What is it about?

In this study, composite gel electrolyte based on Polyvinylidene fluoride (PVDF)/cellulose acetate with the addition of different proportions of lithium nitrate (LiNO3) is prepared by a simple casting method. Salt doping effects on gel electrolyte membrane is investigated by scanning electron microscopy, X-ray analysis, DSC, FT-IR and TGA analysis. Salt doped gel electrolyte membrane shows a porous structure with a high uptake of 150%. Furthermore, with the addition of 20 wt% salt in the gel electrolyte membrane increase the ion conductivity from 0.21×10-3 S cm-1 to 3.0×10-3 S cm-1 at room temperature after soaking 1M LiPF6 EC/DEC liquid electrolyte. As compared with PP 2325 separator, pristine PVDF and PVDF/cellulose acetate gel electrolyte membrane, the salt doped PVDF/cellulose acetate membranes exhibit wide electrochemical window and lower interfacial resistance. Composite gel electrolyte membrane with 10 wt% salt contents possess 100% capacity retention after 100 cycles at 1C rate as compared to PP 2325 separator which shows only 87% capacity retention.

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Why is it important?

Lithium salt doped PVDF/cellulose acetate electrolyte membrane has been developed through the casting method. Due to the high affinity with cellulose acetate and PVDF polymer, lithium salt increased the physical and electrochemical properties of the blended membrane. Due to high affinity towards electrolyte, salt doped electrolyte membrane shows high ion conductivity. Lithium salt doped gel electrolyte possesses good electrochemical window of 4.65V. With 10 wt% salt doping with gel electrolyte membrane provide 100% capacity retention at 1C rate with 100% columbic efficiency. In short, salt doped PVDF/cellulose acetate composite gel electrolyte membrane is a promising candidate as a separator for rechargeable lithium ion batteries.

Perspectives

lithium salt doped gel electrolyte membrane composed of PVDF/cellulose acetate work efficiently without any appreciable loss of capacity at high rate. The gel electrolyte membrane possesses flexibility to withstand against load in the coin cell.

Ph.D. Muhammad Rehman Asghar
Shanghai Jiao Tong University

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This page is a summary of: Lithium Salt Doped Poly(Vinylidene Fluoride)/Cellulose Acetate Composite Gel Electrolyte Membrane for Lithium Ion Battery, IOP Conference Series Materials Science and Engineering, October 2019, Institute of Physics Publishing, DOI: 10.1088/1757-899x/654/1/012017.
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