Preparation method of high-vibration-compaction low-specific-surface-area lithium iron phosphate made by positive pole material

A low specific surface area, positive electrode material technology, applied in the direction of chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of poor processing performance, low tap density, high specific surface area, etc., to achieve good electrochemical performance, vibration The effect of high density and low specific surface area

Active Publication Date: 2013-03-13
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of poor processability due to the low tap density and high specific surface area of ​​the carbon-coated lithium iron phosphate positive electrode material prepared in the prior art, and to provide a method that can significantly improve the processability of the lithium iron phosphate positive electrode material, but other Preparation method of high-tapped low-specific-surface-area positive electrode material lithium iron phosphate with unaffected electrochemical performance

Method used

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  • Preparation method of high-vibration-compaction low-specific-surface-area lithium iron phosphate made by positive pole material
  • Preparation method of high-vibration-compaction low-specific-surface-area lithium iron phosphate made by positive pole material
  • Preparation method of high-vibration-compaction low-specific-surface-area lithium iron phosphate made by positive pole material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 5.1molLi 2 CO 3 , 10.0mol NH 4 h 2 PO 4 , 5.0molFe 2 o 3 Add to the mixing tank, add 850ml deionized water, add 0.05molMnO while stirring 2 , 0.05molTiO 2 , 110g of glucose and 25g of polyacrylic acid, stirred and mixed evenly, transferred to a ball mill for ball milling for 2-3 hours, and the obtained slurry was sprayed and granulated to form a powder. powder in N 2 Sintering in a rotary furnace at 450°C for 5h in the atmosphere. After cooling, put it into a mixing tank, add 400g of water-soluble starch, 25g of polyacrylic acid and 850ml of deionized water, stir and mix evenly, transfer to a ball mill for 2~3 hours, and spray the obtained slurry to form a powder. The powder was added into the rotary kiln, under N 2 Sinter at 650°C for 10 hours in the atmosphere, then heat up to 800°C for 20 hours, cool, sieve, classify and obtain the product.

[0024] The tap density of the resulting product is 1.80g / cm -3 , the specific surface area is 6.0m 2 / g, the carb...

Embodiment 2

[0028] 5.1molLi 2 CO 3 , 10.0mol FePO 4 Add to the mixing tank, add 900ml deionized water, add 0.05molMnO while stirring 2 , 0.05molMgO, 120g sucrose and 25g polyacrylic acid, stirred and mixed evenly, transferred to a ball mill for ball milling for 2-3 hours, and the obtained slurry was sprayed and granulated to form a powder. powder in N 2 Sintering in a rotary furnace at 450°C for 9h in the atmosphere. After cooling, transfer to a stirring tank, add 400g chitosan, 25g polyethylene glycol and 860ml deionized water, stir and mix evenly, transfer to a ball mill for ball milling for 2-3 hours, and spray the obtained slurry to form a powder. The powder was added into the rotary kiln, under N 2 Sinter at 650°C for 10 hours in the atmosphere, then heat up to 800°C for 20 hours, cool, sieve, classify and obtain the product.

[0029] The tap density of the resulting product is 1.76g / cm -3 , the specific surface area is 6.2m 2 / g, the carbon content is 1.70%.

[0030] The ma...

Embodiment 3

[0032] 5.1molLi 2 CO 3 , 10.0mol FePO 4 Add to the mixing tank, add 900ml deionized water, add 0.03molMnO while stirring 2 , 0.03molV 2 o 5 , 0.04molMgO, 120g fructose and 25g polyethylene glycol, stirred and mixed evenly, transferred to a ball mill for ball milling for 2-3 hours, and the obtained slurry was sprayed and granulated to form a powder. powder in N 2 Sintering in a rotary furnace at 480°C for 8h in the atmosphere. After cooling, transfer to a stirring tank, add 400g chitosan, 25g polyethylene glycol and 860ml deionized water, stir and mix evenly, transfer to a ball mill for ball milling for 2-3 hours, and spray the obtained slurry to form a powder. The powder was added into the rotary kiln, under N 2 Sinter at 600°C for 15 hours in the atmosphere, then heat up to 820°C for 20 hours, cool, sieve, classify and obtain the product.

[0033] The tap density of the resulting product is 1.70g / cm -3 , the specific surface area is 6.5m 2 g, the carbon content is 1...

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Abstract

The invention relates to a preparation method of high-vibration-compaction low-specific-surface-area lithium iron phosphate made by a positive pole material, and relates to lithium ion. The preparation method comprises the following steps of: mixing a lithium source compound, an iron source compound and a phosphorus source compound according to stoichiometric proportion by a watering wet method according to 70%-85% of solid content, adding a metal-ion-doped oxide, a primary carbon source and a dispersant agent, uniformly mixing, and carrying out spray granulation after a ball mill treatment, thus obtaining a dry powder body; pretreating the dry powder body in an inert atmosphere, adding water according to 70%-85% of solid content after cooling the dry powder body, meanwhile, adding a secondary carbon source and the dispersant agent, and uniformly stirring, thus obtaining the dry powder body through the ball mill treatment and the spray granulation; and carrying out the first heat treatment on the dry powder body in the inert atmosphere, and carrying out high temperature treatment and air flow classification, thus obtaining the high-vibration-compaction low-specific-surface-area lithium iron phosphate made by a positive pole material. The processing property of the positive pole material of lithium iron phosphate is obviously improved without influencing other electrochemistry properties.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material, in particular to a preparation method for a high-tap low specific surface area positive electrode material lithium iron phosphate. Background technique [0002] Orthorhombic olivine-type lithium iron phosphate has gradually become the most potential lithium-ion power battery material due to its good safety performance, excellent cycle performance and environmental friendliness, as well as abundant raw materials and high specific capacity. wide attention from the world and industry. The application of large-scale lithium-ion batteries Cathode material is the core and key of lithium-ion battery technology, and LiFePO 4 Because of its outstanding safety performance, low price, environmental protection, and superior cycle performance, it has become the most promising lithium-ion cathode material at present. American Valence company started LiFePO in 2003 4 Industrialization, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 王耀南张文新章明陈惠明
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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