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A kind of preparation method of rate type lithium ion battery

A lithium-ion battery and rate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of inability to take into account battery rate performance and safety performance, and achieve improved battery safety performance, reduced polarization, and strong adhesion. Effect

Active Publication Date: 2017-03-01
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the shortcomings of the prior art that cannot balance the battery rate performance and safety performance, the purpose of the present invention is to provide a lithium-ion battery with good rate performance and high safety performance

Method used

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  • A kind of preparation method of rate type lithium ion battery
  • A kind of preparation method of rate type lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0014] A preparation method of a rate type lithium-ion battery, comprising the following steps:

[0015] 1. Weigh 1000 grams of N-methylpyrrolidone NMP as an oily solvent, 35 grams of polyvinylidene fluoride PVDF as a binder, stir evenly to obtain a uniform and stable binder system; then add 44 grams of nano-conductive carbon composite Conductive agent (hollow carbon spheres 2g, carbon black 7g, SP35g), and then ultrasonically dispersed for 2 hours, and finally 300g of NMP was added to adjust the viscosity, and finally an oily nano conductive primer solution A with a viscosity of 2000mPas was obtained.

[0016] 2. Weigh 20 g of δ-valerolactone and add it into 100 g of polyvinylidene fluoride, and disperse it ultrasonically for 2 hours to obtain a uniform and stable film-forming agent dispersion B.

[0017] 3. Coat the surface of the aluminum foil current collector with oily nano-conductive primer A (thickness: 1 µm) by gravure printing technology, and dry it; after that, coat ...

Embodiment 2

[0020] 1. Weigh 1000 grams of N-methylpyrrolidone NMP as an oily solvent, 30 grams of polyvinylidene fluoride PVDF as a binder, stir evenly to obtain a uniform and stable binder system; then add 30 grams of nano-conductive carbon composite Conductive agent (hollow carbon spheres 2g, carbon black 9g, SP19g), and then ultrasonically dispersed for 2 hours, and finally 100g of NMP was added to adjust the viscosity, and finally oily primer A with a viscosity of 1000 mPa·s was obtained.

[0021] 2. Weigh 100 g of δ-valerolactone and add it into 100 g of polyvinylidene fluoride, and disperse ultrasonically for 2 hours to obtain a uniform and stable film-forming agent dispersion B.

[0022] 3. Apply oily primer A (thickness: 2µm) on the surface of the aluminum foil current collector through gravure printing technology, and dry it; then apply lithium iron phosphate positive electrode slurry (thickness: 200µm) to obtain the positive pole roll B and dry it; then, under the environment wi...

Embodiment 3

[0024] 1. Weigh 1000 grams of N-methylpyrrolidone NMP as an oily solvent, 60 grams of polyvinylidene fluoride PVDF as a binder, stir evenly to obtain a uniform and stable binder system; then add 60 grams of nano-conductive carbon composite Conductive agent (hollow carbon spheres 2g, carbon black 29g, SP29g), and then ultrasonically dispersed for 2 hours, and finally 100g of NMP was added to adjust the viscosity, and finally an oily nano conductive primer A with a viscosity of 3000mPas was obtained.

[0025] 2. Weigh 100 g of δ-valerolactone and add it into 200 g of polyvinylidene fluoride, ultrasonically disperse for 2 hours to obtain a uniform and stable film-forming agent dispersion B.

[0026] 3) Using gravure printing technology, coat the surface of the aluminum foil current collector with oily nano-conductive primer solution A (thickness 1 µm), and dry it; then use a coating machine to coat the surface of the pole roll A with lithium iron phosphate positive electrode slurr...

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Abstract

The invention discloses a preparation method for a rate type lithium ion battery. The method includes the steps of: 1) preparation of an oily nano-conductive primer liquid, 2) preparation of a film forming agent dispersion liquid, and 3) making of a layered pole piece. The lithium ion battery prepared by the method provided by the invention has the characteristics of good rate performance, excellent cycling performance and high safety performance, etc., and is especially suitable for use in lithium ion batteries in the digital communication field.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery production, and specifically improves the rate performance of the lithium-ion battery by surface treatment of pole pieces. Background technique [0002] Lithium-ion battery is a new type of energy storage battery developed in recent years, and has attracted more and more people's attention due to its advantages such as high energy density, long cycle life, and environmental friendliness. There are many factors that affect the popularization and application of lithium-ion batteries, such as cruising range, cost, charging, safety performance and climbing performance. The rate performance of the battery is the key factor affecting the battery climbing performance, and there are many ways to improve the battery rate performance, such as selecting rate-capable positive and negative electrode materials, electrolytes and optimizing battery design, although these methods are in improving the battery. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/66H01M4/62
CPCH01M4/139H01M4/62H01M4/667Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC