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A kind of lithium-ion battery cathode slurry and its water-based polyurethane/polyaniline binder

A lithium-ion battery, water-based polyurethane technology, applied in battery electrodes, polyurea/polyurethane coatings, secondary batteries, etc., can solve the problems of large environmental pollution, non-negligible effect, poor adhesion, etc., and achieve good cycle and rate performance. , The effect of ensuring mechanical stability and high toughness adhesion

Active Publication Date: 2018-04-03
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyaniline still needs a large amount of organic solvents when used as an adhesive, such as N-methylpyrrolidone, which has great environmental pollution and high cost; and although a single polyaniline has certain bonding properties, it is difficult to satisfy the bonding effect. Moreover, polyaniline is a rigid polymer with poor flexibility, which is not conducive to the stability and safety of the battery
[0005] At present, there are few studies on binders for battery positive electrode materials. Although the amount of binders is small, the role played cannot be ignored, and the existing battery binders have serious pollution, poor adhesion, large impedance, and specific energy. low technical issues

Method used

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  • A kind of lithium-ion battery cathode slurry and its water-based polyurethane/polyaniline binder
  • A kind of lithium-ion battery cathode slurry and its water-based polyurethane/polyaniline binder
  • A kind of lithium-ion battery cathode slurry and its water-based polyurethane/polyaniline binder

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Effect test

Embodiment 1

[0048] The present invention proposes a water-based polyurethane / polyaniline adhesive for positive electrode slurry of a lithium ion battery. The weight ratio of non-volatile matter in the emulsion is 90:10.

[0049] The present invention also proposes a positive electrode slurry for lithium ion batteries, whose raw materials include in parts by weight: 19.81g of water-based polyurethane / polyaniline adhesive for the positive electrode slurry of lithium ion batteries, 40g of lithium iron phosphate, 5g of conductive agent, and Wetting agent 0.5g, water-based defoamer 0.5g, water-based anti-settling agent 0.5g, deionized water 40.19g.

[0050] The present invention also proposes a method for preparing the positive electrode slurry of the lithium ion battery. After the positive electrode slurry of the lithium ion battery is mixed with a water-based polyurethane / polyaniline adhesive, lithium iron phosphate and a conductive agent, deionized water is added as a dispersant , then add...

Embodiment 2

[0054] The present invention proposes a water-based polyurethane / polyaniline adhesive for positive electrode slurry of a lithium ion battery. The weight ratio of non-volatile matter in the emulsion is 50:50.

[0055] The present invention also proposes a lithium ion battery cathode slurry, whose raw materials include by weight: 41.86g of water-based polyurethane / polyaniline adhesive for the above lithium ion battery cathode slurry, 40g of lithium iron phosphate, 5g of conductive agent, water-based Wetting agent 0.5g, water-based defoamer 0.5g, water-based anti-settling agent 0.5g, deionized water 18.12g.

[0056] The present invention also proposes a method for preparing the positive electrode slurry of the lithium ion battery. After the positive electrode slurry of the lithium ion battery is mixed with a water-based polyurethane / polyaniline adhesive, lithium iron phosphate and a conductive agent, deionized water is added as a dispersant , then add a water-based wetting agent...

Embodiment 3

[0060] The present invention proposes a water-based polyurethane / polyaniline adhesive for positive electrode slurry of a lithium ion battery. The weight ratio of non-volatile matter in the emulsion is 20:80.

[0061] The present invention also proposes a positive electrode slurry for lithium ion batteries, whose raw materials include by weight: 58.42g of water-based polyurethane / polyaniline adhesive for the positive electrode slurry of lithium ion batteries, 40g of lithium iron phosphate, 5g of conductive agent, water-based Wetting agent 0.5g, water-based defoamer 0.5g, water-based anti-settling agent 0.5g, deionized water 1.58g.

[0062] The present invention also proposes a method for preparing the positive electrode slurry of the lithium ion battery. After the positive electrode slurry of the lithium ion battery is mixed with a water-based polyurethane / polyaniline adhesive, lithium iron phosphate and a conductive agent, deionized water is added as a dispersant , then add a...

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Abstract

The invention discloses a water-based polyurethane / polyaniline adhesive for positive electrode slurry of a lithium ion battery. The raw materials thereof include water-based polyurethane emulsion and water-based polyaniline emulsion. The invention also discloses a lithium ion battery cathode slurry. The invention also discloses a preparation method of the positive electrode slurry of the lithium ion battery. The invention also discloses a preparation method of the lithium-ion battery cathode sheet. The invention also discloses a button lithium ion battery. The above-mentioned water-based polyurethane / polyaniline adhesive for lithium-ion battery positive electrode slurry proposed by the present invention has good environmental protection, high toughness and excellent adhesion, and small impedance. Compared with the prior art, the button battery made by the aniline adhesive has larger battery capacity and better cycle and rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a water-based polyurethane / polyaniline adhesive for lithium-ion battery positive slurry, lithium-ion battery positive slurry and a preparation method thereof, lithium-ion battery positive pole piece and a preparation method thereof , and a button lithium-ion battery. Background technique [0002] Currently, polyvinylidene fluoride (PVDF) is the most commonly used binder for positive electrode slurry of lithium ion batteries. However, the use of PVDF requires a large amount of organic solvents such as N-methylpyrrolidone (NMP), N, N-dimethylformamide (DMF), etc., and the pollution is relatively large; and due to the poor bond fastness of the oil-based adhesive, The fatigue resistance is low and the flexibility is poor, which leads to powder removal at the edge of the pole piece during the slitting and reordering process of the rolled pole piece, resulting in a signi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/139H01M4/62C09D175/04C09D179/02
CPCC09D175/04C09D179/02H01M4/139H01M4/62H01M4/622H01M10/0525C08L79/02C08L75/04Y02E60/10
Inventor 鲍俊杰陶灿许戈文黄毅萍朱春柳金森罗珍高明昊
Owner ANHUI UNIVERSITY
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