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Method for testing button type half cell made of lithium ion battery electrode material

A lithium-ion battery and electrode material technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc. Storage capacity, optimized battery assembly process, environmentally safe and friendly effects

Active Publication Date: 2022-04-12
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor consistency of the specific capacity of the button half battery, low first effect, and poor cycle effect, the present invention proposes a method for making a button half battery from the electrode material of a lithium ion battery for testing, and improves the consistency of the specific capacity of the button half battery sexual and circular effects

Method used

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  • Method for testing button type half cell made of lithium ion battery electrode material
  • Method for testing button type half cell made of lithium ion battery electrode material
  • Method for testing button type half cell made of lithium ion battery electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1, lithium iron phosphate as active material:

[0066] 1) Vacuum bake the lithium iron phosphate material to be tested in an oven at 120°C for 4 hours; bake Super P and KS-15 in an oven at 120°C for 12 hours, and bake PVDF in an oven at 80°C for 12 hours. :KS-15:PVDF:NMP=2.75:1.1:3:112.75 ratio to prepare a slurry, after vacuum stirring for 4 hours to obtain a uniform slurry A.

[0067] 2) According to the ratio of lithium iron phosphate: slurry A=9.315:11.9600, weigh the lithium iron phosphate material and the slurry into a ball mill jar, and add agate ball milling beads φ6:15 and φ10:8. After putting the ball mill jar into the ball mill, run it at 200r / min for 5min, then adjust the speed to 500r / min for 1h.

[0068] 3) After the ball milling, pour the obtained slurry on the clean and dry aluminum foil, adjust the scraper to 180-200μm, scrape the slurry evenly on the aluminum foil, dry the NMP at 120°C, and put it in a vacuum oven at 120°C Dry for 3h. The...

Embodiment 2

[0082] Embodiment 2: Ternary material is used as active material:

[0083] 1) According to the ratio of ternary material: slurry A (obtained in Example 1) = 9.315:11.9600, weigh the ternary material and slurry into a ball mill jar, and add agate ball milling beads φ6:15 and φ10:8. After putting the ball mill jar into the ball mill, run it at 200r / min for 5min, then adjust the speed to 500r / min for 1h.

[0084] 2) After ball milling, pour the resulting slurry on a clean and dry aluminum foil, adjust the scraper to 180-200 μm, scrape the slurry evenly on the aluminum foil, dry the NMP at 120°C, and put it in a vacuum oven at 120°C Dry for 3h. The surface capacity of the obtained electrode should be controlled at 1-3mAh / cm².

[0085] 3) Take the pole piece obtained above out of the oven and cut off the blank aluminum foil, clean the surface until it is dust-free, adjust the rollers for 50μm, 40μm, and 30μm rolling once respectively, and control the compaction density of the pol...

Embodiment 3

[0098] Example 3, the active site is graphite negative electrode material.

[0099]1) Bake the graphite anode material to be tested in an oven at 80°C for 1 hour; bake Super P in an oven at 120°C for 12 hours, and bake PVDF in an oven at 80°C for 12 hours. The ratio of 1:5:138 was weighed, the slurry was prepared, and the slurry was stirred for 4 hours to obtain the slurry B.

[0100] 2) Weigh an appropriate amount of graphite material: slurry B into a 100ml ball mill jar according to the ratio of 9.4:14.4, and add agate ball mill beads φ6:15 and φ10:8. After putting the ball mill jar into the ball mill, run it at 200r / min for 5min, then adjust the speed to 500r / min for 1h.

[0101] 3) After the ball milling, pour the obtained slurry on the clean and dry copper foil, adjust the scraper to 200μm, scrape the slurry evenly on the copper foil, dry the NMP at 120°C, and put it in a vacuum oven at 100°C Dry for 3h.

[0102] 4) Take the pole piece obtained above out of the oven an...

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Abstract

The invention belongs to the technical field of lithium ion batteries, particularly relates to a method for testing a button type half battery made of a lithium ion battery electrode material, and belongs to the field of lithium batteries. The technical scheme adopted by the invention is as follows: the method comprises the processes of manufacturing a pole piece and assembling a button type half cell, namely putting a clean base material on an infrared flat plate coating machine, uniformly coating slurry on the base material, drying the pole piece by the coating machine, baking by a vacuum oven to remove moisture, cutting off a blank base material, sequentially rolling the pole piece once at roller gaps of 50mu m, 40mu m and 30mu m of a double-roller machine, and assembling the button type half cell after the pole piece is rolled once at the roller gaps of 50mu m, 40mu m and 30mu m of the double-roller machine. Making the pole piece into a circular pole piece, pasting the circular pole piece on a gasket by using a small amount of conductive adhesive, drying the circular pole piece to serve as a pole piece sheet, placing the negative pole shell of the button-type half cell on a flat operation table in a closed environment, and putting an elastic sheet into the operation table; after six drops of electrolyte are added, a gasket and a pole piece are added, then three drops of electrolyte are added to wet (increase) a pole piece dressing, a diaphragm is attached to the pole piece, a lithium piece is placed and slightly pressed, a positive pole shell is covered, the lithium piece is placed in a sealing machine to be sealed at the pressure of 800 psi, and the button type half-cell sample for material testing is obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for making a button-type half-battery from lithium-ion battery electrode materials for testing. Background technique [0002] Lithium-ion batteries have been widely used due to the advantages of small size, light weight, environmental friendliness, and high specific energy. Only positive electrode materials on the market include lithium iron phosphate materials, lithium titanate, lithium manganate, ternary nickel cobalt lithium manganate and other types. The negative electrode material is divided into graphite, lithium titanate, silicon carbon negative electrode and other types. These materials have been widely used at home and abroad due to their own performance advantages or price advantages. In addition to testing the performance of existing materials, laboratory button batteries are also used for preliminary electrochemical performance tes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385
Inventor 张霞田晨杜显振
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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