Preparation method for lithium iron phosphate positive electrode of lithium ion battery

A lithium-ion battery and lithium iron phosphate technology, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of the positive electrode being difficult to completely dry and the solid components being difficult to disperse, and achieve good consistency

Active Publication Date: 2015-06-24
宁波维科新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the solid components are not easy to disperse and the positive electrode is not easy to completely dry during the preparation process of the positive electrode of the lithium iron phosphate lithium ion battery in the prior art, and provides a method for preparing the positive electrode of the lithium iron phosphate lithium ion battery. The preparation method has simple process steps, the solid components are uniformly dispersed during the preparation process, the pole piece is thoroughly dried, and the battery made of the positive electrode obtained by the present invention has good electrochemical performance

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  • Preparation method for lithium iron phosphate positive electrode of lithium ion battery

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Embodiment 1

[0027] (1) Weighing: Based on the total mass of the positive electrode slurry, weigh each component according to the following mass percentages: 45% lithium iron phosphate, 2% conductive agent, 2% water-based binder, 3% ethanol, 48% ionized water, the conductive agent is conductive carbon black, and the water-based binder is made by mixing sodium alginate and acrylonitrile multi-polymer copolymer LA133 at a mass ratio of 3:5.

[0028] (2) Preparation of premix: After mixing ethanol and conductive agent evenly, add water-based binder and part of deionized water, and ball mill until the material fineness is 5 μm to obtain a premix, in which the mass of part of deionized water is 40% of the total mass of deionized water.

[0029] (3) Primary dispersion: add lithium iron phosphate to the premix and then ball mill until the material fineness is 5 μm.

[0030] (4) Secondary dispersion: add the materials in step (3) to the planetary slurry mixer, add the remaining amount of deionize...

Embodiment 2

[0037] (1) Weighing: Based on the total mass of the positive electrode slurry, weigh each component according to the following mass percentages: 47% lithium iron phosphate, 2.7% conductive agent, 2.6% water-based binder, 4% ethanol, Ionized water 43.7%, the conductive agent is conductive carbon black and carbon nanotubes (mass ratio 1:2), and the water-based binder is made of sodium alginate and acrylonitrile multi-polymer copolymer LA133 in a mass ratio of 3:6.

[0038] (2) Preparation of premix: After mixing ethanol and conductive agent evenly, add water-based binder and part of deionized water, and ball mill until the fineness of the material is 7 μm to obtain a premix, in which the mass of part of deionized water is 35% of the total mass of deionized water.

[0039] (3) Primary dispersion: Add lithium iron phosphate to the premix and then ball mill until the material fineness is 6 μm.

[0040] (4) Secondary dispersion: Add the materials in step (3) into the planetary slurry...

Embodiment 3

[0046] (1) Weighing: Based on the total mass of the positive electrode slurry, weigh each component according to the following mass percentages: 50% lithium iron phosphate, 3% conductive agent, 3% water-based binder, 5% ethanol, Ionized water 39%, of which the conductive agent is conductive carbon black, carbon nanotubes and flake graphite (mass ratio 1:2:1), and the water-based binder is composed of sodium alginate and acrylonitrile multi-polymer LA133 in a mass ratio of 3:2 Mixed,.

[0047] (2) Preparation of premix: After mixing ethanol and conductive agent evenly, add water-based binder and part of deionized water, and ball mill until the material fineness is 10 μm to obtain premix, in which the mass of part of deionized water is 30% of the total mass of deionized water.

[0048] (3) Primary dispersion: Add lithium iron phosphate to the premix and then ball mill until the material fineness is 10 μm.

[0049] (4) Secondary dispersion: add the materials in step (3) into th...

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Abstract

The invention discloses a preparation method for a lithium iron phosphate positive electrode of a lithium ion battery. The preparation method overcomes the problems of uneasy dispersion of solid components and hard thorough drying of positive electrodes in preparation of lithium iron phosphate positive electrodes of lithium ion batteries in the prior art. The preparation method mainly comprises the following steps: (1) weighing materials; (2) preparation of a premix; (3) primary dispersion; (4) secondary dispersion; (5) slow stirring; (6) coating; and (7) drying in segments. The preparation method provided by the invention has the advantages of simple steps, uniform dispersion of each solid component in the process of preparation and thorough drying of pole pieces; and the battery prepared from the positive electrode has good electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a positive electrode of a lithium iron phosphate lithium ion battery. Background technique [0002] At present, according to the type and processing technology of the solvent in the positive electrode formula slurry of lithium iron phosphate battery, the positive electrode slurry can be divided into oil-based (NMP as solvent) slurry and water-based (deionized water as solvent) slurry. Water-based slurry does not involve Solvent recovery and environmental pollution problems, and the price is cheap, and the homogenate is less restricted by the environment, so it is favored by many lithium battery factories. However, the conductive agent, positive active material and other solid substances in the water-based positive electrode slurry are not easy to disperse evenly. The consistency of the water-based positive electrode slurry is poor, the stabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1397
CPCH01M4/0402H01M4/1397Y02E60/10
Inventor 毛德来马伟华颜雪冬
Owner 宁波维科新能源科技有限公司
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