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A lithium ion battery positive electrode bind and application thereof

A lithium-ion battery and binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low adhesion, insoluble, and reduced flexibility, and achieve improved electronic conductivity and ionic conductivity. The effect of high rate and low internal resistance

Inactive Publication Date: 2018-12-07
河南电池研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the molecular weight is low, the cohesive force is small, and when the molecular weight is too large, the cohesive degree is high but the flexibility will be reduced, and it is also difficult to dissolve

Method used

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  • A lithium ion battery positive electrode bind and application thereof
  • A lithium ion battery positive electrode bind and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Dissolve the binder P1 (polyvinylidene fluoride with a molecular weight of 3000~50,000) in NMP and stir to form a transparent, bubble-free glue, then add conductive carbon black and positive electrode active materials to the glue in turn, after high-speed Stir, disperse, and suction filter to form a positive electrode slurry with uniformity, moderate viscosity, no graininess and good fluidity.

[0013] After coating, baking, sheeting, rolling, slitting, winding, shelling, spot welding, baking, liquid injection, and sealing, the 18650 lithium-ion battery is formed.

[0014] Carry out formation and cycle tests at a rate of 0.1~1C, and test the internal resistance voltage of the battery after formation.

Embodiment 2

[0016] The binder P2 (polyvinylidene fluoride with a molecular weight of 100,000 to 300,000) was dissolved in NMP and stirred to form a transparent, bubble-free glue solution, and then conductive carbon black and positive electrode active materials were added to the glue solution in sequence. High-speed stirring, dispersing, and suction filtration form a positive electrode slurry with uniformity, moderate viscosity, no graininess and good fluidity.

[0017] After coating, baking, sheeting, rolling, slitting, winding, shelling, spot welding, baking, liquid injection, and sealing, the 18650 lithium-ion battery is formed.

[0018] Carry out formation and cycle tests at a rate of 0.1~1C, and test the internal resistance voltage of the battery after formation.

Embodiment 3

[0020] The binder P5 (polyvinylidene fluoride with a molecular weight of 300,000 to 500,000) was dissolved in NMP and stirred to form a transparent, bubble-free glue, and then conductive carbon black and positive active materials were added to the glue in turn. High-speed stirring, dispersing, and suction filtration form a positive electrode slurry with uniformity, moderate viscosity, no graininess and good fluidity.

[0021] After coating, baking, sheeting, rolling, slitting, winding, shelling, spot welding, baking, liquid injection, and sealing, the 18650 lithium-ion battery is formed.

[0022] Carry out formation and cycle tests at a rate of 0.1~1C, and test the internal resistance voltage of the battery after formation.

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Abstract

The invention discloses a lithium ion battery positive electrode binder and an application thereof, belonging to the technical field of optimizing the selection of the lithium ion battery binder. A lithium ion battery positive electrode binder is prepared from polyvinylidene fluoride with molecular weight of 500,000-700,000. The invention also discloses the application of the positive electrode binder of the lithium ion battery in preparing the lithium ion battery. As that polyvinylidene fluoride bind with a specific molecular weight is selected, the internal resistance aft the battery is formed is relatively minimum, the ionic conductivity of the pole piece is highest, the ionic and electronic conductivity of the cathode material can be effectively improved, the adhesion is enhance, and the resilience of the pole piece is inhibited.

Description

technical field [0001] The invention belongs to the technical field of optimization and selection of lithium-ion battery binders, and in particular relates to a lithium-ion battery cathode binder and its application. Background technique [0002] Lithium-ion batteries have many advantages such as large specific capacity, good cycle performance, and small size. They have been widely used in the electronic field and become the best choice for electric vehicle power batteries. The demand is growing day by day. Positive electrode materials, negative electrode materials, electrolytes and separators are the key components of lithium-ion batteries. The positive and negative active materials, conductive agents and binders are made into active slurry, and then evenly coated on aluminum foil / copper foil, after baking, rolling, sheeting and other processes, and finally after winding, shelling, injection Liquid and other processes to form lithium-ion batteries. As one of the importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/623H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 杨书廷马梦月荆汝壹董红玉
Owner 河南电池研究院有限公司
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