Preparation and electrochemical study of PVDF-HFP/LATP/g-C3N4 composite polymer electrolyte membrane

• Published in: Inorganic chemistry communications 2021-09, Vol.131, p.108793, Article 108793
• Main Authors: Zhang, Qian, Wang, Qing, Huang, Shoushuang, Jiang, Yong, Chen, Zhiwen
• Format: Article
• Language: English
• Subjects: Ceramic; Composite polymer electrolyte; Ionic conductivity; Lithium storage; Separator
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2021.108793

[Display omitted] •Porous layered graphitic-C3N4 suppresses the crystallization of the polymer PVDF-HFP.•Graphitic-C3N4 improves the ionic conductivity of the CPE membrane.•PVDF-HFP/LATP/g-C3N4 membrane has a wide electrochemical window (5 V) in Li symmetrical cell.•PVDF-HFP/LATP/g-C3N4 membrane good compatibility and electrochemical stability with lithium metal. Li1.3Al0.3Ti1.7(PO4)3 powder (LATP) is synthesized by high temperature solid phase method, and then a composite polymer electrolyte membrane Poly(Vinylidene Fluoride-Hexafluoropropylene)/LATP/graphitic-C3N4 is prepared by a simple casting method. Then, the influence of porous layered g-C3N4 on the composite polymer electrolyte membrane is studied by morphology characterization and electrochemical measurement. The experimental results show that the addition of g-C3N4 improves the ionic conductivity (2.55 × 10-5 S cm−1) and lithium ion transference number (0.647) of the composite polymer electrolyte membrane (CPE), and the CPE membrane PVDF-HFP/LATP/g-C3N4 has a broad electrochemical window (up to 5.0 V) and superior electrochemical stability.