Lithium ferrous phosphate/iron phosphide/carbon composite nanofiber and its preparation method and application

A lithium iron phosphate and nanofiber technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as hindering the application of LiFePO4 materials, complex sol-gel process, and unsatisfactory charge and discharge performance. Effects of good fiber morphology and electrical conductivity, improved spinnability, and excellent uniformity

Inactive Publication Date: 2016-06-08
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the particle size of LiFePO4 synthesized by the high-temperature solid-state method is large, and the charge and discharge performance is not ideal; the process of the sol-gel method is relatively complicated and the production cost is high; although the hydrothermal method can Control particle size, but industrial production is more difficult
On the other hand, LiFePO 4 The material itself also has some obvious defects, such as LiFePO 4 The conductivity is very low, Li ions in LiFePO 4 Difficulty in diffusion, etc., these defects also hinder the LiFePO 4 material application

Method used

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  • Lithium ferrous phosphate/iron phosphide/carbon composite nanofiber and its preparation method and application
  • Lithium ferrous phosphate/iron phosphide/carbon composite nanofiber and its preparation method and application
  • Lithium ferrous phosphate/iron phosphide/carbon composite nanofiber and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Dissolve 0.55g of lithium dihydrogen phosphate, 1.76g of iron acetylacetonate, 0.15g of urea and 0.72g of polyvinylpyrrolidone (Mw=1,300,000) in a mixed solvent of 8mL of distilled water and 2mL of ethanol, and stir in a water bath at 60°C for 20 hour, and then added 0.03 g of carbon nanotubes to obtain a spinning solution. When performing electrospinning, the spinning conditions are: the electrospinning voltage is 20kV, the temperature is 30°C, graphite paper is used for collection, the inner diameter of the needle is 0.45mm, and the distance between the needle and the collection device is 15cm. The fibers collected by electrospinning were placed in a tube furnace, heated to 450 ° C for 2 hours to make the reaction occur slowly, and prevent the reaction from occurring too quickly. 4 Influenced by the crystal lattice, the temperature was then raised to 700°C for 5 hours, and finally cooled to room temperature naturally. During the entire heat treatment process, the prote...

Embodiment 2

[0035] Dissolve 0.42g lithium hydroxide, 1.05mL concentrated phosphoric acid, 4.66g ferric oxalate, 0.08g glucose and 0.85g polyethylene oxide (Mv=600,000) in a mixed solvent consisting of 6mL distilled water, 3mL ethanol and 1mL acetone, The mixture was stirred for 20 hours under a water bath condition of 50° C. to obtain a spinning solution. When performing electrospinning, the spinning conditions are: the electrospinning voltage is 20kV, the temperature is 40°C, graphite paper is used for collection, the inner diameter of the needle is 0.45mm, and the distance between the needle and the collection device is 30cm. The fiber precursor collected by electrospinning was placed in a tube furnace, heated to 450°C and calcined for 1.5 hours to make the reaction occur slowly and prevent the reaction from occurring too quickly. 4 Influenced by the crystal lattice, the temperature was then raised to 800°C for 4 hours, and finally cooled to room temperature naturally. During the entire...

Embodiment 3

[0037] Dissolve 1.3g of lithium dihydrogen phosphate, 3.0g of ferric citrate, 0.15g of sucrose, 0.75g of polyvinylpyrrolidone (Mw=1,300,000) and 0.50g of polyethylene oxide (Mv=600,000) in 10mL of distilled water at 70 After stirring for 10 hours under the condition of a water bath at °C, 0.02 g of carbon nanotubes was added to obtain a spinning solution. When performing electrospinning, the spinning conditions are: the electrospinning voltage is 30kV, the temperature is 70°C, graphite paper is used for collection, the inner diameter of the needle is 0.45mm, and the distance between the needle and the collection device is 25cm. The fibers collected by electrospinning were placed in a tube furnace, heated to 450 ° C for 2 hours to make the reaction occur slowly, and prevent the reaction from occurring too quickly. 4 Influenced by the crystal lattice, then the temperature was raised to 850°C for 5 hours, and finally cooled to room temperature naturally. During the whole heat tre...

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Abstract

The invention provides a lithium iron phosphate / iron phosphide / carbon composite nanofiber including the following components by mass percent: 50-99% of lithium iron phosphate, 0.5-30% of iron phosphide and 1-20% carbon. The average diameter of the lithium iron phosphate / iron phosphide / carbon composite nanofiber is 50-500nm and spherical particles of iron phosphide exist in the composite nanofiber. The lithium iron phosphate / iron phosphide / carbon composite nanofiber has good fiber morphology and conductivity and is high in discharge capacity when being used as a positive material of a lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a lithium iron phosphate / iron phosphide / carbon composite nanofiber and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have many advantages such as high working voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. They are a new generation of green high-energy batteries. At present, lithium-ion batteries have been widely used in notebook computers, various portable electric tools, weapons and other fields, and also show very attractive application prospects in electric motorcycles and electric vehicles. [0003] The positive electrode material is an important part of the lithium ion battery, and the commonly used lithium ion battery positive electrode material is lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium iron phosphate (LiFePO 4 ), lithium mangane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 邱业君耿艳辉
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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