Preparation method of highly flexible polymer solid electrolyte membrane and preparation method of lithium ion battery

Abstract

A preparation method of a highly flexible polymer solid-state electrolyte membrane and a preparation method of a lithium-ion battery, comprising reacting surface-modified polyethylene glycol with 3-isocyanopropyltriethoxysilane IPTS to generate silanized polyethylene glycol Diol; the silanized polyethylene glycol and cross-linking molecules are cross-linked to generate cross-linked molecularized polyethylene glycol; the cross-linked molecularized polyethylene glycol and cross-linking agent NCO- Add PPO2300‑NCO into chloroform, react for the first preset time, and pour it into a mold to form a cross-linked film. The beneficial effects of the present invention are: silanized polyethylene glycol and cross-linked molecules form a highly flexible supramolecular structure, so that the polymer solid electrolyte membrane has excellent mechanical strength, and the maximum elongation at break can reach 700%, which is exceptionally excellent Excellent tensile properties and elasticity, so it can form a good contact interface with the battery electrodes, reduce the interface impedance, improve the macroscopic conductivity of the battery, and meet the needs of high energy density lithium batteries on the market.

Description

technical field [0001] The invention relates to the technical field of green energy storage, in particular to a preparation method of a highly flexible polymer solid-state electrolyte membrane and a preparation method of a lithium-ion battery. Background technique [0002] Solid-state lithium-ion batteries have attracted more and more attention due to their high power density, long cycle life and high safety. Solid-state lithium-ion batteries are mainly composed of positive electrode materials, lithium metal negative electrodes, and solid-state electrolytes. Solid-state electrolytes have been researched and explored by researchers as an important component. Solid electrolytes are mainly divided into three categories: inorganic solid electrolytes, polymer solid electrolytes, and composite solid electrolytes. [0003] In 1973, Wright et al first discovered that polyoxyethylene and alkali metal salt complexes have ion conductivity. In 1979, Armand proposed that polyethylene o...

AI Technical Summary

Problems solved by technology

While many electrolytes can be assembled into a scaffold-free membrane that achieves promising electrochemical performance, it still needs to be sufficiently high in mechanical strength for conventional mass-production packaging processes.

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