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Preparation method of lithium iron phosphate battery positive plate using water-based adhesive and carbon-coated conductive aluminum foil current collector

A lithium iron phosphate battery and water-based binder technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problem of high cost of lithium iron phosphate power batteries, improve service life, improve energy density, reduce The effect of internal resistance

Active Publication Date: 2015-03-11
ZHEJIANG CASNOVO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large-scale commercial application of lithium iron phosphate power batteries is still limited by the high cost, and its cycle life needs to be improved.

Method used

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  • Preparation method of lithium iron phosphate battery positive plate using water-based adhesive and carbon-coated conductive aluminum foil current collector
  • Preparation method of lithium iron phosphate battery positive plate using water-based adhesive and carbon-coated conductive aluminum foil current collector
  • Preparation method of lithium iron phosphate battery positive plate using water-based adhesive and carbon-coated conductive aluminum foil current collector

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the preparation method comprises the following steps;

[0032] (1) Preparation of modified water-based binder; by mass parts, 35 parts of chitosan, 25 parts of polyethylene oxide, 20 parts of water-based binder, 11 parts of sodium carboxymethylcellulose and 10 parts of polyamino Formate (also known as PU glue) is fully mixed to prepare a water-based binder, in which polyethylene oxide, sodium carboxymethylcellulose and polyurethane can be obtained commercially. Preferably, the water-based binder can be the binder for lithium ion battery electrode materials disclosed in Publication No. 102760883A. Specifically, the water-based binder is chitosan and its derivatives shown in formula I, and the dispersion system is deionized water or 1% acetic acid-water mixed system;

[0033]

[0034] Wherein, X in derivative type I is selected from various hydrocarbon acyl groups, aromatic acyl groups, alkyl groups and aromatic groups; Y in derivative type II is selecte...

Embodiment 2

[0040] Embodiment 2: the preparation method comprises the following steps;

[0041] (1) Preparation of modified water-based binder; by mass parts, 40 parts of chitosan, 20 parts of polyethylene oxide, 20 parts of water-based binder, 10 parts of sodium carboxymethylcellulose and 10 parts of polyamino A water-based binder is obtained after the formate esters are thoroughly mixed.

[0042](2) Mix 4 parts of modified water-based binders with 80 parts of deionized water, and stir for 25 minutes under a vacuum condition of 1500 revolutions per minute and 15 revolutions per minute, and -0.9mpa; obtain product A;

[0043] (3) Add 3% conductive agent of A product quality to A product, stir until the conductive agent is fully wetted, and then stir for 200min under vacuum conditions of rotation 2700rpm / min and revolution 70rpm / min, and -0.9mpa; B product;

[0044] (4) Add 93 parts of lithium iron phosphate dry powder and 20 parts of deionized water to 1 part of product B, mix, and then...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate battery positive plate using water-based adhesive and a carbon-coated conductive aluminum foil current collector. The preparation method comprises the following steps: improving preparation of modified water-based adhesive, mixing the modified water-based adhesive with deionized water, stirring, adding a conductive agent, stirring, adding dry lithium iron phosphate powder and deionized water to obtain paste, and coating the surface of the carbon-coated conductive aluminum foil current collector with the paste to obtain a finished product. The lithium iron phosphate battery positive plate is not only non-toxic, harmless, safe and environment-friendly, but also relatively low in price; furthermore, the lithium iron phosphate battery positive plate reduces internal resistance of a battery and enhances the energy density and the rate discharge performance of the battery.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode sheet of a lithium ion battery, especially a method for preparing a positive electrode sheet of a lithium iron phosphate battery, in particular a method for preparing a positive electrode sheet of a lithium iron phosphate battery using a water-based binder and a carbon-coated conductive aluminum foil current collector . Background technique [0002] With the improvement of people's living standards, the continuous improvement of the urban environment, and the shortage of domestic resources, new energy pure electric vehicles and gasoline-electric hybrid vehicles have become the first choice for public transportation. [0003] At present, most of the preparation methods of positive pole pieces of lithium-ion batteries use PVDF (polyvinylidene fluoride) binder, NMP (N-methylpyridone) as solvent, and add other conductive agents and active substances to dissolve PVDF; after sol The activ...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/62H01M4/66
CPCH01M4/1397H01M4/622H01M4/663Y02E60/10
Inventor 邵汉琦张灵志焦书仁何伟东刘俊杰
Owner ZHEJIANG CASNOVO MATERIALS
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