Method for making positive material positive ferric phosphate of lithium battery

A technology of ferric orthophosphate and positive electrode materials, applied in the direction of electrode manufacturing, battery electrodes, phosphate, etc., can solve the problems of low surface activity, small specific capacity of secondary batteries, wide distribution of ferric orthophosphate particles, etc., to improve activity, Effects of improving performance and expanding the range of use

Inactive Publication Date: 2008-08-06
河南瑞贝佳生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ferric orthophosphate particles produced by the existing production method have a wide distribution, and the intergranular agglomeration phenomenon is serious, resulting in low surface activity. It is used to prepare lithium iron phosphate, the positive electrode material of lithium batteries, and the prepared secondary battery has a small specific capacity, and Unstable product quality directly limits the scope of use of lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of iron orthophosphate used for lithium battery cathode material according to the present invention is carried out according to the following steps:

[0020] at 1m 3 Add 150kg of water and 27.5kg of ferrous sulfate heptahydrate into the enamel reaction kettle, dissolve the solid under stirring, add 12.5kg of phosphoric acid, and add 9kg of hydrogen peroxide with a concentration of 28% within 1 hour to completely convert the ferrous iron in the solution For ferric iron, adjust the solution temperature to 55°C, add 47kg of sodium carbonate solution with a concentration of 10% under stirring, the flow rate is 10L / h, then raise the temperature to 95°C and keep it warm for 6 hours, and introduce the solution into a 6-stage cyclone while keeping it warm Separation of soluble inorganic salts in the medium, and at the same time, the product is swirled at high speed in the cyclone to form spherical particles; after the sulfate content in the product is sep...

Embodiment 2

[0022] The preparation method of iron orthophosphate used for lithium battery cathode material according to the present invention is carried out according to the following steps:

[0023] at 10m 3 Add 3000kg of water and 570kg of ferrous sulfate heptahydrate into the enamel reaction kettle, dissolve the solid under stirring, then add 250kg of phosphoric acid, and add 185kg of hydrogen peroxide with a concentration of 28% in 1 hour, so that the ferrous iron in the solution is completely converted into Ferric iron, adjust the solution temperature to 50°C, add 950kg of sodium carbonate solution with a concentration of 10% under stirring, flow rate is 200L / h, raise the temperature to 85°C and keep it warm for 15h, and introduce the solution into a 6-stage cyclone for separation while keeping warm Soluble inorganic salt, at the same time, the product is swirled at high speed in the cyclone to form spherical particles; after the sulfate content in the product is separated to less th...

Embodiment 3

[0025] The preparation method of iron orthophosphate used for lithium battery cathode material according to the present invention is carried out according to the following steps:

[0026] at 10m 3 Add 3000kg of water and 570kg of ferrous sulfate heptahydrate into the enamel reaction kettle, dissolve the solid under stirring, then add 250kg of phosphoric acid, and add an aqueous solution containing 40kg of sodium chlorate within 1 hour to completely convert the ferrous iron in the solution into For ferric iron, adjust the solution temperature to 50°C, add 950kg of sodium carbonate solution with a concentration of 10% under stirring, the flow rate is 200L / h, then raise the temperature to 90°C and keep it warm for 8h, and introduce the solution into a 6-stage cyclone while keeping warm Separation of soluble inorganic salts, at the same time, the product is swirled at high speed in the cyclone to form spherical particles; after the sulfate content in the product is separated to le...

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Abstract

The present invention discloses a preparation method for ferric orthophosphoric acid which is lithium battery anode material, using 100 portions of ferrous sulfate heptahydrate, 41.8-48.8 portions of phosphoric acid, 21.8-38.5 portions of hydrogen peroxide or 6.36-10.0 portions of sodium chlorate, 12.0-12.5 portions of sodium hydroxide or 15.0-18.0 portions of sodium carbonate and 500-1000 portions of water for preparation. The ferrous sulfate heptahydrate, the phosphoric acid and the water are compounded into solution in a reaction vessel; the hydrogen peroxide or the sodium chlorate is added into the solution; the temperature of the solution is 50-55 DEG C, and the sodium hydroxide or the sodium carbonate is added into the solution under the condition of stirring; then the solution temperature is increased to be between 85 DEG C and 95 DEG C; the temperature is kept for 5-15 hours, and in the meantime, the solution is led into a swirler to be separated till the sulfate radical content in products is less than 0.2 percent; the solution is cooled to be at 50 DEG C for carrying out the solid-liquid separation of the products and liquid; the particle diameter of obtained ferric orthophosphoric acid is 1-2 mu m; the specific surface area of the ferric orthophosphoric acid is 48-55.5m2 / g; the tap density of the ferric orthophosphoric acid is greater than 1.6g / cm3. When the ferric orthophosphoric acid prepared with the method is used as raw material for preparing lithium iron phosphate via solid phase synthesis, the lithium battery anode material with excellent performance can be obtained.

Description

technical field [0001] The invention relates to a lithium battery material, in particular to a preparation method of iron orthophosphate, a cathode material of a lithium battery. Background technique [0002] The development and construction of clean energy is one of the most important fields of development in the world, and batteries are an important medium for rational and effective use of these new energy sources. Lithium-ion batteries have developed rapidly in the weak current industry, the research and development of power lithium batteries are becoming more and more mature, and the development of electric vehicles (EV) will bring revolutionary changes to the improvement of people's environment. The key technology of electric vehicle manufacturing is the battery problem. Studies have shown that lithium batteries are the preferred battery for electric vehicle power. The key technology for preparing power lithium batteries is battery materials, especially the positive ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/26
CPCY02E60/10
Inventor 王宏雁梅志恒
Owner 河南瑞贝佳生物科技有限公司
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