Method for manufacturing gel polymer lithium ion battery

Abstract

The invention discloses a manufacture method of a gel polymer lithium ion battery. The active matters of anode slurry are formed by mixing lithium iron phosphate grains with two or more than two grain diameters or shapes; water is used as a solvent for both the anode slurry and cathode slurry; twin planet stirring is adopted, in the mixing method of the anode slurry and the cathode slurry, and primary mixing is carried out 1 to 3 hours; then the mixture is jetted to an ultrasonic mixer by a high pressure pair roller axial extrusion device for carrying out 0.5 to 2 hours of sonic oscillation mixing; a positive plate and a negative plate are coated, dried and then manufactured into the semi-finished product of a lithium battery; after a gel electrolyte precursor is added, a three-section heating polymerizing method is adopted to carry out thermal polymerization on the electrolyte. The manufacture method of a gel polymer lithium ion battery better solves the problem of small areal density of the polar plate of the lithium iron phosphate material; the areal density can be improved by 20 percent and achieve more than 40mg / cm<2>. The air bubble appearing during the traditional slurry mixing process is basically eliminated; the slurry mixing time is shortened; the energy consumption for the working procedure of mixing is reduced and the environment pollution is eliminated.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a manufacturing method of a gel polymer lithium ion battery. Background technique [0002] Although polymer lithium-ion battery technology has achieved commercial production in large quantities and sales are growing rapidly, its market share is still less than 10%, which is difficult to compare with the 90% market share of liquid lithium-ion batteries. The manufacturing cost of physical lithium-ion batteries is generally higher than that of liquid lithium-ion batteries. However, polymer lithium-ion batteries can be thinned, have arbitrary shapes, and have no safety problems such as leakage. They have strong development potential and are known as the next generation of lithium-ion batteries. [0003] Polymer lithium-ion batteries have a variety of technical types, among which gel polymer lithium-ion batteries have begun to take shape in production, but ...

AI Technical Summary

Problems solved by technology

[0004] 1. In terms of battery performance, the conductivity of gel electrolyte is still low compared with liquid electrolyte, such as poor fast charge and discharge performance and low temperature performance

[0005] 2. In the preparation method of gel electrolyte, no matter the solution casting film forming method or the Bellcore method in the United States, the common problems are cumbersome manufacturing process and high manufacturing cost

For example, Chinese patent 200610123986.7 relates to a preparation method and application of a polymer electrolyte for a gel-state lithium-ion battery, which uses film formation to prepare a polymer electrolyte, and large-scale production is difficult

[0006] 3. The on-site polymerization method is low in cost and easy to produce on a large scale, but the monomer polymerization is not complete, and bubbles are easy to be generated during the polymerization process, which will greatly damage the uniformity of the gel electrolyte and the interface between the gel electrolyte and the electrode sheet, diaphragm, etc. stability

For example, Chinese patent 200410077528.5 relates to a preparation method and application of a polymer electrolyte for a gel-state lithium-ion battery. Using 60°C to 100°C, one-step polymerization for 30 to 120 minutes, the battery is prone to bubbles and swelling, which affects battery performance.

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