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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large-scale commercial application of lithium iron phosphate power ba

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0032] (1) Preparation of modified water-based binder; 35 parts of chitosan, 25 parts of polyethylene oxide, 20 parts of water-based binder, 11 parts of sodium carboxymethyl cellulose and 10 parts of polyamino The formate (also called PU glue) is thoroughly mixed to prepare an aqueous binder, in which polyethylene oxide, sodium carboxymethyl cellulose and polyurethane are all commercially available. Preferably, the aqueous binder can be the binder for lithium ion battery electrode materials disclosed in Publication No. 102760883A. Specifically, the aqueous binder is chitosan and its derivatives represented by formula I, and the dispersion system is deionized water or a 1% acetic acid-water mixed system;

[0033]

[0034] Among them, X of the derivative type I is selected from various hydrocarbon acyl groups, aromatic acyl groups, alkyl groups and aromatic groups; and Y of the derivative type II is selected...

Example Embodiment

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

[0041] (1) Preparation of modified water-based binder; according to mass parts, 40 parts of chitosan, 20 parts of polyethylene oxide, 20 parts of water-based binder, 10 parts of sodium carboxymethyl cellulose and 10 parts of polyamino The formate is fully mixed to prepare an aqueous binder.

[0042] (2) Mix 4 parts of modified water-based binder and 80 parts of deionized water, and stir for 25 minutes under vacuum conditions of 1500 revolutions per minute and 15 revolutions per minute, and -0.9mpa; product A is obtained;

[0043] (3) Add 3% of the conductive agent of quality A to product A, stir until the conductive agent is fully wetted, and then stir for 200min under vacuum conditions of 2700rpm / min and 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 B product and mix, and then stir for 200min under the vacuum con...

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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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