Gel state polymer lithium ion battery

Abstract

The invention discloses a gel state polymer lithium ion battery. Battery anode slurry active material is made by mixing lithium vanadium phosphate particles with two or more than two particle sizes or shapes. A method for mixing anode and cathode slurry is as follows: preliminary mixing is carried out for 1 to 3 hours by double planetary mixing; and the then anode and cathode slurry is sprayed to an ultrasonic mixer by a high-pressure double-roll axial extrusion device to carry out ultrasonic vibration mixing 0.5 to 2 hours. An anode sheet and a cathode sheet are coated and dried and then are made into a lithium battery semifinished product. After a gel electrolyte precursor is added, the lithium battery semifinished product is precharged and then is carried out the electrolyte thermal polymerization by a three-section heating polymerization. The gel state polymer lithium ion battery can improves the intensity of the pole piece surface of lithium vanadium phosphate material by 20 percent to more than 60mg / cm<2>. The gel state polymer lithium ion battery eliminates the air bubble occurring during the traditional slurry mixing process, shortens the time for mixing the slurry and reduces the energy consumption during the mixing process.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a gel-state 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-state polymer lithium-ion batteries have begun to take shape in production, but there are stil...

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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