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

A lithium-ion battery and polymer technology, applied in battery electrodes, secondary batteries, and final product manufacturing, etc., can solve the problems of loose battery structure, high preparation process requirements, and long operation time, and achieve strong electrolyte adsorption capacity, The effect of improving safety performance and strong bonding effect

Inactive Publication Date: 2010-03-24
江苏海四达电源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ba

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment one: the preparation method of the composite film containing polymer matrix

[0068] The preparation of the coating solution is to mix monomers, initiators, plasticizers, etc. in proportion. The monomers are methyl methacrylate and butyl acrylate, the initiator is dibenzoyl peroxide, and the plasticizer is carbonic acid. Diethyl ester (DEC) in a ratio of 500:500:1:3000. Then put it into the slurry hopper of special coating equipment, put the rolled diaphragm on the discharge rack, enter the slurry hopper quantitatively through the tension adjustment wheel, make the diaphragm absorb 60% (wt) slurry by weight ratio, and then enter the polymerization section, heat Thermal polymerization is carried out at 75-85°C. At this temperature, methyl methacrylate and butyl acrylate chemically react with the initiator dibenzoyl peroxide respectively, and the thermal polymerization reaction ends within 10 minutes, and the monomer methyl methacrylate and butyl acrylate genera...

Embodiment 2

[0074] Manufacturing method of winding type ternary material cathode lithium ion battery core:

[0075] Manufacturing method of positive electrode sheet:

[0076] The cathode material ternary material Li(Mn 1 / 3 co 1 / 3 Ni 1 / 3 )O 2 , conductive agent Super "P", adhesive PVDF, and solvent NMP in a weight ratio of 100:2.5:3.5:47 to synthesize a slurry, and coat it on a 0.02mm thick aluminum foil. Cut the positive electrode strip into a long shape with a width of 28 mm: an uncoated aluminum foil is left at the appropriate position of the pole piece, and an aluminum lead will be spot-welded on its surface in a subsequent process.

[0077] Manufacturing method of negative electrode sheet:

[0078] Negative electrode material artificial graphite CMS, conductive agent, binder, and solvent were synthesized into a slurry in a weight ratio of 100:7:6:52, and coated on a 0.01 mm thick copper foil. Cut the negative electrode strip into a long shape with a width of 29mm: an uncoated co...

Embodiment 3

[0087] Use the following method to produce laminated lithium iron phosphate lithium polymer lithium ion battery

[0088] Manufacturing method of positive electrode sheet:

[0089] The cathode material lithium iron phosphate, the conductive agent Super P, the binder PVDF, and the solvent NMP were synthesized into a slurry in a weight ratio of 100:3:4.5:49, and coated on a 0.02mm thick aluminum foil. Cut the positive electrode strip into a kitchen knife shape: the area of ​​the main knife is 50×70mm 2 Dimensions, handle area is 5×7mm 2 Size, the knife handle is uncoated aluminum foil, and its surface will be spot-welded with an aluminum lead in the subsequent process.

[0090] Manufacturing method of negative electrode sheet:

[0091] Negative electrode material artificial stone black CMS, conductive agent, binder, and solvent were synthesized into a slurry in a weight ratio of 100:7:6:52, and coated on a 0.01 mm thick copper foil. Cut the negative electrode strip into a kit...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/38H01M4/36H01M4/58H01M4/48
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 王兴威沙永香唐琛明沈涛徐荷莲
Owner 江苏海四达电源有限公司
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