A kind of preparation method and product thereof of lithium iron phosphate material with high capacity and high compaction density

A lithium iron phosphate, high-pressure compaction technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low compaction density of powder, difficult to crush, low compaction density of pole pieces, etc., to achieve The effect of shortening the required time, improving production efficiency, and increasing the uniformity of carbon coating

Inactive Publication Date: 2011-12-14
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention also uses ferric oxide and iron oxyhydroxide as the iron source and organic compounds as the carbon source in view of the prior art, and the prepared lithium iron phosphate secondary particles are agglomerated and difficult to crush, resulting in low powder compaction density , the defect of low compaction density of the pole piece, a preparation method of lithium iron phosphate, the positive electrode material of lithium ion battery, is provided. The invention adopts a specific addition method combining inorganic carbon source and organic carbon source, and the produced lithium iron phosphate The material has the excellent characteristics of high powder compaction density and pole piece compaction density

Method used

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  • A kind of preparation method and product thereof of lithium iron phosphate material with high capacity and high compaction density
  • A kind of preparation method and product thereof of lithium iron phosphate material with high capacity and high compaction density
  • A kind of preparation method and product thereof of lithium iron phosphate material with high capacity and high compaction density

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Effect test

Embodiment 1

[0045] 3080 grams of lithium hydroxide monohydrate, 6209 grams of iron oxyhydroxide (specific surface area 100m 2 / g and the primary particle size of the particles is less than 100nm), 8444 grams of ammonium dihydrogen phosphate, 117 grams of titanium dioxide and 1046 grams of sucrose are mixed, put into a wet stirring ball mill, add 30 kg of water, add 200 kg of zirconia balls, and mix for 5 hours after ball milling , to obtain a mixed slurry with a particle size of D50=200-600nm, and then use a centrifugal spray dryer to obtain a spray powder under the conditions of an inlet temperature of 200°C and an outlet temperature of 100°C; the spray The powder is put into an atmosphere protection furnace, and under a nitrogen atmosphere of 10 liters / min, the temperature is raised to 400°C at a rate of 3°C / min for 2 hours, and then cooled to room temperature at a rate of 2°C / min to obtain a pre-fired product. 14kg pre-burned product, 56g specific surface area is 770m 2 / g of superfin...

Embodiment 2

[0050] 3080 grams of monohydrate lithium hydroxide, 6394 grams of iron oxyhydroxide (specific surface area 100m 2 / g and the primary particle size of the particles is less than 100nm), 8444 grams of ammonium dihydrogen phosphate, 64 grams of magnesium hydroxide and 1046 grams of sucrose are mixed, put into a wet stirring ball mill, add 30 kg of water, add 200 kg of zirconia balls, and mix by ball milling for 2 Hours later, a mixed slurry with a particle size of D50=200-600nm was obtained, and then the mixed slurry was used in a centrifugal spray dryer to obtain a spray powder at an inlet temperature of 230°C and an outlet temperature of 100°C; The sprayed powder is placed in an atmosphere protection furnace, and under a nitrogen atmosphere of 10 liters / min, the temperature is raised to 400°C at a rate of 5°C / min for 4 hours, and then the rate is lowered to room temperature at a rate of 3°C / min to obtain pre-calcined product. 14kg pre-burned product, 252g specific surface area...

Embodiment 3

[0053] 3080 grams of monohydrate lithium hydroxide, 5746 grams of ferric oxide (specific surface area 10m 2 / g and the primary particle size of the particles is less than 100nm), 8444 grams of ammonium dihydrogen phosphate, 97.6 grams of niobium pentoxide and 1060 grams of sucrose are mixed, put into a wet stirring ball mill, add 30 kg of water, add 200 kg of zirconia balls, and mix by ball milling After 2 hours, a mixed slurry with a particle size of D50=200-600nm was obtained, and then the mixed slurry was used in a centrifugal spray dryer to obtain a spray powder under the conditions of an inlet temperature of 220°C and an outlet temperature of 95°C; Put the sprayed powder into an atmosphere protection furnace, raise the temperature at a rate of 3°C / min to 400°C for 2 hours under a nitrogen atmosphere of 20 liters / min, and then lower it to room temperature at a rate of 2°C / min to obtain the desired Burn the product. 14kg pre-burned product, 54.6g specific surface area is 7...

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Abstract

The invention belongs to the field of positive electrode materials for lithium ion batteries, and discloses a method for preparing lithium iron phosphate materials with high capacity and high compaction density, including (1) combining lithium source, Fe3+ source, phosphate, dopant and organic carbon source Mixing, and then spray granulation, (2) prepare calcined product, (3) mix and sand the calcined product and inorganic carbon source, and then spray dry to obtain secondary spray powder, (4) secondary spray The powder is heat-treated in vacuum or in a protective atmosphere, and sintered at a constant temperature; (5) After the above-mentioned sintered semi-finished product is passed through secondary ball milling or jet milling, a lithium iron phosphate product is obtained. The invention solves the defects of increased product cost, difficult coating and low compaction density of pole pieces caused by the use of divalent iron source, and has the characteristics of low production cost and good processability, electrical conductivity and electrochemical performance of prepared pole pieces .

Description

technical field [0001] The invention belongs to the field of positive electrode materials of lithium ion batteries, and specifically provides a preparation method of a high-capacity and high-compact-density lithium iron phosphate material and a product thereof. Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries are widely used due to their advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. Lithium iron phosphate is a new generation of lithium-ion battery cathode material, because of its low price, high theoretical capacity (about 170mAh / g), stable working voltage, non-toxic and environmentally friendly, stable structure, good safety, good thermal stability and long life It has become a hot spot of current research because of its high cycle life, and it is one of the best cathode materials for automotive power supplies. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/1397H01M4/58
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 王国光程大洋俞晓峰包大新陈文洪
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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