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Preparation method of carbon-nanotube-modified lithium iron phosphate lithium ion battery positive electrode material

A lithium iron phosphate, lithium ion battery technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of low electronic conductivity, poor rate charge and discharge performance, etc., and achieve good crystallization and controllable thickness. Effect

Inactive Publication Date: 2014-02-05
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after years of research, there are still some application problems, the most important of which is the poor rate charge and discharge performance, and a key factor affecting the rate performance of lithium iron phosphate is the low electronic conductivity of the material and Li + mobility, only 10 -9 S / cm

Method used

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  • Preparation method of carbon-nanotube-modified lithium iron phosphate lithium ion battery positive electrode material
  • Preparation method of carbon-nanotube-modified lithium iron phosphate lithium ion battery positive electrode material
  • Preparation method of carbon-nanotube-modified lithium iron phosphate lithium ion battery positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0023] Add 0.1 g of lithium chloride, 0.16 g of ferrous chloride tetrahydrate, and 72 μL of phosphoric acid into 8 mL of absolute ethanol, stir for 2 minutes, add 6 mg of carbon nanotubes into the above-mentioned absolute alcohol solution, ultrasonicate and stir for 3 minutes each. Pour the anhydrous alcohol solution containing carbon nanotubes into the crucible, and then place the crucible on the upper part of the sealable container. 3mL ammonia water (0.05mol / L) is placed in the bottom of the sealable container in advance. After sealing the container, put it into an oven, start heating to 200°C, the heating rate is 10-20°C / min, and keep it warm for 10 hours after the temperature reaches the set temperature. Cool down to room temperature naturally after heat preservation, open the airtight container, take out the crucible, pour out the powder, wash with distilled water and absolute alcohol three times respectively, and dry in vacuum at 60°C for 8 hours.

[0024] figure 1 (a...

Embodiment 2

[0027] Add 0.1 g of lithium chloride, 0.16 g of ferrous chloride tetrahydrate, and 72 μL of phosphoric acid into 8 mL of absolute ethanol, stir for 2 minutes, add 12 mg of carbon nanotubes into the above-mentioned absolute alcohol solution, ultrasonicate and stir for 3 minutes each. Pour the anhydrous alcohol solution containing carbon nanotubes into the crucible, and then place the crucible on the upper part of the sealable container. 3mL ammonia water (0.05mol / L) is placed in the bottom of the sealable container in advance. After sealing the container, put it into an oven, start heating to 200°C, the heating rate is 10-20°C / min, and keep it warm for 10 hours after the temperature reaches the set temperature. Cool down to room temperature naturally after heat preservation, open the airtight container, take out the crucible, pour out the powder, wash with distilled water and absolute alcohol three times respectively, and dry in vacuum at 60°C for 8 hours.

[0028] figure 1 (...

Embodiment 3

[0031] Add 0.1 g of lithium chloride, 0.16 g of ferrous chloride tetrahydrate, and 72 μL of phosphoric acid into 8 mL of absolute ethanol, stir for 2 minutes, add 6 mg of carbon nanotubes into the above-mentioned absolute alcohol solution, ultrasonicate and stir for 3 minutes each. Pour the anhydrous alcohol solution containing carbon nanotubes into the crucible, and then place the crucible on the upper part of the sealable container. The bottom of the sealable container is pre-placed with 3mL ammonia water (0.1mol / L). After sealing the container, put it into an oven, start heating to 170°C, the heating rate is 10-20°C / min, and keep it warm for 24 hours after the temperature reaches the set temperature. Cool down to room temperature naturally after heat preservation, open the airtight container, take out the crucible, pour out the powder, wash with distilled water and absolute alcohol three times respectively, and dry in vacuum at 60°C for 8 hours.

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Abstract

The invention relates to a preparation method of a carbon-nanotube-modified lithium iron phosphate lithium ion battery positive electrode material. The method comprises the steps that: (1) lithium salt, ferrous salt, and a raw material comprising phosphate ions are dissolved in anhydrous lower alcohol, such that an anhydrous alcohol solution comprising lithium ions, ferrous ions, and phosphate ions is obtained; (2) carbon nanotubes are added into the anhydrous alcohol solution comprising lithium ions, ferrous ions, and phosphate ions; and a uniform mixture is obtained after ultrasonic processing and stirring; and (3) a crucible containing the mixture is placed on an upper part of a sealed container with a proper amount of ammonia water placed on the bottom in advance; the mixture and the ammonia water do not contact directly; the sealed container is heated to 150-250 DEG C, and the temperature is maintained for 72h; and the obtained powder is washed and dried, such that the material is obtained. The carbon-nanotube-modified lithium iron phosphate positive electrode material provided by the invention has the advantages of good crystallization and controllable carbon nanotube modification layer thickness. The preparation process requires no calcination treatment, such that the material is energy-saving and environment-friendly.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery cathode materials, in particular to a preparation method of carbon nanotube-modified lithium ferrous phosphate lithium-ion battery cathode materials. Background technique [0002] Because of its high open circuit voltage, long cycle life, high energy density, low self-discharge, no memory effect, and environmental friendliness, lithium-ion batteries have occupied the batteries of mobile phones and other portable digital products at an alarming rate since their appearance. market. However, how to further improve its energy density, power density, and high-rate charge-discharge performance has always been one of the difficulties in applying it to the field of electric vehicles on a large scale. In lithium-ion batteries, the performance of cathode materials is often the key factor that determines the electrochemical performance, safety performance and price of lithium-ion batteries....

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 张青红石福志王宏志李耀刚
Owner DONGHUA UNIV
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