Polymer lithium ion battery and making method thereof

Abstract

The invention discloses a making method of a polymer lithium ion battery. The method comprises the following steps: 1, adding an aqueous dispersion of a lithium acrylate-acrylonitrile copolymer into deionized water; 2, immersing the positive and negative electrodes of a battery in the deionized water to make the lithium acrylate-acrylonitrile copolymer attached to the positive and negative electrodes of the battery; and 3, gelating at 50-85DEG C for 30-240min 1-2 times after the molding of the battery to respectively form a gel electrolyte coating on the positive and negative electrodes of the battery. Compared with methods using a vinylidene fluoride-hexafluoropropene copolymer, the method using the above lithium acrylate-acrylonitrile copolymer synthesis technology has the advantages of simplicity, low cost and benefiting for the mass use of the technology. The invention also discloses the polymer lithium ion battery.

Description

technical field [0001] The invention relates to a polymer lithium ion battery and a manufacturing method thereof. The polymer lithium ion battery is widely used in mobile phones, digital products, electric tools, electric vehicles and other products. Background technique [0002] There are three main modes of existing technology: [0003] The first mode: the gel electrolyte is coated on the positive and negative electrodes of the battery in an anhydrous environment, and then wound together with the separator in an anhydrous environment. gelation to form a polymer lithium-ion battery. [0004] The second mode: add a certain proportion of homopolymer or copolymer of ethylene oxide and propylene oxide to the ordinary electrolyte, and add a certain proportion of initiator after the battery is filled with the electrolyte. After the battery is formed Under certain temperature and pressure, gelation is carried out to form a polymer lithium-ion battery. [0005] The third mode: d...

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Problems solved by technology

[0007] The first mode requires the entire manufacturing process of the battery to be in an anhydrous environment. At the same time, the entire manufacturing process must be completed with equipment, and the requirements for the gel electrolyte are extremely high, and it is required to maintain good conductivity and Fluidity must also ensure a certain viscosity to make it easy to coat on the pole piece, so it is difficult to achieve both in terms of manufacturing cost and general process

[0008] The second mode is that the homopolymer or copolymer of ethylene oxide and propylene oxide added to the electrolyte is a toxic and carcinogenic substance, and it is required to be below 5°C during transportation and storage. Homopolymerization reaction, gelation in advance, so there is a relatively high cost of use, generally rarely used

[0009] The third mode uses organic solvents, and uses relatively volatile solvents. There are fire hazards and the possibility of air pollution during use. Long-term exposure to these organic solvents will also cause harm to the human body. Higher technical requirements

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