Self-repairing polymer material as well as preparation method and application thereof

Abstract

The invention discloses a self-repairing polymer material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out reaction on dimer acid and diethylenetriamine for 24h under argon atmosphere to obtain an M-NH2 branched oligomer, wherein the temperature is controlled to be 160 DEG C, and the rotational speed is controlled to be 300-500r / min; and then mixing the M-NH2 branched oligomer and urea according to the mass ratio of the M-NH2 branched oligomer to the urea of 75:1, and sequentially mixing for 2h at the temperature of 130 DEG C, 1h at the temperature of 135 DEG C and 1h at the temperature of 140 DEG C to obtain the yellow colloidal self-repairing polymer material. According to the self-repairing polymer material as well as the preparation method and the application thereof disclosed by the invention, the raw material used in preparation is low in cost and wide in source, so that the preparation cost is low; when being used as an adhesive used for preparation of anode and cathode pieces of a lithium ion battery, the self-repairing polymer material is capable of effectively preventing separation of an active material and a current collector, and the prepared anode and cathode pieces of the lithium ion battery have the advantages of long cycle life and good safety.

Description

technical field [0001] The invention relates to a self-repairing polymer material, a preparation method thereof, and its application as an adhesive used in the preparation of lithium-ion battery negative electrodes, and belongs to the technical field of energy and material synthesis. [0002] It is characterized in that the polymer material can be synthesized by a simple method using simple raw materials, and can be self-repaired at room temperature, and can replace currently commonly used adhesives such as polyvinylidene fluoride as a binder for positive and negative electrode materials of lithium batteries. The self-repairing polymer of the present invention is used as a lithium battery adhesive, which has the advantages of long cycle life, good safety performance and the like when used as an adhesive in lithium ion batteries. Background technique [0003] Lithium-ion batteries have been increasingly widely used due to their advantages such as high open circuit voltage, hi...

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to solve the problem that the adhesives currently on the market cannot effectively prevent the detachment of the active material and the collector plate and the price of the adhesive is generally high, and the purpose is to provide a self-repairing polymer material that can be used as an adhesive and a preparation method thereof. When the self-healing polymer material is used as the adhesive used in the preparation of the positive and negative electrodes of lithium-ion batteries, it can effectively prevent the detachment of the active material and the current collector plate, and the raw materials used in the preparation of the self-healing polymer material dimer acid, diethylene Triamines and urea are cheap and widely available, so their production costs are low

Images