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Trifluoroacetic Anhydride: A Dual-Function Electrolyte Additive for Cycle-Life Extension and Flame Retardancy in Li-Metal Batteries
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DOI：10.1149/1945-7111/ae67b2.png)
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Abstract
En 中文
Lithium batteries are pivotal for modern energy storage, yet their performance and safety are critically influenced by electrolyte stability. This study systematically investigates three structurally similar fluorinated anhydrides, difluoroacetic anhydride (DFAA), trifluoroacetic anhydride (TFAA), and pentafluoropropionic anhydride (PFPA), as multifunctional electrolyte additives for lithium metal batteries. Electrochemical evaluations reveal that the addition of 1 wt% TFAA significantly enhances the cycling stability of both LiFePO4 (LFP) and LiNi0.6Co0.2Mn0.2O2 (NCM622) cathodes. After 400 cycles at 1 C, LFP||Li cells with TFAA retain 79.6% capacity, substantially higher than the 59.4% observed with the baseline electrolyte. Similarly, NCM622||Li cells exhibit a capacity retention of 64.4% with TFAA, compared to only 45.3% for the reference. Moreover, TFAA improves rate capability and extends the electrochemical stability window to 4.1 V. XPS and TEM analyses confirm that TFAA facilitates the formation of a thin, uniform, and fluorine-rich solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI), which effectively suppresses electrolyte decomposition and interfacial side reactions. Additionally, TFAA demonstrates notable flame-retardant properties and acts as an effective H2O scavenger, thereby enhancing battery safety. These findings underscore TFAA as a promising multifunctional additive for developing high-performance, long-cycling, and safer lithium metal batteries. Trifluoroacetic anhydride (TFAA) is introduced as a novel dual-function electrolyte additive for simultaneously enhancing cycle life and flame retardancy in Li-metal batteries.TFAA facilitates formation of SEI and CEI layers.TFAA acts as an effective H2O scavenger to prevent HF generation, thereby stabilizing the electrolyte and protecting electrode interfaces.The work provides a multifunctional additive strategy that combines interfacial stabilization, safety enhancement, and moisture removal, offering a practical approach for developing high-performance and safer Li-metal batteries.
Keywords:
lithium battery
fluoroacetic anhydride
electrolyte additives
flame retardancy
H2O scavenger
Journal
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3.3
Papers:
3.3W
Citations:
9.4W
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