Polyhedral oligomeric silsesquioxane-polyethylene glycol polymer solid electrolyte material and preparation method thereof

Abstract

The invention discloses a polyhedral oligomeric silsesquioxane-polyethylene glycol polymer solid electrolyte material and a preparation method thereof. The preparation method comprises the following steps: dissolving trimethoxy silane and concentrated hydrochloric acid in an organic solvent with polarity of 5-7, conducting stirring and polymerizing at a controlled temperature to obtain polyhedraloligomeric silsesquioxane with a surface grafted with sulfydryl, further conducting process to obtain pure polyhedral oligomeric silsesquioxane with a surface grafted with sulfydryl, blending the purepolyhedral oligomeric silsesquioxane with a surface grafted with sulfydryl and polyethylene glycol with a single-side double-bond end-capped, adding a photoinitiator and lithium salt into the blend,and performing cross-linking polymerization by ultraviolet irradiation to obtain the polymer solid electrolyte material. According to the invention, the whole process flow of the key preparation process, the reaction conditions of each step and the like are optimized to form an organic block polymer solid electrolyte material; compared with the prior art, the ionic conductivity and the mechanicalproperty of the electrolyte material are improved; the preparation process is simple and easy to implement; and no pollution is generated by ultraviolet polymerization.

Description

technical field [0001] The invention belongs to the field of polymer solid electrolyte materials for lithium ion batteries, and in particular relates to a cage-type polysilsesquioxane-polyethylene glycol polymer solid electrolyte material and a preparation method thereof. Background technique [0002] In today's increasingly serious environmental problems, the development of clean energy has become a focus, but clean energy such as solar energy and wind energy need to be converted into secondary energy—electric energy. As an energy storage device, secondary batteries can convert chemical energy into electrical energy through chemical reactions. Lithium-ion batteries occupy most of the secondary battery market because of their high theoretical specific capacity and light weight. At present, commercial lithium secondary batteries generally use organic carbonate-based liquid electrolytes, but liquid electrolytes have safety problems such as easy leakage, flammability, and explo...

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Problems solved by technology

All-solid-state electrolytes are divided into inorganic electrolytes and polymer electrolytes in terms of composition differences. The former has better ionic conductivity, but its higher modulus and greater brittleness lead to poor processability, so it is used It is more difficult to reach the commercial field; although the latter has better processability, the crystalline transformation of the polymer matrix at room temperature generates crystalline regions, which hinders the conduction of ions in the electrolyte system, thus restricting its use in lithium-ion batteries. practical application

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