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A kind of positive electrode slurry of lithium ion battery and preparation technology thereof

A lithium-ion battery, cathode slurry technology, applied in electrode manufacturing, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of uneven dispersion of cathode slurry, poor rheology and stability, low production efficiency, etc. Good fluidity, increased solid content, and improved production efficiency

Inactive Publication Date: 2016-08-24
济宁市无界科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode material is an important part of lithium-ion batteries, accounting for 40% of the cost of lithium-ion batteries, and is also the key to determining the performance of lithium-ion batteries. Therefore, the quality of the positive electrode slurry is the key to ensuring the performance of lithium-ion batteries. Therefore, the development of Positive electrode slurry with sufficient and uniform mixing, high solid content, good fluidity, low price, no environmental pollution, and safe use has always been a hot spot of concern; however, the positive electrode slurry for lithium-ion batteries made by traditional processes is unevenly dispersed and has poor rheological properties. And the stability is poor, and the viscosity is high, the processing cost is high; in addition, the slurry coating of the positive electrode sheet of the lithium battery is generally relatively thick, the coating amount is large, the volatilization speed is slow, and the production efficiency is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Take 1313g of N-methylpyrrolidone (NMP) and add it to the mixing tank, then weigh 60g of polyvinylidene fluoride (PVDF) and 2.4g of polycaprolactone, and add them to the mixing tank while stirring. Revolution 80 rpm, autorotation 200 rpm, stir for 15 minutes, then increase the speed to revolution 500 rpm, autorotation 1000 rpm, stir for 3 hours;

[0021] 2. Then add 60g of conductive carbon black (Super-p), stir for 15 minutes at a stirring speed of 80 revolutions per minute and 200 revolutions per minute, then increase the speed to 500 revolutions per minute and 1000 revolutions per minute. points, stirring for 2h;

[0022] 3. Add 20g of conductive graphite (Ks-6), stir for 15min at a stirring speed of 80 revolutions per minute and 200 revolutions per minute, then increase the speed to 500 revolutions per minute and 1000 revolutions per minute. , stirred for 2h;

[0023] 4. Add 1860g of lithium manganate, stir for 28 minutes at a stirring speed of 100 rpm, 210 rpm...

Embodiment 2

[0028] 1. Take 857g of N-methylpyrrolidone (NMP) into the mixing tank, then weigh 40g of polyvinylidene fluoride (PVDF), 1g of polycaprolactone, and 2g of polycaprolactone polyol, and add them to the mixing tank while stirring. In the material tank, stir for 10 minutes at a stirring speed of 100 rpm and 300 rpm, then increase the speed to 680 rpm, rotate at 1250 rpm, and stir for 2.6 hours;

[0029] 2. Add 40g of conductive carbon black (Super-p), stir for 13 minutes at a stirring speed of 90 revolutions per minute and 280 revolutions per minute, then increase the speed to 700 revolutions per minute and 1300 revolutions per minute. points, stirring for 1.6h;

[0030] 3. Then add 20g of conductive graphite (Ks-6), stir for 10min at a stirring speed of 120 rpm and 300 rpm, then increase the speed to 700 rpm and 1200 rpm , stirred for 1.7h;

[0031] 4. Add 1900g of ternary material, stir for 20 minutes at a stirring speed of 100 rpm, 300 rpm, and then increase the speed to 700 ...

Embodiment 3

[0036] 1. Take 1636g of N-methylpyrrolidone (NMP) into the mixing tank, then weigh 75g of polyvinylidene fluoride (PVDF), 4g of polycaprolactone, and 2g of monoglyceride stearate, and add them to the mixing tank while stirring. In the feed tank, stir for 8 minutes at a stirring speed of 200 revolutions per minute and 400 revolutions per minute, then increase the speed to 800 revolutions per minute, rotate at 1500 revolutions per minute, and stir for 2 hours;

[0037] 2. Add 40g of conductive carbon black (Super-p), stir for 8 minutes at a stirring speed of 200 rpm and 400 rpm, then increase the speed to 800 rpm and 1300 rpm. points, stirring for 1.8h;

[0038] 3. Then add 20g of conductive graphite (Ks-6), stir for 8 minutes at a stirring speed of 200 rpm and 400 rpm, then increase the speed to 700 rpm and 1500 rpm , stirred for 1h;

[0039] 4. Add 1860g of lithium iron phosphate, stir at a stirring speed of 200 rpm and 400 rpm, stir for 15 minutes, then increase the speed t...

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Abstract

The invention discloses a lithium ion battery positive paste and its preparation technology. The lithium ion battery positive paste is prepared by mixing a solid material with a solvent, and the solid material comprises 92-95wt% of a positive material, 2-4wt% of a conductive agent, 1-3wt% of an adhesive and 0.1-0.3wt% of an additive; and the additive is one of or a mixture containing above two of glycerol monostearate, polycaprolactone polyol, polycaprolactone and glyceryl tripropanoate. The invention also discloses the preparation technology of the lithium ion battery positive paste. Compared with traditional preparation technologies of lithium ion battery pastes, the preparation technology disclosed in the invention adopting some additives reduces the viscosity of the original positive paste, reduces the viscosity by 10-60% under a same solid content, improves the solid content by 3-10% under same viscosity, saves 15-35% of a solvent, and correspondingly reduces the processing cost.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a positive electrode slurry of a lithium ion battery and a preparation process thereof. Background technique [0002] Traditional secondary batteries mainly include lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, etc., which cannot meet the needs of the market due to problems such as low energy density and environmental pollution. Lithium-ion batteries have many advantages as a new type of green power supply. Excellent performance, such as high energy density, long cycle life, high open circuit voltage, no memory effect, safety and pollution-free, etc. After nearly two decades of rapid development, lithium-ion batteries have been widely used in electric vehicles, electric tools, energy storage power stations, mobile phones, notebook computers, digital cameras and other fields. The positive electrode material is an important part of lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62H01M4/04H01M4/139
CPCH01M4/13H01M4/139H01M4/62H01M10/0525Y02E60/10
Inventor 贺兆书李俊峰程继灿蒋宁
Owner 济宁市无界科技有限公司