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CNT-containing lithium ion battery waterborne positive electrode paste and preparation method therefor

A cathode slurry, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as affecting the health of workers in the production workshop, large specific surface area of ​​CNTs, and high toxicity on the production site, so as to avoid environmental pollution. and poor safety, small battery polarization, and the effect of reducing material costs

Active Publication Date: 2016-05-04
HEFEI HENGNENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CNT has a large specific surface area, which is prone to agglomeration and is not easy to disperse evenly in solvents.
[0004] In addition, water and NMP (N-methylpyrrolidone) are generally used as solutions at present, but due to the high polarity of water and NMP, and the polarity of H2O is higher than that of NMP, it is more difficult for CNT to disperse in aqueous slurry
[0005] Third, because NMP is volatile, flammable, explosive, and highly toxic, it is easy to cause serious environmental pollution, which makes the production site highly toxic and seriously affects the health of the production workshop staff.

Method used

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  • CNT-containing lithium ion battery waterborne positive electrode paste and preparation method therefor
  • CNT-containing lithium ion battery waterborne positive electrode paste and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Add 25kg of carbon nanotube dispersion, 3kg of conductive agent carbon black and 10% of 100kg of deionized water into a double planetary mixer and stir for 20 minutes. The dispersion speed of the double planetary mixer is 500±20rpm, revolution 20± 1 rpm;

[0031] (2) Add 3 / 5 of 70kg of lithium iron phosphate to the mixture in (1), stir for 20 minutes, then add the remaining lithium iron phosphate and 10% of deionized water and stir for 30 minutes;

[0032] (3) Add 2kg of water-based binder LA132 to the mixed material in (2). The double planetary mixer stirs at a dispersion speed of 500rpm and a revolution of 2rpm for 5min, then at a dispersion speed of 1000rpm and a revolution of 20rpm for 30min, and finally at a dispersion speed of Stir at 4500rpm and revolution at 35rpm for 4h;

[0033] (4) Add the remaining deionized water to the mixed material in (3), so that the solid content in the material is 50%, and stir for 40 minutes at a dispersion speed of 4500±20rpm a...

Embodiment 2

[0041] (1) Add 30kg of carbon nanotube dispersion liquid, 2kg of conductive agent (acetylene black, carbon black mass ratio is 1:1) and 20% of 120kg of deionized water into a double planetary mixer and stir for 40min. The double planetary mixer The dispersion speed is 500±20rpm, and the revolution is 20±1rpm;

[0042] (2) Add 3 / 5 of 64kg lithium iron phosphate to the mixture in (1), stir for 40 minutes, then add the remaining lithium iron phosphate and 5% of deionized water and stir for 10 minutes;

[0043] (3) Add 4kg of water-based binder LA135 to the mixed material in (2). The double planetary mixer stirs at a dispersion speed of 500rpm and a revolution of 2rpm for 20min, then at a dispersion speed of 1000rpm and a revolution of 20rpm for 30min, and finally at a dispersion speed of Stir at 4500rpm and revolution at 35rpm for 4h;

[0044] (4) Add the remaining deionized water to the mixed material in (3), so that the solid content of the material is 60%, and stir for 40 min...

Embodiment 3

[0047] (1) Add 28kg of carbon nanotube dispersion, 1kg of conductive agent Ketjen black and 15% of 110kg of deionized water into a double planetary mixer and stir for 30 minutes. The dispersion speed of the double planetary mixer is 500±20rpm, revolution 20 ±1rpm;

[0048] (2) Add 3 / 5 of the 70kg lithium iron phosphate to the mixture in (1), stir for 30 minutes, then add the remaining lithium iron phosphate and 8% in deionized water and stir for 20 minutes;

[0049] (3) Add 1kg of water-based binder LA133 to the mixed material in (2), stir with the double planetary mixer at a dispersion speed of 500rpm and a revolution of 2rpm for 10min, then stir at a dispersion speed of 1000rpm and a revolution of 20rpm for 30min, and finally Stir at 4500rpm, revolution at 35rpm for 4h;

[0050] (4) Add the remaining deionized water to the mixed material in (3), so that the solid content in the material is 55%, and stir for 30 minutes at a dispersion speed of 4500±20rpm and a revolution of ...

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Abstract

The invention discloses a CNT-containing lithium ion battery waterborne positive electrode paste and a preparation method therefor. The CNT-containing lithium ion battery waterborne positive electrode paste is prepared from the following components in parts by weight: 60-70 parts of lithium iron phosphate, 0.8-3 parts of conductive agent, 1-4 parts of waterborne binder, 25-30 parts of carbon nanotube dispersion liquid and deionized water; the sum of the parts by weight of lithium iron phosphate, conductive agent, waterborne binder and carbon nanotube dispersion liquid are 100 parts; and due to the usage of the deionized water, 50-60% of solid content in the waterborne positive electrode paste is obtained. According to the CNT-containing lithium ion battery waterborne positive electrode paste and the preparation method therefor, the deionized water is used as solvent for improving the fluidity of the (carbon nanotube) CNT, lowering the CNT viscosity and improving the CNT dispersion, so that the paste with improved viscosity, thinness and solid content is obtained.

Description

technical field [0001] The invention belongs to the field of preparation of iron phosphate lithium ion battery slurry, and more specifically, the invention relates to a lithium ion battery aqueous positive electrode slurry in which CNTs are well dispersed and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary rechargeable battery. It mainly relies on lithium ions to move between the positive electrode and the negative electrode. Li+ is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as the positive electrode material, and the positive electrode material also contains dispersants, conductive agents, binders, and solvents. Carbon nanotube (CNT) is a newly emerging conductive age...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 武玉哲刘欣刘琦
Owner HEFEI HENGNENG NEW ENERGY TECH
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