Lithium iron phosphate with controllable morphology and preparation method of lithium iron phosphate

A technology of lithium iron phosphate and morphology, which is applied in the field of energy storage secondary lithium battery materials, can solve the problems of inconspicuous morphology, unstable voltage, and low uniformity, and achieve obvious morphology, high production efficiency, The effect of low equipment investment

Inactive Publication Date: 2014-08-27
GUIZHOU HONGYU METAL POWER SUPPLY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the defects of low uniformity, low crystallinity, inconspicuous morphology, and unstable voltage in the prior art of lithium iron phosphate with different shapes, the present invention provides a lithium iron phosphate with controllable morphology, which is characterized in that The morphology of lithium iron phosphate can be controlled by the control agent to obtain fibrous, flake, and spherical lithium iron phosphate particles with obvious morphology

Method used

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  • Lithium iron phosphate with controllable morphology and preparation method of lithium iron phosphate
  • Lithium iron phosphate with controllable morphology and preparation method of lithium iron phosphate
  • Lithium iron phosphate with controllable morphology and preparation method of lithium iron phosphate

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Experimental program
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Embodiment 1

[0039] 1) Mix the lithium source, iron source, and phosphorus source at a molar ratio Li:Fe:P=1:1:1, add an appropriate amount of buffer solution, mix and age for 24 hours, the lithium source is lithium nitrate; the iron The source is ferric nitrate; the phosphorus source is ammonium dihydrogen phosphate;

[0040] 2) Combine 95 parts by weight of the mixture obtained in step 1) with 3 parts by weight of thermoplastic starch, 1 part by weight of nitrogen-containing conjugated polymer polyvinyl carbazole, 0.5 parts by weight of control agent ammonium oxalate, 0.5 parts by weight High-quality processing lubrication aids, input into the vertical shaft reflective micro pulverizer, the rotor speed is controlled at 1200rpm, the strong stirring is for 5 minutes, the temperature is controlled at 80°C, through the dual pulverization function of blade cutting and high-speed airflow collision, during the blade cutting and pulverization process, the rotor Generate high-speed airflow to rot...

Embodiment 2

[0044] 1) Mix the lithium source, iron source, and phosphorus source in a molar ratio Li:Fe:P=1:1:1, add an appropriate amount of buffer solution, mix and age for 48 hours, the lithium source is lithium hydroxide; the The iron source is ferrous acetate; the phosphorus source is diammonium hydrogen phosphate;

[0045] 2) Mix 100 parts by weight of the mixture obtained in step 1) with 4 parts by weight of thermoplastic starch, 2 parts by weight of nitrogen-containing conjugated polymer polypyrrole, 1 part by weight of control agent magnesium chloride, and 0.5 parts by weight of processing lubricant The agent is input into the vertical shaft reflection micro pulverizer, the rotor speed is controlled at 1500rpm, the strong stirring is carried out for 10 minutes, and the temperature is controlled at 80°C. Through the double pulverization function of blade cutting and high-speed airflow collision, during the blade cutting and pulverization process, the rotor generates high-speed airf...

Embodiment 3

[0049] 1) Mix the lithium source, iron source, and phosphorus source in a molar ratio Li:Fe:P=1:1:1, add an appropriate amount of buffer solution, mix and age for 30 hours, the lithium source is lithium nitrate; the iron Source is ferric chloride; Described phosphorus source is diammonium hydrogen phosphate;

[0050] 2) Process 98 parts by weight of the mixture obtained in step 1) with 5 parts by weight of thermoplastic starch, 3 parts by weight of nitrogen-containing conjugated polymer polyaniline, 0.5 parts by weight of control agent silica, and 0.3 parts by weight Lubricating additives are input into the vertical shaft reflective micro pulverizer, the rotor speed is controlled at 1200rpm, the strong stirring is for 15 minutes, the temperature is controlled at 120°C, through the double pulverization function of blade cutting and high-speed airflow collision, during the blade cutting and pulverization process, the rotor generates high-speed The airflow rotates with the cuttin...

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Abstract

The invention discloses lithium iron phosphate with a controllable morphology and a preparation method of lithium iron phosphate. The lithium iron phosphate is characterized in that the morphology of the lithium iron phosphate can be controlled by a control agent; lithium iron phosphate particles with fibroid, flake and spherical morphologies and significant topographic characteristics are obtained by inhibiting and reducing the growth speeds of the lithium iron phosphate on different crystal faces. Furthermore, the preparation method comprises the following steps: plastifying and homogenizing materials by adopting two-stage reaction of a dynamic mill type screw reactor; carrying out crystallization reaction and shearing carbonization, thereby finally obtaining the lithium iron phosphate particles with different morphologies. The lithium iron phosphate obtained by the preparation method is not only obvious in topographic characteristics, but also even and stable, and high in degree of crystallinity, and can achieve continuous controllable production.

Description

technical field [0001] The invention relates to the field of energy storage secondary lithium battery materials, in particular to a shape-controllable lithium iron phosphate and a preparation method thereof. Background technique [0002] Olivine-type LiFePO for lithium-ion batteries 4 Cathode materials have become a research hotspot in recent years because of their stable structure, high theoretical specific capacity, abundant raw material sources, and environmental friendliness. However, the disadvantages of low electronic conductivity and small diffusion coefficient of lithium ions determined by the structure of the crystal itself reduce the reversible specific capacity during high-rate charge and discharge, which limits the large-scale commercial application of this material. Currently, enhanced LiFePO 4 The methods of improving the conductivity of materials and improving their high-current charge-discharge specific capacity mainly include particle miniaturization, ca...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 陈庆曾军堂
Owner GUIZHOU HONGYU METAL POWER SUPPLY TECH CO LTD
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