structural sustainability; inorganic species-rich SEI and CEI; Interphase; LiBF4 and LiFSI dual-salt additives; Lithium; Lithium batteries; lithium metal anodes; lithium–manganese-rich cathodes; Manganese; Metals; Oxidation; Salts; Solid electrolytes; Viscosity
• ISSN: 2699-9412; 2699-9412
• DOI: 10.1002/aesr.202100140

Although lithium (Li) metal anode/lithium–manganese‐rich (LMR) cathode batteries have an ultrahigh energy density, the highly active Li metal and structural deterioration of LMR can make the usage of these batteries difficult. Herein, a multifunctional electrolyte containing LiBF4 and LiFSI dual‐salt additives is designed, which enables the superior cyclability of Li/LMR cells with capacity retentions of ≈83.4%, 80.4%, and 76.6% after 400 cycles at 0.5, 1, and 2 C, respectively. The dual‐salt electrolyte can form a thin, uniform, and inorganic species‐rich solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI). In addition, it alleviates the bulk Li corrosion and enhances the structural sustainability of LMR cathode. Moreover, the electrolyte design strategy provides insights to develop other high‐voltage lithium metal batteries (HVLMBs) to enhance the cycle stability. Herein, a multifunctional electrolyte containing LiBF4 and LiFSI dual‐salt additives is designed, which enable a superior cyclability in Li anode/Li‐rich cathode cells, owing to an enhanced interface and bulk structural sustainability.