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Preparation method for carbon compounded lithium ferromanganese phosphate used for lithium ion battery

A carbon composite lithium iron manganese phosphate, lithium ion battery technology, applied in battery electrodes, circuits, electrical components and other directions, can solve problems such as difficult control, complex process, difficult mass production, etc., to achieve convenient operation, simple process, uniformity Sex-enhancing effect

Inactive Publication Date: 2013-03-27
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] These methods have their own advantages, but they generally have complex processes, difficult operations, high costs, and are not environmentally friendly. Due to the harsh conditions of the preparation process and difficult control, it is difficult to form a large-scale commercial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 0.06mol of MnSO 4 ·H 2O with 0.06 mol of NH 4 h 2 PO 4 Dissolve in 500mL of deionized water, drop 200mL of absolute ethanol into the aqueous solution at a rate of 2mL / s at room temperature of 25°C, after dropping about 100mL, a precipitate begins to appear in the aqueous solution, after stirring the aqueous solution for 1.5 hours, The aqueous solution was filtered with a Buchner funnel, washed twice with deionized water, and dried in a blast oven at 80°C for 3 hours to obtain Mn(PO 3 (OH))·3H 2 O as a precursor;

[0028] (2) Mn(PO 3 (OH))·3H 2 O and LiC 2 h 3 o 2 2H 2 O, FeCl 2 4H 2 O is placed in a ball mill jar at a molar ratio of 1:2:1, and then the precursor, lithium acetate, and ferrous chloride with a total mass of 3% sucrose are added, liquid-phase ball milled for 3 hours, and then placed in a blast drying oven at 80°C. Dry for 4 hours, take it out to form a mixture, and then calcinate the mixture in a box furnace at 650°C for 12 hours under the...

Embodiment 2

[0030] (1) 0.25mol of MnC 4 h 6 o 4 4H 2 O with 0.25mol of (NH 4 ) 2 HPO 4 Dissolve in 2L deionized water. At room temperature of 25°C, drop 500mL of absolute ethanol into the aqueous solution at a rate of 1mL / s. After about 260mL was dropped, precipitates began to appear in the aqueous solution. After stirring the aqueous solution for 4.5 hours, the aqueous solution was used to Filtered, washed 3 times with deionized water, and dried in an air drying oven at 80°C for 6 hours to obtain Mn(PO 3 (OH))·3H 2 O as a precursor;

[0031] (2) Mn(PO 3 (OH))·3H 2 O and Li 2 CO 3 , FeSO 4 ·7H 2 O was added to the ball mill jar according to the molar ratio of 6:5:4, then the precursor, lithium carbonate, and ferrous sulfate with 5% sucrose were added, liquid-phase ball milled for 4 hours, and then dried in a blast oven at 80°C for 5 After taking it out, a mixture is formed, and then the mixture is calcined in a box furnace at 600°C for 16 hours under the protection of hydro...

Embodiment 3

[0033] (1) 0.6mol of MnCl 2 4H 2 O with 0.6mol of NaH 2 PO 4 Dissolve in 5L deionized water. At room temperature of 25°C, drop 1.5L of absolute ethanol into the aqueous solution at a rate of 5mL / s. After about 800mL was dropped, precipitates began to appear in the aqueous solution. After stirring the aqueous solution for 5 hours, the aqueous solution was washed with Brookner Filtered through a funnel, washed 3 times with deionized water, and dried in a blast oven at 90°C for 8 hours to obtain Mn(PO 3 (OH))·3H 2 O as a precursor;

[0034] (2) Mn(PO 3 (OH))·3H 2 O and LiOH·H 2 O, FeCl 2 4H 2 O was added to the ball mill tank according to the molar ratio of 4:5:1, and then the precursor, lithium hydroxide, and ferrous chloride with 4% glucose in total mass were added, and the liquid phase ball milled for 5 hours, and then dried in a blast drying oven at 80°C. Dry for 6 hours, take it out to form a mixture, and then calcinate the mixture in a box furnace at 700°C for 9 ...

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Abstract

The invention relates to a preparation method for carbon compounded lithium ferromanganese phosphate used for a lithium ion battery. The preparation method comprises the steps of (1) dissolving a manganese source compound and a phosphorus source compound in water to form a water solution; dripping absolute ethyl alcohol in the water solution; stirring, filtering, washing and drying when a precipitate appears in the water solution to obtain a precursor; and (2) ball-milling the precursor, a lithium source compound and a ferrous salt compound, drying to form a mixture, calcining the mixture and cooling the calcined mixture to obtain the carbon compounded lithium ferromanganese phosphate material. In the method, a soluble manganese-containing compound is employed as a manganese source; a soluble phosphorus-containing compound is employed as a phosphorus source; the raw materials are mixed uniformly to obtain the uniform precursor on a molecular level; and the precursor, the lithium source and the ferrous source liquid are mixed; so that the uniformity is improved. Besides, by only using absolute ethyl alcohol as an ageing agent, the method is simple in operations and processes, and is suitable for large-scale commercialized production. The absolute ethyl alcohol ageing agent is non-toxic and harmless, can be recycled through rectification in the large-scale production, can be reused circularly, and is low carbon and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a preparation method of carbon-composite lithium manganese iron phosphate for lithium-ion batteries. Background technique [0002] New energy and renewable energy technology is recognized as the most important high-tech industry in the 21st century, and the development direction of electrochemical energy storage system is large capacity, high power and long life. Lithium-ion battery system is a new type of energy storage system that has emerged in recent years. It has the advantages of light weight, large energy storage, high power, good safety performance, long life, and small self-discharge coefficient. It has penetrated into all aspects of people's lives and is widely used. Used in mobile phones, digital cameras, camcorders, notebook computers, toys, electric tools, etc., it is currently the practical secondary battery system with the highest ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587
CPCY02E60/12Y02E60/10
Inventor 彭庆文宗军刘兴江刘浩杰任丽彬
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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