Waterborne binder positive electrode material for lithium iron phosphate battery and preparation method therefor

A technology of lithium iron phosphate battery and water-based binder, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high toxicity at the production site, affecting the migration rate of electrons and protons, and high recycling costs, and achieves green and non-toxic Pollution production process, good chemical stability, safe and convenient use

Active Publication Date: 2016-03-23
HEFEI HENGNENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Although the organic solvent NMP has good dispersibility, it is volatile, flammable, explosive, and highly toxic; the volatilization of organic solvents seriously pollutes the environment, making the production site highly toxic, and seriously affecting the health of the production workshop staff
[0004] (2) The prices of the organic dispersion solvent NMP and the binder PVDF are relatively high, and the pole piece coating process using PVDF as the binder requires strict sealing, resulting in high energy consumption, high recycling costs, and high production costs
[0005] (3) Since PVDF contains fluorine, it is easy to promote the internal pressure of lithium-intercalated graphite batteries; the large molecular weight of PVDF in the pole piece directly affects the dispersion and the migration rate of electrons and protons. In all electrolyte systems There is a certain swelling in the battery, and the insulation to ions and electrons will directly affect the defect of increasing the internal resistance of the battery

Method used

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  • Waterborne binder positive electrode material for lithium iron phosphate battery and preparation method therefor
  • Waterborne binder positive electrode material for lithium iron phosphate battery and preparation method therefor
  • Waterborne binder positive electrode material for lithium iron phosphate battery and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) First dry the lithium iron phosphate, conductive agent, binder and additive respectively, and then weigh: lithium iron phosphate: 93 parts, conductive agent: 3 parts, binder: 4 parts, additive: 6 parts, Deionized water: 74.4 parts;

[0032] (2) The binding agent (carboxymethyl chitosan and polyethylene glycol is 2.8:1 by weight), additive trihydroxypropane-triacrylate, and 80% of deionized water are added together to the double planetary mixer Stir in the inner barrel of the double-layer mixing barrel for 2 hours, and at the same time add 50°C hot water to the outer compartment of the double-layer mixing barrel for circulation, so that the binder and additives can be quickly dispersed and dissolved; the dispersion of the double planetary mixer The speed is 600±20 m / s, the revolution is 20±1 m / s;

[0033] (3) Add conductive agent acetylene black and carbon black (SP) to the mixed material in (2), and stir for 1 to 2 hours with a double planetary mixer at a dispersio...

Embodiment 2

[0039] (1) First dry the lithium iron phosphate, conductive agent, binder and additive respectively, and then weigh: lithium iron phosphate: 94 parts, conductive agent: 4 parts, binder: 3 parts, additive: 3 parts, Deionized water: 79.9 parts;

[0040] (2) The binding agent (carboxymethyl chitosan and polyethylene glycol is 3.3:1 by weight), additive trihydroxypropane-triacrylate, and 80% of deionized water are added together to the double planetary mixer Stir in the inner barrel of the double-layer mixing barrel for 3 hours, and at the same time add hot water at 55°C to the outer compartment of the double-layer mixing barrel for circulation, so that the binder and additives can be quickly dispersed and dissolved; the dispersion of the double planetary mixer The speed is 600±20 m / s, the revolution is 20±1 m / s;

[0041] (3) Add conductive agent Ketjen black and carbon nanotubes to the mixed material in (2), and the double planetary mixer is 1500 ± 20 m / s with a dispersion speed...

Embodiment 3

[0054] Embodiment 3: Performance test of lithium iron phosphate battery

[0055] The positive electrode materials prepared in Example 1 and Comparative Example 1 were respectively made into 5 groups of lithium iron phosphate batteries, wherein the positive electrode materials in Example 1 were used to make W1, W2, W3, W4, W5 this group of lithium iron phosphate batteries. The positive electrode materials in Comparative Example 1 were made into five groups of lithium iron phosphate batteries D1, D2, D3, D4, and D5, and their basic properties are shown in Table 3 below:

[0056] Table 3: Basic performance indicators of the battery:

[0057]

[0058] As can be seen from the above table 3, the average value of the 1C discharge platform voltage of the lithium iron phosphate battery made of the positive electrode material of the present invention is 0.0346V higher than that of the lithium iron phosphate battery made of the oil-based material, and the average value of the internal...

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Abstract

The invention provides a waterborne binder positive electrode material for a lithium iron phosphate battery and a preparation method therefor. The waterborne binder positive electrode material is prepared from 93-94 parts of lithium iron phosphate, 3-4 parts of conductive agent, 3-4 parts binder, additive accounting for 1-1.5% of the weight of the binder and deionized water accounting for 80-85% of the weight of the lithium iron phosphate by steps of mixing and stirring; and the binder comprises carboxymethyl chitosan and polyethylene glycol in the weight ratio of (2.8-3.3). The carboxymethyl chitosan and polyethylene glycol are compounded to be used as the binder, so that tight electronic contact and stable pole sheet structure are formed among the components; a certain buffer effect takes effect on the volume expansion and shrinkage in the charging/discharging process of the battery; meanwhile, solvent release does not exist, so that the waterborne binder positive electrode material and the preparation method are environment-friendly; and the waterborne binder positive electrode material is low in cost, non-combustible, and safe and convenient to use.

Description

technical field [0001] The invention relates to a lithium iron phosphate battery, in particular to a water-based binder positive electrode material of the lithium iron phosphate battery and a preparation method thereof. Background technique [0002] Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as the positive electrode material. In the large-scale production of the lithium iron phosphate battery industry, an organic solvent-based binder system is generally used, and polyvinylidene fluoride (PVDF) with a crystallinity of 50% is used as the binder, and the highly polar compound NMP ( N-methylpyrrolidone) as a dispersing solvent. It has the following disadvantages: [0003] (1) Although the organic solvent NMP has good dispersibility, it is volatile, flammable, explosive, and highly toxic; the volatilization of the organic solvent seriously pollutes the environment, makes the production site highly toxic, and seriously affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/36H01M10/0525
CPCH01M4/362H01M4/5825H01M4/62H01M4/621H01M10/0525Y02E60/10
Inventor 陈大圣陈军武玉哲
Owner HEFEI HENGNENG NEW ENERGY TECH
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