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Method for preparing anode material lithium iron phosphate

A technology of lithium iron phosphate and positive electrode materials, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as unfavorable industrial production, and achieve excellent electrical conductivity, small particle size distribution, and good safety performance.

Active Publication Date: 2009-12-09
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using this method, the whole process must be carried out in a nitrogen protective atmosphere, which is not conducive to the implementation of industrial production

Method used

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  • Method for preparing anode material lithium iron phosphate
  • Method for preparing anode material lithium iron phosphate
  • Method for preparing anode material lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] figure 1 It is a flow chart of an embodiment of the preparation method of the positive electrode material lithium iron phosphate of the present invention. As shown in the figure, the preparation method of this embodiment includes the following steps:

[0044] S101, weighing raw materials;

[0045] Weigh 40,000g of lithium dihydrogen phosphate, 1,571g of magnesium hydroxide, an ionic compound with good conductivity, 28,580g of nanoscale iron oxide, and the specific surface area is 500-900m 21578g ultra-fine carbon powder between / g and the specific surface area is 40-100m 2 3682g of superfine carbon powder between / g;

[0046] figure 2 This is the scanning electron micrograph of the nano-scale iron oxide prepared by chemical method used in this example. It can be seen from the figure that the nano-scale iron oxide particles are spherical, and the particle size is less than 100 nanometers.

[0047] S102, raw material ball milling;

[0048] Add 500-800kg of 5-10mm zi...

Embodiment 2

[0066] In this example, 40,000 g of lithium dihydrogen phosphate, 2,245 g of magnesium hydroxide, an ionic compound with good conductivity, and 27,660 g of iron oxide, with a specific surface area of ​​500 to 900 m 2 1578g ultra-fine carbon powder between / g and the specific surface area is 40-100m 2 3682g of superfine carbon powder between / g. The specific production process is the same as that of the first embodiment above, and the obtained results are also basically the same.

Embodiment 3

[0068] In this example, 40,000g of lithium dihydrogen phosphate, 449g of magnesium hydroxide, an ionic compound with good conductivity, and 30,120g of iron oxide, with a specific surface area of ​​500 to 900m 2 1578g ultra-fine carbon powder between / g and the specific surface area is 40-100m 2 3682g of superfine carbon powder between / g. The specific production process is the same as that of the first embodiment above, and the obtained results are also basically the same.

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Abstract

The invention relates to a method for preparing an anode material lithium iron phosphate. The method comprises the following steps: S1, weighing raw materials, including lithium dihydrogen phosphate and ferric oxide arranged according to a precontrolled molar ratio of Fe, Li and PO4, a conductive ionic compound and ultrafine graphitized carbon black; S2, carrying out ball milling, spray drying, mixing and pelletizing on the raw materials in sequence to obtain a block material; S3, loading the block material into a ceramic crucible, and placing the crucible into a sintering furnace using non-oxidizing gas as a medium for sintering; and S4, carrying out crush fining, screening and dry packaging on the sintered block material in sequence to obtain a finished product lithium iron phosphate. The method can obtain lithium iron phosphate powder with non impurity phase, single structure and small particle diameter distribution, can obviously reduce cost for manufacturing the lithium iron phosphate, and has light pollution; meanwhile, the lithium iron phosphate powder has the characteristics of high gram volume, excellent electric conductivity and good safety performance.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing a cathode material, lithium iron phosphate. Background technique [0002] With the increase of car ownership, the problem of car pollution is becoming more and more serious. According to OICA statistics, vehicle exhaust emissions have accounted for the global CO2 2 15.9% of total emissions. If vehicle exhaust emissions cannot be effectively controlled, this figure may continue to grow. In addition, with the development of the world economy, international oil prices have fluctuated violently in recent years, coupled with the expected reduction in future oil resources, oil has become a bottleneck for the development of the world economy. Due to the long-term needs of protecting the environment and reducing the consumption of petroleum resources, new energy vehicles have become a new development direction of the automotive industry. According to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
CPCY02E60/12Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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