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Method for preparing linear nano carbon conductive agent coated lithium iron phosphate anode material

A lithium iron phosphate and nano-carbon technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult dispersion and easy agglomeration, and achieve the effects of being conducive to heat dissipation, improving electrical conductivity, and improving high and low temperature performance.

Inactive Publication Date: 2013-03-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, linear nanocarbon is a nanoscale material, and under the action of van der Waals force, it is very easy to agglomerate and difficult to disperse.

Method used

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  • Method for preparing linear nano carbon conductive agent coated lithium iron phosphate anode material
  • Method for preparing linear nano carbon conductive agent coated lithium iron phosphate anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1) After heating 0.5g of linear nano-carbon to reflux in 100°C mixed acid (the mixed acid of analytically pure concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1) for 3 hours, dissolve it in 100ml of polyacrylate with a concentration of 4g / L solution, and then put it in a 50°C water bath, and ultrasonically disperse the above solution for 2 hours to prepare a uniformly dispersed linear nanocarbon solution;

[0020] 2) Dissolve 0.2 g of fine gelatin powder in 30 ml of deionized water, stir at 50°C, and sonicate for 30 minutes, then add 20 grams of lithium iron phosphate particles (average particle size 5 microns), stir and sonicate for 30 minutes, then add the above Linear nano carbon solution 200ml. Stir the mixed solution, sonicate, and use acetic acid to adjust the pH value to 4.0. After 30 minutes, the mixed solution is repeatedly washed and filtered, and finally the solid is dried at 250 ° C. After natural cooling, the linear nano-carb...

Embodiment 2

[0023] 1) After heating 0.55g of linear nano-carbon to reflux for 3.5h in 95°C mixed acid (acid of analytically pure concentrated sulfuric acid and concentrated nitric acid mixed according to the volume ratio of 3:1), dissolve it in 200ml of polyacrylate with a concentration of 3g / L solution, then put it in a 55°C water bath, and ultrasonically disperse the above solution for 2.5 hours to prepare a uniformly dispersed linear nanocarbon solution;

[0024] 2) Dissolve 0.18 g of fine gelatin powder in 40 ml of deionized water, stir and sonicate at 55°C for 35 minutes, add 10 grams of lithium iron phosphate particles (average particle size 4.8 microns), stir and sonicate for 30 minutes, then add the above 300ml of linear nano-carbon solution. Stir the mixed solution, sonicate, and adjust the pH value to 4.0 with acetic acid. After 28 minutes, the mixed solution is repeatedly washed and filtered, and finally the solid is dried at 300 ° C. After natural cooling, the linear nano-car...

Embodiment 3

[0027] 1) After heating 0.45g of linear nano-carbon to reflux for 1.5h in 90°C mixed acid (acid of analytically pure concentrated sulfuric acid and concentrated nitric acid mixed according to the volume ratio of 3:1), dissolve it in 150ml of polyacrylate with a concentration of 2g / L solution, and then put it in a 55°C water bath, and ultrasonically disperse the above solution for 1.5h to prepare a uniformly dispersed linear nanocarbon solution.

[0028] 2) Dissolve 0.55 g of fine gelatin powder in 20 ml of deionized water, stir and sonicate at 45°C for 30 minutes, add 20 grams of lithium iron phosphate particles (average particle size 5 microns), stir and sonicate for 25 minutes, then add the above 180ml of linear nano-carbon solution. Stir the mixed solution, sonicate, and use acetic acid to adjust the pH value to 4.5. After 30 minutes, the mixed solution is washed and filtered repeatedly, and finally the solid is dried at 220 ° C. After natural cooling, the linear nano-carb...

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Abstract

The invention discloses a method for preparing a linear nano carbon conductive agent coated lithium iron phosphate anode material. The method comprises the following steps of: 1) dissolving 0.15 to 0.65 gram of linear nano carbon into 50 to 300 milliliters of 1 to 4g / L solution of polyacrylate, putting the solution into a water bath of 30 to 80 DEG C, and performing ultrasonic dispersion on the solution for 1.5 to 2.5 hours to obtain uniformly dispersed linear nano carbon solution; 2) dissolving fine gelatin powder into deionized water, stirring, performing ultrasonic treatment for 30 minutes, adding lithium iron phosphate particles in a ratio, stirring, performing ultrasonic treatment for 30 minutes, and adding 100 to 300 milliliters of linear nano carbon solution to obtain mixed solution; and 3) stirring the mixed solution, performing ultrasonic treatment on the mixed solution, regulating the pH value to be between 3 and 6 by using acetic acid, repeatedly flushing and filtering the mixed solution after 30 minutes, and drying and cooling the solid to obtain linear nano carbon coated lithium iron phosphate particles. By the method, the linear nano carbon is in uniform network distribution on the surface of the lithium iron phosphate particles, the electric conductivity of the powdery lithium iron phosphate and the charge / discharge efficiency of the electrode can be improved, and the high and low-temperature performance of the battery can be improved.

Description

technical field [0001] The invention relates to the field of battery preparation, in particular to a method for coating lithium iron phosphate cathode materials with linear nano-carbon as a conductive agent. Background technique [0002] The performance of lithium-ion batteries mainly depends on the positive and negative electrode materials. Lithium iron phosphate as the positive electrode material of lithium batteries has only appeared in recent years. The domestic development of large-capacity lithium iron phosphate batteries was in July 2005. Its safety performance and cycle life are unmatched by other materials, and these are the most important technical indicators of power batteries. 1C charge and discharge cycle life up to 2000 times. The overcharge voltage of a single battery is 30V, it does not burn, and it does not explode when punctured. Lithium iron phosphate cathode materials make large-capacity lithium-ion batteries easier to use in series to meet the needs of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 杨小华杨植范泽夫钟文斌刘云泉
Owner HUNAN UNIV
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