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Method for preparing carbon coated lithium ferrous phosphate composite material including metal conductive agent

A carbon-coated lithium ferrous phosphate, metal conductive technology, applied in electrode manufacturing, circuits, electrical components, etc., can solve the problems of complex preparation process, increased cost, and difficult to control product purity, and achieves narrow particle distribution and phase. The effect of uniform composition and improved electronic conductivity

Inactive Publication Date: 2005-08-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses the higher priced Fe 2+ Compound as iron source, glucose as Ag + Reductant, the synthesis process requires an inert atmosphere (N 2 ) protection, the product purity is not easy to control, the preparation process is complicated, and the cost increases

Method used

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  • Method for preparing carbon coated lithium ferrous phosphate composite material including metal conductive agent
  • Method for preparing carbon coated lithium ferrous phosphate composite material including metal conductive agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 0.05 mol Fe(NO 3 ) 3 9H 2 O, 0.001 mole AgNO 3 Place it in a beaker, add deionized water to form a 0.5 mol / L solution, and weigh 0.4 mol citric acid to add to the solution. Stir and place it in a constant temperature water bath at 90°C for 60 minutes to obtain a yellow clear solution, and then add 0.05 moles of NH to the clear solution 4 h 2 PO 4 , stirred and dissolved, and then added 0.05 moles of LiOH·H 2 O, a yellow solution was obtained after stirring and dissolving. A yellow sol was obtained after constant temperature at 90°C for 2 hours. Then transfer to an oven at 120° C. for 5 hours to obtain light yellow gel. Grind and evenly mix with 2.5 grams of polypropylene powder and put them together in a tube furnace, rise to 700°C at a rate of 5°C / min in a nitrogen flow of 5 liters / min, and keep at this temperature for 10 hours. After natural cooling in the furnace, the black powder is ground, which is carbon-coated lithium iron phosphate (LiFePO4) containing ...

Embodiment 2

[0028] 0.04 moles of Fe(NO 3 ) 3 9H 2 O, 0.002 mole AgNO 3 Place it in a beaker, add deionized water to form a 0.5 mol / L solution, and weigh 0.6 mol citric acid to add to the solution. Stir and place it in a constant temperature water bath at 90°C for 80 minutes to obtain a yellow clear solution, and then add 0.04 moles of NH 4 h 2 PO 4 and 0.04 mol LiOH·H 2 O, a yellow solution was obtained after stirring and dissolving. A yellow sol was obtained after constant temperature at 90°C for 3 hours. Then transfer to an oven at 110° C. for 8 hours to obtain light yellow gel. Grind and evenly mix with 3 grams of polypropylene powder and put them together in a tube furnace, raise it to 600°C at a rate of 5°C / min in a nitrogen flow of 5 liters / min, and keep it at this temperature for 15 hours. After natural cooling in the furnace, the black powder is ground, which is carbon-coated lithium iron phosphate (LiFePO4) containing metal Ag conductive agent. 4 / Ag / C) composite cathod...

Embodiment 3

[0030] 0.05 mol Fe(NO 3 ) 3 9H 2 O, 0.001 mole Cu(NO 3 ) 2 ·3H 2 O was placed in a beaker, and deionized water was added to form a 0.5 mol / L solution, and 0.5 mol citric acid was weighed and added to the solution. Stir and place it in a constant temperature water bath at 100°C for 60 minutes to obtain a light yellow clear solution, and then add 0.05 mol NH to the clear solution 4 h 2 PO 4 , stirred and dissolved, and then added 0.05 moles of LiOH·H 2 O, a yellow solution was obtained after stirring and dissolving. A yellow sol was obtained after constant temperature at 90°C for 2 hours. Then transfer to an oven at 120° C. for 5 hours to obtain light yellow gel. Grind and evenly mix with 3 grams of polypropylene powder and put them together in a tube furnace, raise it to 500°C at a rate of 5°C / min in a nitrogen flow of 5 liters / min, and keep it at this temperature for 10 hours. After natural cooling in the furnace, the black powder is ground, which is carbon-coated l...

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Abstract

This invention relates to a preparation method for LiFe PO4 / M / C compound positive material, the precursor of Li-Fe-PO4-M is synthesized with Li salt, Fe compound, phosphate, silver salt and organic acid as the raw materials by the sol-coagel method. Then the precursor mixed with pyrogenic-decomposed in inert atmosphere to get LiFePO4 / M / C compound positive material.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a carbon-coated lithium ferrous phosphate (LiFePO 4 / M / C) preparation method of composite cathode material. Background technique [0002] LiFePO with olivine structure 4 (Lithium ferrous phosphate) positive electrode material has abundant raw material sources, low price, no environmental pollution, high capacity (theoretical capacity is 170mAh / g, energy density is 550Wh / Kg), excellent cycle performance, good stability, and the prepared battery The outstanding safety performance and other advantages make it have a great market prospect in various power supply fields, especially in the field of large-scale power supply required by electric vehicles. Thus making LiFePO 4 Become a new generation of lithium-ion battery cathode material with the most development and application potential. [0003] However, the material's low electrical conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/00H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 赵新兵米常焕曹高劭
Owner ZHEJIANG UNIV
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