Porous (PVDF-HFP/PANI/GO) ternary hybrid polymer electrolyte membranes for lithium-ion batteries

• Published in: RSC advances Vol. 8; no. 45; pp. 25725 - 25733
• Main Authors: Ahmad, A. L, Farooqui, U. R, Hamid, N. A
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 01.01.2018; The Royal Society of Chemistry
• Subjects: Chemistry; Electrolytes; Ion currents; Lithium; Lithium-ion batteries; Membranes; Morphology; Polyanilines; Porosity; Rechargeable batteries; Tensile strength; Vinylidene
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c8ra03918f

A poly(vinylidene co -hexafluoropropylene) (PVDF-HFP) membrane is functionalized with polyaniline (PANI) and graphene oxide (GO) nanoparticles. The obtained PVDF-HFP polymer electrolyte membranes (PEMs) have been characterized and implemented in lithium-ion batteries. As a result, the PVDF-HFP/PANI membrane shows the highest ionic conductivity (IC) of 1.04 × 10 −3 mS cm −1 compared to pristine PVDF-HFP and PVDF-HFP/PANI/GO ternary membrane; however, PANI addition decreases the tensile strength of the PVDF-HFP membrane from 4.2 MPa to 2.8 MPa. Therefore, GO is introduced to recover the reduced mechanical strength of the PVDF-HFP/PANI membrane. The obtained PVDF-HFP/PANI/GO ternary membrane shows a remarkable improvement in tensile strength of up to 8.8 MPa; however, slight reduction is observed in the ionic conductivity of 6.64 × 10 −4 mS cm −1 . Furthermore, the PVDF-HFP/PANI/GO ternary membrane exhibits outstanding thermal and mechanical stabilities, improved morphology, highest electrolyte uptake (367.5%) and an excellent porosity of around 89%. Moreover, the PVDF-HFP/PANI/GO ternary PEM has been successfully applied in a lithium-ion battery, which can retain over 95% capacity after 30 cycles. Therefore, the proposed PVDF-HFP/PANI/GO ternary membrane can be a promising candidate as a separator in future lithium-ion batteries. A poly(vinylidene co-hexafluoropropylene) (PVDF-HFP)/polyaniline (PANI/graphene oxide (GO) ternary PEM in lithium ion battery.