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Method for preparing lithium iron phosphate material and cladding the material with carbon

A technology of lithium iron phosphate and material package, which is applied in the direction of electrode manufacturing, etc., to achieve the effect of excellent material performance, small internal resistance and good conductivity

Inactive Publication Date: 2009-11-04
JIANGSU RUIDI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These three carbon addition methods are difficult to effectively and uniformly disperse and attach ultrafine carbon particles to the surface of lithium iron phosphate particles.

Method used

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  • Method for preparing lithium iron phosphate material and cladding the material with carbon
  • Method for preparing lithium iron phosphate material and cladding the material with carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] with Fe 2 o 3 , LiH 2 PO 4 As the main raw material, with MgO as the dopant, according to LiFe 0.98 Mg 0.02 PO 4 Ratio batching, the raw material is 500kg altogether. Add acetone as a dispersant, stir and ball mill for 2 hours, and dry in vacuum. It is continuously fed into the furnace from the furnace head of the rotary kiln. From the tail end of the rotary kiln, high-purity nitrogen with 10% acetylene is injected at a distance of 5m 3 The flow rate of / h is passed into the furnace and sintered at 655°C. The material starts to discharge continuously after sintering in the rotary kiln for 2 hours. The carbon-coated lithium iron phosphate cathode material is obtained after being cooled by a rotary cooling discharger, crushed and classified. figure 1 is the X-ray diffraction pattern of the product. figure 2 It is a scanning electron microscope photo of a carbon-coated lithium iron phosphate material product. Ultrafine nano-sized carbon particles are effective...

Embodiment 2

[0019] FePO 4 2H 2 O. Li 2 CO 3 As the main raw material, the raw material is 1000kg in total. Add acetone as a dispersant, stir ball mill for 4 hours, and vacuum dry. It is continuously fed into the furnace from the furnace head of the rotary kiln. High-purity nitrogen passes through a washing bottle filled with acetone and placed in a constant temperature water bath at 52°C to obtain a mixed gas of acetone and nitrogen. 3 The flow rate of / h is passed into the furnace from the tail end of the rotary kiln. Sintered at 655°C. The material starts to discharge continuously after sintering in the rotary kiln for 2 hours. The carbon-coated lithium iron phosphate cathode material is obtained after being cooled by a rotary cooling discharger, crushed and classified.

Embodiment 3

[0021] with Fe 2 o 3 , LiH 2 PO 4 As the main raw material, Mg(OH) 2 as a dopant, according to LiFe 0.98 Mg 0.02 PO 4 Ratio batching, the raw material is 500kg altogether. Add acetone as a dispersant, stir and ball mill for 2 hours, and dry in vacuum. Continuously feed into the furnace from the furnace head of the rotary kiln. High-purity nitrogen passes through a generation tube equipped with naphthalene and placed at a constant temperature of 175°C to obtain a mixed gas of naphthalene vapor and nitrogen. 3 The flow rate of / h is passed into the furnace from the tail end of the rotary kiln. Sintered at 655°C. The material starts to discharge continuously after sintering in the rotary kiln for 2 hours. The carbon-coated lithium iron phosphate cathode material is obtained after being cooled by a rotary cooling discharger, crushed and classified.

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PUM

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Abstract

The invention discloses a method for preparing lithium iron phosphate material and cladding the material with carbon. The method relates to the industrialized production of lithium ion cell anode material. The method is characterized by comprising the following steps: introducing the mixed gas of carbon containing gaseous organic matter and high purity nitrogen gas into a revolving furnace sintering lithium iron phosphate; carbonizing the carbon containing gaseous organic matter into nano carbon and carbon nano tubes under the sintering condition of high temperature and no oxygen; and dispersing the nano carbon and carbon nano tubes evenly and cladding the surfaces of the lithium iron phosphate particles with the nano carbon and carbon nano tubes so as to make the synthesized lithium iron phosphate material show excellent heavy current charging and discharging performances. Simultaneously, the reducing atmosphere produced by the carbon containing organic gas in the carbonization process can be used to rapidly reduce ferric iron and quicken the generation of lithium iron phosphate.

Description

technical field [0001] The invention belongs to a method for manufacturing a cathode material of a lithium ion battery in the field of energy materials. Background technique [0002] Lithium iron phosphate (LiFePO) with olivine structure 4 ) material, which has a stable crystal structure. It is recognized as the best cathode material for manufacturing high-safety, low-cost, and long-life lithium-ion batteries. But the material conducts electricity poorly. People increase the conductivity of the material by coating the surface of the particles with carbon. At present, there are three methods of coated carbon technology: 1. Add a certain amount of ultra-fine carbon powder directly to the raw material through ball milling, and these conductive carbons are dispersed in the lithium iron phosphate product after sintering; 2. Add a certain amount of carbon powder containing Carbon macromolecular organic matter, such as sugar, polypropylene, etc., is carbonized during the sinter...

Claims

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Application Information

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IPC IPC(8): H01M4/04
CPCY02E60/12Y02E60/10
Inventor 喻维杰
Owner JIANGSU RUIDI ENERGY TECH
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