Abstract
AbstractThe excessive nano‐fillers in gel polymer electrolytes (GPEs) would trend to agglomeration, which will have adverse effect on the electrochemical performance. Modifying the surface properties of nano‐fillers will be an effective way for resolving the problem. In this paper, an ionic liquid (IL), (1‐(trimethoxysilylpropyl)‐3‐butylimidazole bis(trifluoromethylsulfonyl)imide, [CPIM]TFSI) is grafted onto the surface of dendritic mesoporous silica nanoparticles (DMSN), and IL‐modified DMSN (DMSN‐IL) is prepared. The prepared DMSN and DMSN‐IL are respectively introduced into a poly(vinylidene fluoride) (PVDF)‐based gel polymer electrolyte (GPE@IL) to form composite polymer electrolytes (GPE@DMSN and GPE@DMSN‐IL), and their physicochemical characteristics and electrochemical performances are investigated. Due to the surface modification, GPE@DMSN‐IL obtains high ionic conductivity of 1.69×10−3 S cm−1 at 30 °C and large Li+ transference number (0.40). Furthermore, the improved mechanical strength and interface stability enable the Li/GPE@DMSN‐IL/LiFePO4 cell to achieve high rate capacity and outstanding cycle performance at high current density, showing ability for using in high‐performance lithium batteries.
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