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Method for improving surface of polymer lithium ion battery

A technology of lithium-ion batteries and polymers, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, sustainable manufacturing/processing, etc., can solve the problems of easy wrinkling, easy deformation, poor flexibility, etc., and achieve reduced production costs and long life , The effect of stable discharge

Inactive Publication Date: 2017-01-18
深圳市言九电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultra-thin batteries have poor hardness, poor flexibility, easy deformation, and easy wrinkling because they are too thin; this affects the discharge performance and appearance of the battery.
Foreign manufacturers usually use gel electrolyte to solve this defect, but there is no domestic manufacturer to produce this electrolyte, and this solution makes the battery production cost high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Pour 400 grams of methanol into the mixing tank and stir, adjust the speed of the mixer to 700rpm, slowly add 50 grams of alcohol-soluble polyacrylic resin and 190 grams of thermoplastic aldol resin, stir for 30 minutes; add 2 grams of defoamer and 5 grams of leveling agent ; Then continue to add methanol to dilute the viscosity of the solution system, and then stir for 15 minutes to obtain the required resin solution.

[0026] Spray the obtained resin solution evenly between the ultra-thin battery aluminum, copper foil and aluminum-plastic film with a spray gun; bake in an oven at 85°C, and the resin will dry after 4 hours, and assemble the battery according to the normal process. The assembled ultra-thin battery has high hardness and good flexibility. After bending it along the midline and folding the cut surface at an angle of 120°, the battery is restored to a normal state. After recovery, the battery is flat and has no wrinkles, and the aluminum-plastic film has no ...

Embodiment 2

[0028] Pour 400 grams of ethanol into the mixing tank and stir, adjust the speed of the mixer to 800rpm, slowly add 450 grams of alcohol-soluble polyacrylic acid resin, and stir for 20 minutes; add 1 gram of defoamer and 3 grams of leveling agent; then add ethanol to dilute and adjust the viscosity of the system, After stirring for another 15 minutes, the required resin solution was obtained; marked as resin 1.

[0029] According to the above conditions, mix 75 grams of polyvinylidene fluoride and 200 grams of polyacrylic acid resin into 400 grams of acetone, add 1.1 grams of defoamer and 1.5 grams of leveling agent; then add solvent acetone to adjust the viscosity of the system, and then stir for 15 minutes. The required resin solution was obtained; designated as resin 2.

[0030] Spray resin 1 uniformly between the aluminum foil of the ultra-thin battery positive plate and the aluminum-plastic film with a spray gun; spray resin 2 evenly with a spray gun between the metal lit...

Embodiment 3

[0032] Mix 900 grams of ethanol and 100 grams of propylene glycol; take 400 grams of the mixed solution and stir it on a variable speed mixer, and adjust the speed to 1000 rpm; slowly add 50 grams of thermoplastic phenolic resin and 200 grams of alcohol-soluble nylon, and stir for 10 minutes; add 2 grams of defoamer and 4 grams of leveling agent; then add a mixed solution of ethanol and propylene glycol to dilute and adjust the viscosity of the system, and then stir for 15 minutes to obtain the required resin solution, which is designated as resin 1.

[0033] According to the above conditions, mix 60 grams of polyvinylidene fluoride and 120 grams of polyacrylic acid resin into 400 grams of N-methylpyrrolidone, add 1 gram of leveling agent after stirring; add N-methylpyrrolidone to adjust the viscosity, and then stir for 15 minutes After that, the required resin solution can be obtained, which is designated as resin 2.

[0034] Use a spray gun to spread resin 1 evenly between t...

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PUM

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Abstract

The invention discloses a method for improving surface of a polymer lithium ion battery. The method comprises the following steps: a) taking an alcohols or ketones substance as a solvent, slowly adding one or more alcohol-soluble or ketone-soluble resin in the solvent while stirring the solvent at high speed in a normal temperature state, wherein the stirring time is 10-30 min; b) adding an antifoaming agent and a levelling agent in the above mixing solution, and uniformly stirring the materials; c) continuously adding the alcohols or ketones solvent for adjust the viscosity of the mixing solution, stirring the materials for 15-30 min to obtain a resin solution; d) uniformly spraying the prepared resin solution on an intermediate part between an ultrathin battery pole piece and a plastic-aluminum membrane by a spray gun; and e) drying the processed ultrathin battery in the step d). The method is used for the manufacturing process field of the polymer lithium ion battery.

Description

technical field [0001] The invention relates to a method for battery surface, in particular to a method for improving the surface of polymer lithium ion battery. Background technique [0002] The principle of polymer lithium-ion batteries is the same as that of liquid lithium, the main difference is that the electrolyte is different from liquid lithium. The main structure of the battery includes three elements: positive electrode, negative electrode and electrolyte. The so-called polymer lithium-ion battery means that at least one or more of the three main structures use polymer materials as the main battery system. In the currently developed polymer lithium-ion battery system, polymer materials are mainly used in positive electrodes and electrolytes. The positive electrode material includes conductive polymers or inorganic compounds used in general lithium-ion batteries. The electrolyte can use solid or colloidal polymer electrolytes, or organic electrolytes. Generally, l...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 王华平曾立平
Owner 深圳市言九电子科技有限公司
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