Production process of waterborne positive lithium ion battery

Abstract

The invention belongs to the field of production of lithium ion batteries, in particular to a production process of a waterborne positive lithium ion battery. The production process comprises the following steps of: preparing an anode and a cathode, coating on the anode and the cathode, flaking, baking, preparing an electric core, testing short circuit, baking, putting a lower spacer into a shell, welding a bottom, putting an upper spacer and folding a positive lug, rolling a slot and testing short circuit; and injecting liquid, wiping the positive lug, welding the positive lug with a cover plate, folding the cover plate for covering, sealing, cleaning, standing, performing formation, standing and performing capacity grading. The anode comprises the following components in parts by weight: 100 parts of lithium iron phosphate, 3-4 parts of super conductive carbon black, 2-3 parts of conductive graphite, 3.5-4 parts of waterborne adhesive, 2.5-3 parts of NMP (N-methylpyrrolidone) and 80-85 parts of deionized water and is prepared by the following steps of: mixing the waterborne adhesive, the NMP and the deionized water; adding other raw materials; and stirring to obtain anode slurry. Compared with the conventional oily process of the lithium ion battery, the production process has the advantages of low energy consumption, high production efficiency, low product cost and the like.

Description

technical field [0001] The invention belongs to the field of lithium ion battery production, and in particular relates to a production process of an aqueous positive electrode lithium ion battery. Background technique [0002] The existing lithium-ion battery production process is mainly an oily system using NMP as a solvent. A large amount of NMP (N-methylpyrrolidone) is used in the production of batteries in this system. NMP is a chemical substance synthesized from petroleum and has a small amount of toxicity. , a large amount of emissions will cause air pollution; even if it is recycled, it can only reach 70%-80% of the recycling amount, and it is necessary to purchase professional recycling equipment when recycling, and the power consumption of the equipment is extremely high; and the price of NMP is extremely high, the lowest price in 2010 The price of NMP is 22,000 yuan / ton. With the increase of oil price, the price of NMP is also rising all the way. When the oil is ti...

AI Technical Summary

Problems solved by technology

However, the production process of the existing water-based positive electrode lithium-ion battery is consistent with the oily system, and the production process of the oily system is as follows: figure 1 As shown, there is no production process specifically for aqueous cathode lithium-ion batteries

[0004] At present, the lithium-ion battery of the oily system is widely used because of its perfect process and relatively stable battery performance. However, the disadvantage is that the production cost is too high, and it is often limited by the raw materials. The control of water in the process control also needs to be controlled from the front to the back. Many enterprises are restricted by energy consumption quotas; although there are several manufacturers of water-based lithium-ion batteries, the production process still adopts the oil-based production process. Although the prepared products can be used, there are three main problems: 1. Coating only Aluminum foil with a thickness of 0.02mm or more can be used. If the product uses aluminum foil with a thickness of 0.016mm, it will be difficult to coat due to excessive surface tension. ;2. The water removal of the product is not thorough, and there is an air swelling problem after the battery is formed, so the performance of the product is much worse than that of the oily system, which makes it difficult to control the consistency of the product performance, and can only be applied to the shell On thicker and harder large batteries; 3. After the slurry is used, the waste on the barrel wall is not properly disposed of, causing waste and polluting the environment

[0005] It can be seen from the above that the cost of lithium-ion batteries in the oily system needs to be reduced urgently. Only by reducing the cost can we occupy a larger market; but the cost cannot be reduced without reducing the product performance.

Although the cost of lithium-ion batteries in the aqueous system has advantages and can solve the problem to a certain extent, there is still a lack of a production process that specifically guarantees product performance and performance consistency

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