Manufacturing method of battery positive plate

A manufacturing method and battery positive electrode technology, applied in electrode manufacturing, battery electrodes, lithium storage batteries, etc., can solve problems such as harmful to human body and environment, and achieve the effects of reducing production costs, shortening pulping time, and excellent performance

Active Publication Date: 2020-01-24
深圳中华自行车(集团)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The binder of the above-mentioned lithium battery uses polyvinylidene fluoride, and the solvent is NMP. Such binders and solvents are prone to produce harmful substances to the human body and the environment, and need to be improved.

Method used

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  • Manufacturing method of battery positive plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for making a positive electrode sheet of a battery, such as figure 1 shown, including the following steps:

[0037] S1 pulping: in parts by weight, first add 30 parts of water-based adhesive to the mixing tank, then add 70 parts of deionized water, stir and disperse at 90 rpm for 8 minutes, then add 7 parts of Super P, stir and disperse at 90 rpm for 8 minutes, Then stir and disperse at 1000rpm for 100min, then add 23 parts of deionized water and 160 parts of lithium manganate, stir and disperse at 90rpm for 8min, then stir and disperse at 900rpm for 25min, finally add 105 parts of lithium manganate and 15 parts of cerium nitrate, and stir at 90rpm Disperse for 8 minutes, then stir and disperse at 900rpm for 80 minutes, and use deionized water to adjust the viscosity to 4400mPa·s to obtain a slurry;

[0038] S2 film production: evenly coat the slurry on the aluminum foil, the winding speed is 8.5m / min, and the density of both sides of the positive pole piece i...

Embodiment 2

[0045] A method for making a positive electrode sheet of a battery, such as figure 1 shown, including the following steps:

[0046] S1 pulping: by weight, first add 34 parts of water-based adhesive to the mixing tank, then add 80 parts of deionized water, stir and disperse at 110rpm for 12min, then add 9 parts of Super P, stir and disperse at 110rpm for 12min, Then stir and disperse at 1400rpm for 140min, then add 27 parts of deionized water and 200 parts of lithium manganate, stir and disperse at 110rpm for 12min, then stir and disperse at 1100rpm for 35min, finally add 135 parts of lithium manganate and 20 parts of cerium nitrate, and stir at 110rpm Disperse for 12 minutes, then stir and disperse at 1100rpm for 100min, and use deionized water to adjust the viscosity to 4800mPa·s to obtain a slurry;

[0047] S2 film production: evenly coat the slurry on the aluminum foil, the winding speed is 8.5m / min, and the density of both sides of the positive pole piece is 5.8g / cm 2 , ...

Embodiment 3

[0054] A method for making a positive electrode sheet of a battery, such as figure 1 shown, including the following steps:

[0055] S1 pulping: in parts by weight, first add 32 parts of water-based adhesive to the mixing tank, then add 75 parts of deionized water, stir and disperse at 100rpm for 10min, then add 7.8 parts of Super P, stir and disperse at 100rpm for 10min, Then stir and disperse at 1200rpm for 120min, then add 25 parts of deionized water and 180 parts of lithium manganate, stir and disperse at 100rpm for 10min, then stir and disperse at 1000rpm for 30min, finally add 120 parts of lithium manganate and 18 parts of cerium nitrate, and stir at 100rpm Disperse for 10 minutes, then stir and disperse at 1000rpm for 90 minutes, and use deionized water to adjust the viscosity to 4600mPa·s to obtain a slurry;

[0056] S2 film production: evenly coat the slurry on the aluminum foil, the winding speed is 8.5m / min, and the density of both sides of the positive pole piece i...

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Abstract

The invention discloses a manufacturing method of a battery positive plate. According to the technical scheme, the method is characterized by comprising the following steps: S1, pulping, namely, adding 30-34 parts by weight of a waterborne adhesive into a stirring cylinder, adding 70-80 parts by weight of deionized water, carrying out stirring and dispersing for 8-12min at the speed of 90-110rpm,adding 7-9 parts by weight of a conductive agent, carrying out stirring and dispersing for 8-12min at the speed of 90-110rpm, carrying out stirring and dispersing for 100-140min at the speed of 1000-1400rpm, adding 23-27 parts by weight of deionized water and 160-200 parts by weight of lithium manganate, carrying out stirring and dispersing for 8-12min at the speed of 90-110rpm, carrying out stirring and dispersing for 25-35min at the speed of 900-1100rpm, adding 105-135 parts by weight of lithium manganate, carrying out stirring and dispersing for 8-12min at the speed of 90-110rpm, carrying out stirring and dispersing for 80-100min at the speed of 900-1100rpm, and adjusting the viscosity by using deionized water to obtain slurry; and S2, flaking, namely, uniformly coating an aluminum foilwith the slurry, and carrying out drying and compacting to obtain a positive plate. Because a waterborne polyurethane adhesive is used to manufacture the positive plate, the pulping time is shortened, the pulping process is simplified, the production cost is reduced, and environmental friendliness and no pollution are realized.

Description

technical field [0001] The invention relates to a battery, in particular to a method for making a battery positive electrode sheet. Background technique [0002] Lithium manganate battery refers to a battery that uses lithium manganate material as the positive electrode, and its voltage is 2.5V-4.2V. Lithium manganate battery is widely used for its low cost and good safety. The lithium battery includes a positive electrode structure and a negative electrode structure. The positive electrode structure of the lithium manganate battery is made by mixing lithium manganate, conductive agent, solvent and binder, coating it on the current collector, and drying it. Commonly used conductive agents include carbon-based conductive agents, including acetylene black, conductive carbon black, Super P, etc.; commonly used solvents are NMP; commonly used binder systems are PVDF systems, that is, polyvinylidene fluoride-oily systems. [0003] The Chinese patent with the notification number ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/1391H01M4/04H01M10/052
CPCH01M4/0404H01M4/1391H01M4/622H01M10/052Y02E60/10
Inventor 林培颖
Owner 深圳中华自行车(集团)股份有限公司
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