A novel porous gel polymer electrolyte based on poly(acrylonitrile-maleic anhydride) composite by polyhedral oligomeric silsesquioxane for lithium-ion batteries

摘要

A novel porous polymer membrane based on polyhedral oligomeric silsesquioxane (POSS) composite poly(acrylonitrile-maleic anhydride) (P(AN-MAH)) is prepared by phase inversion method, and corresponding P(AN-MAH) composite gel polymer electrolyte (GPE) is prepared by further absorbing the liquid electrolyte. The structure of the prepared POSS and P(AN-MAH), and the properties of the composite P(AN-MAH) membranes and GPEs are investigated. The results indicate that the introduction of POSS significantly reduces the crystallinity of P(AN-MAH), which gives the composite membrane and GPE excellent performance. Compared with pure P(AN-MAH)-based membrane and GPE, the composite membrane containing 5 wt% POSS exhibits the best porosity (69.9%) and electrolyte uptake (311.9 wt%), and the most excellent electrochemical performance is also presented by the corresponding GPE: enhanced ionic conductivity of 2.51 x 10(-3) S cm(-1) at room temperature; better compatibility with electrode; significantly increased lithium-ion transference number of 0.53; a remarkably widened electrochemical stability window of 5.6 V (vs. Li/Li+); a higher discharge specific capacity of 147 mAh g(-1) with a Li/GPE-5%/LiFePO4 cell at 0.2 C. Graphic