A siloxane-terminated polyether lithium battery adhesive and preparation method thereof

Abstract

The invention discloses a preparation method of a siloxane-terminated polyether-type lithium battery adhesive, which comprises the following steps: 1) adding a solvent and a cyanate to a reaction bottle for stirring and mixing, then adding a phase transfer catalyst, and raising the temperature to 70-100°C, constant temperature for 30 minutes to activate and disperse evenly; 2) respectively add metered chlorosilane and polyether-based alcohol or chlorosilane and polyester-based alcohol to the activation reaction solution in step 1), due to the exothermic The reaction temperature is raised to 90-120° C., and the temperature range is maintained for 6-8 hours. After the reaction, the filtrate is obtained by cooling down to room temperature and filtered; the solvent is removed to obtain the siloxane-terminated polyether lithium battery adhesive. The siloxane-terminated polyether lithium battery adhesive of the invention has simple preparation method, low cost, high efficiency and fast adhesion, and is easy to be industrialized. The prepared siloxane-terminated polyether for lithium battery electrode bonding can improve the high efficiency, high and low temperature resistance, stable charge and discharge efficiency and adhesion of lithium batteries.

Description

technical field [0001] The invention relates to an adhesive used in the field of lithium battery materials, in particular to a siloxane-terminated polyether type lithium battery adhesive and a preparation method thereof. Background technique [0002] Due to its high energy density, lithium-ion batteries have played an increasingly important role in the field of new energy. The energy density of lithium-ion batteries exceeds 150WhKg -1 , which is higher than the energy density of almost all known secondary batteries. In order to further improve the performance of lithium-ion batteries, it is necessary to find new electrode materials, electrolytes, and additives. However, the efficiency of lithium-ion batteries depends largely on the optimization of electrode preparation conditions. One of the most important aspects is to find the most suitable electrodes. of adhesives. The binder is a very important part of the positive and negative electrode materials of lithium batteries....

AI Technical Summary

Problems solved by technology

However, there are many defects in these organic solvent-based binders. PVDF-type binders need to take a large amount of NMP solvent to dissolve, and often when the concentration of PVDF is 10-20%, the slurry shows an abnormally high-viscosity behavior. It makes the preparation of the electrode composition difficult. At the same time, because NMP is used as the solvent, on the one hand, it is difficult to volatilize, time-consuming, and the process is complicated; on the other hand, the organic solvent is toxic and flammable, causing environmental pollution and safety problems.

[0005] U.S. Patent US20120153219 describes a polyether-modified siloxane binder, which overcomes the above-mentioned molecular structure deficiency of polar and non-polar lithium battery electrodes, not only endows good lithium ion migration ability, but also has The electrodes have good bonding stability, but this method uses the method of hydrosilicon addition. If the method of heating vulcanization is not used, the vulcanization needs more than 72 hours, which limits the basis of its wide application.

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