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Composite anode material for lithium ion battery

A composite positive electrode material and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low diffusion coefficient of lithium ions, achieve broad application prospects, improve lithium ion diffusion performance, and good toughness

Active Publication Date: 2012-06-27
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of composite cathode material needle for lithium ion battery, to overcome the shortcoming of existing carbon nanotube / lithium iron phosphate composite cathode material lithium ion diffusion coefficient is low

Method used

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  • Composite anode material for lithium ion battery
  • Composite anode material for lithium ion battery
  • Composite anode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 1g of carbon nanotubes in a mixture of 75ml of concentrated nitric acid and 25ml of concentrated sulfuric acid, reflux at 90°C for 12h, cool to room temperature and dilute with a large amount of deionized water, then filter and wash repeatedly with deionized water until the filtrate is neutral. Dry to obtain acidified carbon nanotubes. The acidified carbon nanotubes were placed in 5 mL of anhydrous N,N-dimethylformamide, and after ultrasonic oscillation at room temperature for 40 min, 100 g of thionyl chloride was added, stirred mechanically and heated to 80° C. for reflux reaction for 24 h. After cooling to room temperature, the filtrate was filtered and washed repeatedly with anhydrous tetrahydrofuran until the filtrate was colorless, and the solid matter was vacuum-dried at 50° C. for 5 h to obtain acyl chloride carbon nanotubes. Disperse carbonyl chloride carbon nanotubes in 25mL of anhydrous N,N-dimethylformamide, ultrasonically shake at room temperature for 40...

Embodiment 2

[0024]Put 1g of carbon nanotubes in a mixture of 25ml of concentrated nitric acid and 75ml of concentrated sulfuric acid, reflux at 100°C for 10h, cool to room temperature and dilute with a large amount of deionized water, then filter, wash repeatedly with deionized water until the filtrate is neutral, and dry acidified carbon nanotubes. The acidified carbon nanotubes were placed in 50 mL of anhydrous N,N-dimethylacetamide, and after ultrasonic oscillation at room temperature for 20 min, 200 g of oxalyl chloride was added, mechanically stirred and heated to 60° C. for reflux reaction for 36 h. After filtration and repeated washing with anhydrous tetrahydrofuran until the filtrate was colorless, the solid matter was vacuum-dried at 80° C. for 0.5 h to obtain acyl chloride carbon nanotubes. Disperse carbonyl chloride nanotubes in 50mL of anhydrous N,N-dimethylacetamide, ultrasonically shake at room temperature for 20min, add 50g of polyoxypropylene, heat to 120°C under nitrogen ...

Embodiment 3

[0027] Place 1g of carbon nanotubes in a mixture of 100ml of concentrated nitric acid and 100ml of concentrated sulfuric acid, reflux at 120°C for 2 hours, cool to room temperature, dilute with a large amount of deionized water, then filter, wash repeatedly with deionized water until the filtrate is neutral, and dry acidified carbon nanotubes. The acidified carbon nanotubes were placed in 25 mL of anhydrous tetrahydrofuran, and after ultrasonic oscillation at room temperature for 30 min, 150 g of phosphorus trichloride was added, mechanically stirred and heated to 90° C. for reflux reaction for 12 h. After the reaction was completed, the solid matter was vacuum-dried at 70° C. for 3 h to obtain carbonyl chloride carbon nanotubes after suction filtration and repeated washing with anhydrous tetrahydrofuran. Disperse carbonyl chloride carbon nanotubes in 5 mL of anhydrous tetrahydrofuran, ultrasonically oscillate at room temperature for 40 minutes, add random copolymer of oxyethy...

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Abstract

For solving the defect that the current carbon nanometre tube / lithium iron phosphate composite anode material has a low lithium-ion diffusion coefficient, ion conductive polymer with good lithium ion diffusion ability is selected and grafted on the carbon nanometre tube by a chemical bond. The invention provides a novel composite anode material for a lithium ion battery and a preparation method thereof. The preparation method specifically comprises the following steps of: acidulating the carbon nanometre tube to acquire the carbon nanometre tube with a carboxylic group on the surface; transforming the carboxylic group to be an acyl chloride radial with high activity by chlorization reagent, acquiring carbon nanometre tube grafted with ion conductive polymer through the reaction of acyl chloride and an active group on the polymer end; ultrasonically dispersing the carbon nanometre tube grafted with ion conductive polymer with lithium iron phosphate in water or organic solvent to acquire a mixture, namely the composite anode material with good toughness, which can improve the power output of the battery, remarkably improve the charge-discharge performances of the battery under a high rate and improve the cycle life of the battery.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to an ion-conducting polymer grafted carbon nanotube / lithium iron phosphate composite cathode material and a preparation method thereof. Background technique [0002] As a new type of secondary battery, lithium-ion batteries have the advantages of high voltage, high specific energy, long charge and discharge life, no memory effect, less environmental pollution, fast charging, and low self-discharge rate compared with other rechargeable batteries. . As an important class of chemical batteries, lithium-ion batteries are not only used as power sources in mobile phones, notebook computers, digital cameras, and portable small electrical appliances, but also gradually move towards the fields of electric vehicles, aerospace, military mobile communications, and equipment. Will be bigger and bigger, and is expected to show explosive growth in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/136H01M4/137
CPCY02E60/122Y02E60/10
Inventor 解孝林龚春丽周兴平邓立廖永贵
Owner HUAZHONG UNIV OF SCI & TECH
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