Preparation method of high-flexibility polymer solid-state electrolyte membrane and preparation method of lithium ion battery

Abstract

Disclosed are a preparation method of a high-flexibility polymer solid-state electrolyte membrane and a preparation method of a lithium ion battery. The preparation method of the high-flexibility polymer solid-state electrolyte membrane comprises the steps of enabling surface modified polyethylene glycol to be reacted with 3-isocyanopropyl triethoxysilane IPTS to generate silanization polyethyleneglycol; enabling the silanization polyethylene glycol to be crosslinked with crosslinking molecules to generate crosslinked molecule polyethylene glycol; and enabling the crosslinked molecule polyethylene glycol and a crosslinking agent NCO-PPO2300-NCO into chloroform to be reacted for the first preset time, and then pouring into a die to be crosslinked to obtain the membrane. The preparation method achieves the beneficial effects as follows: the silanization polyethylene glycol and the crosslinked molecules can form a high-flexibility super-molecular structure, so that the polymer solid-state electrolyte membrane has excellent mechanical strength, the maximum elongation at break of 700% and extremely excellent tensile property and elasticity; and therefore, a high contact interface can be formed with a battery electrode, interface impedance can be lowered, the macroscopic electrical conductivity of the battery can be improved, and requirement of a high-energy-density lithium batteryon the market can be satisfied.

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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