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Method for preparing lithium iron phosphate/carbon composite material by using aniline

A technology of carbon composite materials and lithium iron phosphate, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of shortening Li+ diffusion path and inability to effectively improve the electronic conductivity of materials, and achieve the effect of improving electrochemical performance

Active Publication Date: 2013-07-17
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the fine particles are mostly realized by means of liquid phase methods such as co-precipitation method and hydrothermal method, but purely by synthesizing nanoscale LiFePO with smaller particle size 4 material, although it can shorten the diffusion path of Li+, so that Li + In LiFePO 4 It is more convenient to intercalate / deintercalate on the surface, but it cannot effectively improve the LiFePO 4 electronic conductivity of the material

Method used

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  • Method for preparing lithium iron phosphate/carbon composite material by using aniline
  • Method for preparing lithium iron phosphate/carbon composite material by using aniline
  • Method for preparing lithium iron phosphate/carbon composite material by using aniline

Examples

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Effect test

Embodiment 1

[0019] Weigh 2.62 grams of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 3.73 grams of ferric chloride (FeCl 3 ) and were dissolved in 250mL and 125mL of deionized water respectively, and 1.0 milliliter (mL) of aniline was added dropwise to NH 4 h 2 PO 4 solution and stirred to make it evenly dispersed; then, the FeCl3 solution was slowly added dropwise to the NH4H2PO4 solution containing aniline. Stir the above mixed solution at room temperature for 5 hours to generate the iron phosphate / polyaniline precursor, wash the iron phosphate / polyaniline several times with deionized water and centrifuge each time, put the obtained iron phosphate / polyaniline precipitate into In a blast oven, dry at 80° C. (Celsius) for 4 hours. The dried material was ground into powder, placed in a tube furnace at a heating rate of 5°C / min (Celsius / minute), under a protective atmosphere, annealed at 400°C for 6 hours, and then cooled naturally to obtain crystallized water and polymer Anilin...

Embodiment 2

[0025] Weigh 5.52 grams of phosphoric acid (H3PO4) and 5.31 grams of ferric nitrate (Fe(NO3)3) with a concentration of 38% and dissolve them in 400 mL and 200 mL of deionized water respectively, add 0.5 mL of aniline dropwise to the H3PO4 solution and stir to make The uniform dispersion; then, the Fe (NO3) 3 solution is slowly added dropwise to the H3PO4 solution containing aniline. Stir the above mixed solution at room temperature for 3 hours to generate the iron phosphate / polyaniline precursor, wash the iron phosphate / polyaniline several times with deionized water and centrifuge each time, put the obtained iron phosphate / polyaniline precipitate into Dry in a blast oven at 80°C for 5 hours. Grind the dried material into powder, place it in a tube furnace at a heating rate of 10°C / min, and under the protection of nitrogen atmosphere, anneal at 300°C for 5 hours and then cool naturally to remove crystal water and pyrolyze polyaniline Carbonized FePO4 / C.

[0026] Dissolve 1.51...

Embodiment 3

[0029] Weigh 2.17 grams of diammonium hydrogen phosphate ((NH4)2HPO4) and 4.38 grams of ferric citrate and dissolve them in 200 mL and 100 mL of deionized water respectively, add 1.5 mL of aniline dropwise into the H3PO4 solution and stir to make it evenly dispersed; then , The ferric citrate solution was slowly added dropwise to the (NH4)2HPO4 solution containing aniline. Stir the above mixed solution at room temperature for 4 hours to generate the iron phosphate / polyaniline precursor, wash the iron phosphate / polyaniline precursor several times with deionized water and centrifuge each time, and precipitate the obtained iron phosphate / polyaniline Put it into a blast oven and dry at 80°C for 3 hours. The dried material is ground into powder, placed in a tube furnace at a heating rate of 15°C / min, under the protection of nitrogen atmosphere, annealed at 500°C for 4 hours and then cooled naturally to obtain crystal water and polyaniline is pyrolyzed Carbonized FePO4 / C.

[0030]...

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Abstract

The invention discloses a method for preparing a lithium iron phosphate / carbon composite material by using aniline. The method comprises the steps that: trivalent iron salt and a phosphorus-containing compound are respectively dissolved in a certain amount of deionized water, such that solutions are prepared; a proper amount of aniline is dropped into the phosphorus-containing compound solution, and the mixture is stirred, such that the mixture is uniformly dispersed; the trivalent iron salt solution is slowly dropped into the water-soluble phosphorus-containing compound solution comprising aniline; the mixture is stirred for 3-5h under room temperature, such that a FePO4 / PANI precursor is synthesized. During the process, when Fe<3+> enters the water solution comprising PO4<3-> and aniline, FePO4 precipitate is first precipitated; simultaneously, Fe<3+> serves as a catalyst for promoting an oxidative polymerization reaction of aniline on the surface of FePO4 particles, such that polyaniline is produced and coated on the surface of FePO4. Therefore, FePO4 particle growth is effectively limited, and the FePO4 / PANI precursor with relatively small particle size is obtained. Lithium intercalation is carried out upon the FePO4 / PANI precursor, such that lithium iron phosphate / carbon is obtained. With the method, prepared lithium iron phosphate / carbon has the advantages of small particles and excellent electrochemical properties.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium iron phosphate / carbon (LiFePO4 / C) composite material used for a positive electrode of a lithium ion battery. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) and lithium cobalt oxide (LiCoO 2 ) and other cathode materials, it has the outstanding advantages of long service life, abundant raw materials, low cost, high specific capacity, high thermal stability, excellent cycle stability, and environmental friendliness. Since 1997, Padhi et al. first used LiFePO4 with orthorhombic olivine structure as a cathode material for lithium-ion batteries. The research on this material has gradually become a research hotspot for scientific researchers in various countries. It is a lithium-ion battery with great application potential. Cathode material. But LiFePO 4 The low electronic conductivity of the material (10...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 赵兵
Owner OPTIMUM BATTERY CO LTD
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