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Lithium battery electrode sheet and preparation method thereof

A technology of electrode sheets and lithium batteries, which is applied in the direction of battery electrodes, electrode manufacturing, non-aqueous electrolyte battery electrodes, etc., can solve problems such as burrs and dust, hidden dangers of battery safety performance, etc., to prevent direct contact, extend mold life, and prolong use The effect of longevity

Active Publication Date: 2019-01-04
成都市银隆新能源产业技术研究有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium-ion battery multi-pole tabs occupy a higher and higher position in lithium-ion batteries, especially the current square shell lithium-ion batteries, almost all use the structure of the pole piece, but the pole piece needs to be die-cut or laser cut If there are multiple tabs, it is easy to produce tiny burrs and dust during the die-cutting or laser cutting process, which will cause hidden dangers to the safety performance of the battery
Related technologies are difficult to improve the above problems, and in the subsequent handling and assembly process, secondary powder falling and burrs are unavoidable

Method used

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  • Lithium battery electrode sheet and preparation method thereof
  • Lithium battery electrode sheet and preparation method thereof

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preparation example Construction

[0017] The preparation method of the lithium battery electrode sheet provided by the present invention includes: preparing an active material layer and preparing a ceramic coating, wherein the preparation of the active material layer includes applying the active slurry to the current collector and drying, so that the surface of the current collector is active. Material layer, preparing the ceramic coating includes coating the ceramic slurry on one side of the active material layer of the current collector and drying; it should be noted that the above-mentioned coating of the ceramic slurry on one side of the active material layer of the current collector Specifically, the ceramic slurry can be coated on the edge of the active material layer on the current collector to form a figure 1 As shown in the electrode sheet, the active material layer 3 and the ceramic coating 2 are sequentially distributed on the surface of the current collector 1 .

[0018] When it is necessary to die...

Embodiment 1

[0048] Prepare the raw materials of positive electrode slurry according to the following mass percentages: 62% nickel cobalt lithium manganate, 1.5% polyvinylidene fluoride, 1% carbon nanotubes, 1% conductive carbon black and 34.5% N-methylpyrrolidone .

[0049] Add polyvinylidene fluoride to N-methylpyrrolidone and stir evenly. After polyvinylidene fluoride is dissolved, add carbon nanotubes and conductive carbon black. After stirring evenly, add nickel-cobalt lithium manganate and stir evenly (2h), adjust The viscosity of the slurry is 5000mpa·s.

[0050] Prepare the raw materials of ceramic slurry according to the following mass percentages: 60% nano-scale aluminum oxide ceramic powder, 5% polyvinylidene fluoride, 0.1% sodium carboxymethyl cellulose, 0.5% polyvinylpyrrolidone, 34.4% N-methylpyrrolidone.

[0051] Mix N-methylpyrrolidone and polyvinylidene fluoride, stir to make a glue, control the viscosity of the glue to 200mpa s, add sodium carboxymethylcellulose and pol...

Embodiment 2

[0054] Prepare the raw materials of the negative electrode slurry according to the following mass percentages: 50% nanoscale lithium titanate, 2.5% polyvinylidene fluoride, 1% carbon nanotubes, 1% conductive carbon black and 45.5% N-methylpyrrolidone .

[0055] Add polyvinylidene fluoride to N-methylpyrrolidone and stir evenly. After polyvinylidene fluoride is dissolved, add carbon nanotubes and conductive carbon black. After stirring evenly, add nanoscale lithium titanate and stir evenly (2h), adjust The viscosity of the slurry is 6000mpa·s.

[0056] Prepare the raw materials of ceramic slurry according to the following mass percentages: 60% boehmite powder, 5% polyvinylidene fluoride, 0.1% sodium carboxymethyl cellulose, 0.6% polyvinylpyrrolidone, 34.3% N-methyl pyrrolidone.

[0057] Mix N-methylpyrrolidone and polyvinylidene fluoride, stir to make a glue, control the viscosity of the glue to 400mpa s, add sodium carboxymethylcellulose and polyvinylpyrrolidone, stir for 1 ...

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Abstract

A lithium battery electrode sheet comprise an active material layer prepare by coating an active slurry on a current collector and drying that active slurry so that a surface of the current collectorhas an active material layer, and a ceramic coat prepared by coating an active slurry on the active slurry and drying the active slurry. Preparing a ceramic coating comprising coating a ceramic slurryon one side of a current collector active material layer and drying; The electrode sheet prepared by the method can remarkably reduce burrs and dust generated in the process of die cutting or laser cutting, and is helpful for prolonging the service life of die cutting equipment or laser cutting tool; The electrode piece can also effectively reduce the direct contact between the two stages and reduce the possibility of short circuit, so as to improve the safety of the battery using the electrode piece and improve the qualification rate of the product.

Description

technical field [0001] The invention relates to the field of battery technology, and in particular to a lithium battery electrode sheet and a preparation method thereof. Background technique [0002] As one of the driving forces for the development of new energy, lithium-ion batteries have great market advantages such as environmental protection, good performance, and excellent comprehensive performance, so they are widely used in all aspects of life. However, with the development of the market, lithium The requirements for ion batteries are getting higher and higher, especially for the safety and cruising range of lithium-ion batteries. [0003] Lithium-ion battery multi-tab pole pieces occupy a higher and higher position in lithium-ion batteries, especially the current square-shell lithium-ion batteries, almost all use pole pieces of this structure, but the pole pieces need to be die-cut or laser cut If there are multiple tabs, it is easy to produce tiny burrs and dust du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04H01M4/13H01M4/139H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M4/62H01M10/0525Y02E60/10
Inventor 丁丽平陈海廷高峰
Owner 成都市银隆新能源产业技术研究有限公司