Grid-structured carbon-coated lithium iron phosphate nanoparticles and preparation method and application thereof

A technology for carbon-coated lithium iron phosphate and nanoparticles, which is applied in the fields of nanomaterials and electrochemistry, can solve the problems of low conductivity of lithium ion batteries, slow diffusion rate of lithium ions, etc., achieves convenient and repeatable preparation methods, and promotes electron conduction. rate, the effect of reducing the polarization effect

Active Publication Date: 2022-08-09
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-ion batteries using lithium iron phosphate (LFPO) as a cathode are limited by their low electrical conductivity and slow diffusion of lithium ions.

Method used

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  • Grid-structured carbon-coated lithium iron phosphate nanoparticles and preparation method and application thereof
  • Grid-structured carbon-coated lithium iron phosphate nanoparticles and preparation method and application thereof
  • Grid-structured carbon-coated lithium iron phosphate nanoparticles and preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0025] Embodiment 1 of the present invention provides a method for preparing grid-structured carbon-coated lithium iron phosphate nanoparticles, comprising the following steps:

[0026] Step S1, weigh 5g of solid lithium iron phosphate and put it into a beaker containing 100 mL of distilled water, and stir at 80° C. for 30 min until all the solids are dissolved to obtain a lithium iron phosphate solution;

[0027] Step S2, add 0.25g cetyltrimethylammonium bromide to the lithium iron phosphate solution, then immerse the beaker in cold water and cool to room temperature, then heat it in a water bath at 80°C for 10h, collect the precipitate, and wash with distilled water and ethanol Precipitate multiple times to obtain solid precipitate;

[0028] In step S3, the solid precipitate was dried at 120° C. for 20 h, and then dried at 100 mL / min N 2 In a flow rate atmosphere, the temperature of the calcining furnace was first increased from room temperature to 100 °C within 30 minutes,...

Embodiment 2

[0036] The difference between Example 2 and Example 1 is only that the addition amount of cetyltrimethylammonium bromide is 0.75 g; the rest are basically the same as Example 1.

[0037] The carbon-coated lithium iron phosphate nanoparticles prepared in Example 2 were subjected to X-ray testing, scanning electron microscope testing, transmission electron microscopy, and electrochemical performance tests for coin cells. The X-ray testing showed that the prepared product carbon-coated lithium iron phosphate nanoparticles The particle morphology and size are uniform; the positive electrode material of carbon-coated lithium iron phosphate nanoparticles obtained in this example is assembled into a half-cell, and the lithium sheet is used as the negative electrode, and a button battery is used for testing. The constant current charge-discharge test shows that the electrode assembled by the carbon-coated lithium iron phosphate nanoparticle cathode material is at a current density of 2...

Embodiment 3

[0039] The only difference between Example 3 and Example 1 is that the calcination temperature is 800° C.; the rest are basically the same as Example 1.

[0040]The carbon-coated lithium iron phosphate nanoparticles prepared in Example 3 were subjected to X-ray testing, scanning electron microscope testing, transmission electron microscopy, and electrochemical performance tests for coin cells. The X-ray testing showed that the prepared product carbon-coated lithium iron phosphate nanoparticles The particle morphology and size are uniform; the positive electrode material of carbon-coated lithium iron phosphate nanoparticles obtained in this example is assembled into a half-cell, and the lithium sheet is used as the negative electrode, and a button battery is used for testing. The constant current charge-discharge test shows that the carbon-coated lithium iron phosphate nanoparticle cathode has a specific capacity of 154mAh g for the first discharge at a current density of 2C. -...

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Abstract

The invention discloses a preparation method for carbon-coated lithium iron phosphate nanoparticles with grid structure. The steps are as follows: adding water to a lithium iron phosphate solid to dissolve to obtain a lithium iron phosphate solution; adding hexadecyl to the lithium iron phosphate solution Trimethylammonium bromide, heating in a water bath, collecting the precipitate, washing, to obtain a solid precipitate; drying the obtained solid precipitate, and then calcining to obtain carbon-coated lithium iron phosphate nanoparticles with a grid structure. The preparation method provided by the invention is simple, and the carbon-coated lithium iron phosphate particles prepared by the preparation method have good cycle stability, high battery specific capacity and good electrode conductivity, and can be used as a positive electrode material for lithium ion batteries.

Description

technical field [0001] The invention relates to the technical fields of nanomaterials and electrochemistry, in particular to a grid-structured carbon-coated lithium iron phosphate nanoparticle and a preparation method and application thereof. Background technique [0002] With the emphasis on sustainable energy development, people's attention has gradually shifted from traditional fossil energy to new clean energy, and lithium-ion batteries are one of them. Lithium-ion batteries (LIBs) have dominated the portable electronics market for the past 20 years due to their higher energy per unit weight or volume compared to other rechargeable battery systems. At present, lithium-ion batteries are widely pursued in transportation fields such as hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and electric vehicles (EV). Storage and utilization aspects are also seriously considered. Since the seminal report of Padhi et al. in 1997, lithium iron phosphate has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45C01B32/00B82Y40/00B82Y30/00H01M4/36H01M4/58H01M4/62H01M10/0525
CPCC01B25/45C01B32/00B82Y40/00B82Y30/00H01M4/366H01M4/5825H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028C01P2004/80C01P2006/40Y02E60/10
Inventor 董轶凡袁勋龙简烁锋
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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