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Updated: Jan 15, 2026
Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Recubrimiento de AlF3 Mediante la Estabilización In-Situ de la Interfaz del Cátodo para Baterías de Iones de Sodio de
Ya-Meng Yin1,2, Qinxia Liu1, Zhiyuan Zhang1
1Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei, China.
Abstract:
The instability of the cathode electrolyte interface (CEI) under high voltage and elevated temperature poses a major challenge to the practical application of Na3V2(PO4)2O2F (NVOPF) cathodes in sodium-ion batteries (SIBs). To overcome this issue, we introduce a dual-functional AlF3 coating that effectively stabilizes the interface while improving bulk electronic conductivity. The AlF3-modified NVOPF@C exhibits exceptional cycling stability at 55°C, maintaining 84.9% capacity after 1000 cycles at 10 C in half cells and 96.8% at 5 C in full cells using hard carbon anodes. Detailed characterization reveals that the AlF3 coating promotes the formation of a robust, inorganic-rich CEI, primarily composed of a NaF/AlF3/NaAlF4 ternary fluoride composite. This newly constructed CEI layer not only acts as a protective barrier to suppress detrimental interfacial side reactions but also serves as an efficient ionic conductor to facilitate Na+ diffusion. In addition, the AlF3 coating induces the creation of F─Al─O bridging bonds with surface oxygen groups, which collaborate with carbon nanotubes to establish a highly continuous conductive network that enables efficient electron transfer. These findings underscore the crucial significance of constructing a stable inorganic-dominated CEI and continuous conductive pathways for developing high-rate and thermally stable SIBs.
