Journal
JOURNAL OF POWER SOURCES
Volume 581, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2023.233446
Keywords
Cathode-electrolyte interface impedance; High-performance solid-state battery; Molecular design; Polyurethane-based electrolyte; Interface
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The poor interface contact between the electrode and solid electrolyte is a major obstacle damaging the cycle performance of solid-state lithium-ion batteries. Adding an organic interfacial superionic conductor (ISC) based on polyether polyols (PPG) can enhance the ion-diffusion kinetics on the electrolyte/cathode interface and improve the rate capability. The assembled LFP cathode demonstrated a high specific capacity of -95.7 mAh/g with a retention of -92% after 1000 cycles at 10 C.
The poor interface contact between the electrode and solid electrolyte is a major obstacle damaging the cycle performance and stability of solid-state lithium-ion batteries. Adding inorganic or organic layer as the buffers on the electrode/electrolyte interface can improve the physical contact, but still hardly achieve high rate capability due to the slow ion-diffusion kinetics on the interface. Here, we design an organic interfacial superionic conductor (ISC) with high ion-conductivity based on polyether polyols (PPG) through polar functional-group modification to enhance the ion-diffusion kinetics on the polyurethane-based electrolyte/cathode interface and construct ion-conductive framework in LFP cathode, which was verified by cryogenic electron microscopy (Cryo-EM) and surface enhanced Raman spectroscopy (SERS). Consequently, the assembled LFP cathode demonstrated a high specific capacity of -95.7 mAh/g with retention of -92% after 1000 cycles at 10 C.
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