Ligand-coated doped lithium iron phosphate as well as preparation method and application thereof

A lithium iron phosphate, doped technology, applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor modification effect, etc., to achieve improved electrochemical performance, excellent structure, and reduced cracking The effect of probability

Pending Publication Date: 2022-04-19
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, a single modification test is often limited by conditions, and the modification effect is not good, especially for lithium iron phosphate cathode materials

Method used

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  • Ligand-coated doped lithium iron phosphate as well as preparation method and application thereof
  • Ligand-coated doped lithium iron phosphate as well as preparation method and application thereof
  • Ligand-coated doped lithium iron phosphate as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] The ligand-coated doped lithium iron phosphate of this embodiment has a chemical formula of LiFePO 4 @Mn-Zn / Ga-C / N.

[0056] The preparation method of the ligand-coated doped lithium iron phosphate of this embodiment, the specific steps are as follows:

[0057] (1) Add 100mL of 0.74mol / L ammonium dihydrogen phosphate and 70mL of 0.50mol / L ferric sulfate dropwise into a reactor with a capacity of 500mL and stir, during which time 20mL containing 0.20g of octadecyltrimethylammonium chloride is added dropwise solution, and add an appropriate amount of phosphoric acid to control the pH of the solution to 2.3, send the reaction kettle to the heating box, heat at 585°C for 6 hours under Argon, let stand overnight, filter, wash, and dry to obtain 11.7g of spherical ferric phosphate;

[0058] (2) Mix 2.5g nano-carbon spheres, 0.05g manganese sulfate, 0.05g zinc chloride, 0.05g gallium sulfate, 1.2g methacryloyl, 5mL deionized water, stir, centrifuge, filter, and send to the dr...

Embodiment 2

[0063] The ligand-coated doped lithium iron phosphate of this embodiment has a chemical formula of LiFePO 4 @Mn-Zn / Co-C / N.

[0064] The preparation method of the ligand-coated doped lithium iron phosphate of this embodiment, the specific steps are as follows:

[0065] (1) Add 110mL of 0.74mol / L ammonium dihydrogen phosphate and 73mL of 0.50mol / L ferric sulfate dropwise into a 500mL high-temperature-resistant reactor and stir, during which time 20mL containing 0.20g of octadecyl trimethyl chloride is added dropwise. Ammonium chloride solution, add an appropriate amount of phosphoric acid to control the pH of the solution = 2.3, send the reaction kettle to the heating box, heat at 585°C for 6 hours under Argon, let it stand overnight, filter, wash, and dry to obtain 11.7g of spherical ferric phosphate;

[0066] (2) Mix 2.5g nano-carbon spheres, 0.05g manganese sulfate, 0.05g zinc chloride, 0.05g cobalt sulfate, 1.0g methacryloyl, 5mL deionized water, stir, centrifuge, filter, a...

Embodiment 3

[0071] The ligand-coated doped lithium iron phosphate of this embodiment has a chemical formula of LiFePO 4 @Mn-Co / Cu-C / N.

[0072] The preparation method of the ligand-coated doped lithium iron phosphate of this embodiment, the specific steps are as follows:

[0073] (1) Add 115mL of 0.74mol / L ammonium dihydrogen phosphate and 75mL of 0.50mol / L ferric sulfate dropwise into a 500mL high-temperature-resistant reactor and stir, during which time 25mL containing 0.20g of octadecyl trimethyl chloride is added dropwise. Ammonium chloride solution, add an appropriate amount of phosphoric acid to control the pH of the solution = 2.4, send the reaction kettle to the heating box, heat at 585 ° C for 6 hours under Argon, let it stand overnight, filter, wash, and dry to obtain 11.9 g of spherical ferric phosphate;

[0074] (2) Mix 2.5g nano-carbon spheres, 0.06g manganese sulfate, 0.06g zinc chloride, 0.04g gallium sulfate, 1.5g methacryloyl, 9mL deionized water, stir, centrifuge, filte...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses ligand-coated doped lithium iron phosphate as well as a preparation method and application thereof, and the general formula of the ligand-coated doped lithium iron phosphate is LiFePO4 (at) Mn-T-C / N, and T is at least one of zinc, nickel, copper, iron, cobalt, zirconium, aluminum, gallium and chromium. According to the ligand-coated doped lithium iron phosphate, doping is performed by the composite load type micro-carbon sphere conductor, the particle size of the composite load type micro-carbon sphere conductor reaches 80-150nm level, so that the ligand-coated doped lithium iron phosphate can bear stress with higher strength and reduce the probability of fracture, and the spherical lithium iron phosphate doped by the composite load type micro-carbon sphere conductor has the advantages that the service life of the ligand-coated doped lithium iron phosphate is prolonged, and the service life of the ligand-coated doped lithium iron phosphate is prolonged. And the material structure integrity is easier to control.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to ligand-coated doped lithium iron phosphate and a preparation method and application thereof. Background technique [0002] At present, relatively mature cathode materials for lithium batteries mainly contain transition metal oxides (lithium cobalt) oxides, lithium manganate, olivine-type structures, etc.), fluorine and chlorine compounds. Lithium cobalt oxide cathode material is the most successful business model, initially commercialized by Sony Corporation. However, its main limitation is that the cost is too high, and the thermal stability is low, which is easy to cause spontaneous combustion, such as the spontaneous combustion and explosion of a certain brand of mobile phones and electric vehicles. Lithium manganate has relatively low toxicity and low price, but its cycle performance is particularly low, which also limits the further commercializati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M4/38H01M10/0525H01M2004/028Y02E60/10C01B25/45
Inventor 钟应声余海军谢英豪李爱霞李波李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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