Work

Multifunctional Nanocomposite Polymer‐integrated Ca‐doped CeO 2 Electrolyte for Robust and High‐rate All‐solid‐state Sodium‐ion Batteries

Year: 2024

Type: article

Abstract: Due to the seamless interfaces between solid polymer electrolytes (SPEs) and electrode materials, SPEs‐based all‐solid‐state sodium‐ion batteries (ASSSIBs) are considered promising energy storage systems. However, the sluggish Na + transport and uncontrollable Na dendrite propagation still hinder the practical application of SPEs‐based ASSSIBs. Herein, Ca‐doped CeO 2 (Ca−CeO 2 ) nanotube framework is synthesized and integrated with poly (ethylene oxide) methyl ether acrylate‐perfluoropolyether copolymer (PEOA‐PFPE), resulting in multifunctional solid nanocomposite electrolytes (namely SNEs, i.e., PEOA‐PFPE/Ca−CeO 2 ). Our investigations demonstrate that the fluorous effect incurred by the fluorine‐containing PEOA‐PFPE and the oxygen vacancy effect induced by the Ca−CeO 2 framework could synergistically promote the dissociation of sodium salt, ultimately enhancing the Na + mobility in SNEs. Besides, the resultant SNEs construct rapid Na + transport channels and homogenize the Na deposition in SNEs/Na interface, which effectively prevents the Na dendrite growth. Furthermore, the assembled carbon‐coated sodium vanadium phosphate (NVP@C)||PEOA‐PFPE/Ca−CeO 2 ||Na coin cell delivers impressive rate capability of 97.9 mAh g −1 at 2 C and outstanding cycling stability with capacity retention of 84.3 % after 300 cycles at 1 C. This work illustrates that constructing multifunctional SNEs via incorporating functional inorganic frameworks into fluorine‐containing SPEs could be a promising strategy for the commercialization of robust and high‐performance ASSSIBs.

Source: Angewandte Chemie International Edition

DOI: 10.1002/anie.202417778