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A kind of preparation method of carbon nanotube modified lithium manganese phosphate lithium ion battery cathode material

A technology of lithium-ion batteries and carbon nanotubes, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low electron conduction rate migration rate, restrict charge and discharge performance, hinder the commercial application of lithium manganese phosphate, etc., and achieve chemical High potential and good crystallization effect

Inactive Publication Date: 2015-12-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it also has low electron conductivity and Li + The migration rate seriously restricts the charge and discharge performance of the material, which greatly hinders the commercial application of lithium manganese phosphate

Method used

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  • A kind of preparation method of carbon nanotube modified lithium manganese phosphate lithium ion battery cathode material
  • A kind of preparation method of carbon nanotube modified lithium manganese phosphate lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 0.1 g of lithium chloride, 0.16 g of manganese 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.

[0025] figure 1 ...

Embodiment 2

[0027] Add 0.1 g of lithium chloride, 0.16 g of manganese 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

[0030] Add 0.1 g of lithium chloride, 0.16 g of manganese chloride tetrahydrate, and 72 μL of phosphoric acid into 8 mL of absolute ethanol, stir for 2 minutes, add 24 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.

[0031] figure 1...

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Abstract

The invention relates to a preparation method for carbon nano-tube modified manganese phosphate lithium ion cell anode materials. The preparation method comprises the following steps: (1) lithium salt, manganese salt and other raw materials containing phosphate anions are dissolved in anhydrous low alcohol to obtain an anhydrous alcoholic solution containing lithium ions, manganese ions and the phosphate anions; (2) a carbon nano-tube is added into the anhydrous alcoholic solution containing the lithium ions, the manganese ions and the phosphate anions, and subjected to ultrasound processing and stirring to obtain a uniform mixture; (3) a crucible containing the mixture is placed in the upper portion of an airtight container, wherein an appropriate amount of ammonium hydroxide is placed at the bottom of the airtight container in advance, the mixture and the ammonium hydroxide are not in direct contact, and then the airtight container is heated to 100-250 DEG C and preserved at the temperature for 1-72 hours; lastly, obtained powder is washed and dried to obtain the carbon nano-tube modified manganese phosphate lithium ion cell anode materials. The carbon nano-tube modified manganese phosphate lithium ion cell anode materials obtained through the preparation method have the advantages of being good in crystallization, high in chemical potential and the like.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode materials of lithium ion batteries, in particular to a preparation method of carbon nanotube-modified lithium manganese phosphate lithium ion battery positive electrode materials. Background technique [0002] With the increasingly prominent energy and environmental issues, the development of electric vehicles, especially pure electric vehicles, is imperative. At present, the bottleneck restricting the development of electric vehicles is whether to develop cheap, safe and high energy density secondary batteries. As a secondary battery, lithium-ion batteries have the advantages of high open circuit voltage, long cycle life, and environmental friendliness. However, how to further improve their open circuit voltage, energy density, and reduce their cost has always been the problem of large-scale application in the field of electric vehicles. One of the puzzles. Therefore, it is of g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 张青红石福志王宏志李耀刚
Owner DONGHUA UNIV
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