PVDF-PEO solid composite polymer electrolyte and preparation method thereof

Abstract

The invention discloses a composite polymer electrolyte and a preparation method thereof, and belongs to the technical field of design and preparation of an electrolyte material of a lithium ion battery. The solid polymer electrolyte is composed of PVDF, PEO, nano particle and lithium salt; the polymer base body, lithium salt and nano particle are thermally pressed after ball-milling and mixing, smelting and extruding, thus the composite polymer electrolyte with good electric chemical stability, good film forming performance, high ionic conductivity under room temperature, and small interface resistance is prepared; the composite polymer electrolyte can be applied to a full solid state a lithium ion battery. PVDF is introduced to the polymer electrolyte system, so as to play the effects of improving surface flatness, dimension stability, chemical stability and thermal stability. The polymer electrolyte prepared by thermal pressing method has not introduced the organic solvent as the dispersing agent in preparation process, thereby avoiding that the evaporated solvent in later period of electrolyte prepared by solution casting method pollutes environment; the preparation method belongs to a clean preparation process; the process of thermal pressing method itself is convenient to operate, low in manufacturing cost, and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, solar fuel sensitization batteries and fuel cell electrolytes and their preparations, and particularly relates to a solid polymer electrolyte with good comprehensive performance and a preparation method thereof. The solid polymer electrolyte of the invention can be used for Energy storage devices such as lithium-ion batteries, solar fuel-sensitized cells, fuel cells, and supercapacitors. Background technique [0002] Since Wright discovered that PEO conducts electricity in the 1970s, after more than 40 years of research, blending, cross-linking, grafting, inorganic fillers, ionic liquids, comb polymers, hyperbranched, dendritic and star polymers, and Various modification methods such as organic-inorganic hybridization have been used to improve the ionic conductivity at room temperature, but they have not met the application requirements, and the above-mentioned methods seldom take i...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a PVDF-PEO solid composite polymer electrolyte and its preparation method, which mainly includes the optimized design of the composition of the polymer electrolyte and the clean preparation process, which overcomes the defects of using solvents to prepare electrolytes in the above-mentioned prior art It is difficult to release the mold after hot pressing with other components

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