Manufacturing method of two-step polymerized electrolyte matrix and polymer lithium-ion battery

Abstract

The invention provides a manufacturing method of a two-step polymerized electrolyte matrix and a polymer lithium-ion battery, wherein, a polymer monomer, an initiator and an appropriate amount of plasticizer are mixed to form solution, the solution is coated on a polyethylene-propylene diaphragm, and the first polymerization is carried out under the action of the initiator to form a porous polymer. Then, drying, impurity removing and purification are carried out, a positive pole piece and a negative pole piece are combined and arranged into an electrical core, electrolyte and a crosslinking agent are injected, and the polymer and the electrolyte are further reacted under the action of the crosslinking agent, thereby polymerizing into the porous-gel compound polymer electrolyte and manufacturing the polymer lithium-ion battery with high safety.

Description

【Technical field】 [0001] The present invention relates to lithium cobalt oxide LiCoO 2 , lithium nickel oxide LiNiO 2 , lithium cobalt nickel oxide LiCoNiO 2 , lithium manganese oxide LiMn 2 o 4 ,, nickel cobalt manganese lithium oxide Li α Ni β co γ mn δ o 2 or lithium iron phosphate LiFePO 4 One or more of them are used as the positive electrode active material, and natural modified graphite, artificial synthetic graphite, and composite graphite are used as the negative electrode active material. Cylindrical or square lithium-ion batteries. 【Background technique】 [0002] The main difference between a polymer lithium-ion battery and a liquid electrolyte lithium-ion battery is that its electrolyte is an electrolyte membrane in a solid or colloidal state. At present, the polymer electrolytes used in polymer lithium-ion batteries mainly include gel type and porous type. [0003] Among the various technologies of porous polymer lithium-ion batteries, the Bellcore t...

AI Technical Summary

Problems solved by technology

[0004] 1. There is still free electrolyte in the battery

[0005] 2. The process is complicated, the operation time is long, the production cost is high, the yield is very low, and the process technology is difficult to apply to low-cost, large-scale production

[0006] 3. The internal structure of the battery is loose, and the gas generated during charging and discharging is likely to cause problems such as expansion and deformation of the battery

[0007] 4. Thermal melt protection function is affected

Since this type of polymer electrolyte separator does not have the polyethylene / propylene composite separator used in liquid lithium batteries, there is no thermal fusion protection mechanism of the original separator between the positive and negative electrodes.

[0008] 5. The film layer is thicker and the internal resistance of the battery is large

[0011] 1. The preparation process requires high requirements and the polymerization effect is difficult to grasp;

[0012] 2. High requirements on the purity of raw materials, expensive prices, and high manufacturing costs;

[0013] 3. The electrochemical stability is poor, and the battery charge and discharge cycle attenuation is serious;

[0014] 4. The mechanical strength is not high, and it is easy to produce gas swelling