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A kind of preparation method of highly conductive lithium iron phosphate cathode material

A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of difficult process control and difficult mixing uniformly, and achieve low energy consumption, good particle size uniformity, The effect of low reaction temperature

Inactive Publication Date: 2017-02-15
向勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the precursor is separated and dried, it is mixed with metal ion salt, which is solid phase and solid phase mixing. The method used is ball milling, which is difficult to mix evenly
The final reaction needs to be carried out under an inert atmosphere, and the process control is difficult

Method used

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  • A kind of preparation method of highly conductive lithium iron phosphate cathode material
  • A kind of preparation method of highly conductive lithium iron phosphate cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh 1 mol of lithium hydroxide (LiOH) and 0.975 mol of iron citrate (FeC 6 h 5 o 7 ), 1mol of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), 0.0083mol of zinc citrate (Zn 3 (C 6 h 5 o 7 ) 2 2H 2 O) and 2mol citric acid (C 6 h 8 o 7 ).

[0022] (2) First add 0.975mol of ferric citrate (FeC 6 h 5 o 7 ), 0.0083mol of zinc citrate (Zn 3 (C 6 h 5 o 7 ) 2 2H 2 O) and 2mol citric acid were completely dissolved in a sufficient amount of deionized water (about 2L), and the dissolution temperature was controlled at 60°C. At the same time, 1 mol of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 1mol lithium hydroxide (LiOH) are completely dissolved in a sufficient amount of deionized water (about 4L) to obtain LiH 2 PO 4 solution.

[0023] (3) After complete dissolution, mix the two solutions, stir with a magnetic stirrer to mix evenly, pour the mixed solution into a high-pressure reactor, and heat at a constant temperature of 180°C for 6h. ...

Embodiment 2

[0026] (1) Weigh 1 mol of lithium hydroxide (LiOH) and 0.95 mol of iron citrate (FeC 6 h 5 o 7 ), 1mol of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), 0.0167mol of zinc citrate (Zn 3 (C 6 h 5 o 7 ) 2 2H 2 O) and 2mol citric acid (C 6 h 8 o 7 ).

[0027] (2) First add 0.95mol of ferric citrate (FeC 6 h 5 o 7 ), 0.0167mol of zinc citrate (Zn 3 (C 6 h 5 o7 ) 2 2H 2 O) and 2mol citric acid were completely dissolved in a sufficient amount of deionized water, and the dissolution temperature was controlled at 60°C. At the same time, 1 mol of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 1mol lithium hydroxide (LiOH) are completely dissolved in a sufficient amount of deionized water to obtain LiH 2 PO 4 solution.

[0028] (3) After complete dissolution, mix the two solutions, stir with a magnetic stirrer to mix evenly, pour the mixed solution into a high-pressure reactor, and heat at a constant temperature of 190°C for 7 hours.

[0029] (4) After th...

Embodiment 3

[0031] (1) Weigh 1 mol of lithium hydroxide (LiOH) and 0.9 mol of iron citrate (FeC 6 h 5 o 7 ), 1mol of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), 0.034mol of zinc citrate (Zn 3 (C 6 h 5 o 7 ) 2 2H 2 O) and 2mol citric acid (C 6 h 8 o 7 ).

[0032] (2) First add 0.9mol of ferric citrate (FeC 6 h 5 o 7 ), 0.034mol of zinc citrate (Zn3(C 6 h 5 o 7 ) 2 2H 2 O) and 2mol citric acid are completely dissolved in a sufficient amount of deionized water, and the dissolution temperature is controlled at 70°C. At the same time, 1 mol of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 1mol lithium hydroxide (LiOH) are completely dissolved in a sufficient amount of deionized water to obtain LiH 2 PO 4 solution.

[0033] (3) Mix the two solutions after complete dissolution, stir with a magnetic stirrer to mix evenly, pour the mixed solution into a high-pressure reactor, and heat at a constant temperature of 200°C for 8 hours.

[0034] (4) After the reacti...

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Abstract

The invention relates to a preparation method of a high-conductivity lithium ferrous phosphate positive electrode material. Ferric citrate, zinc citrate and citric acid are completely dissolved in deionized water, and the dissolution temperature is controlled at 50-70°C. At the same time, dihydrogen phosphate Ammonium and lithium hydroxide are completely dissolved in deionized water to obtain a LiH2PO4 solution, mixed evenly, poured into a high-pressure reactor, and heated at a constant temperature of 180-200 ° C for 6-8 hours. According to the invention, the lithium ferrous phosphate (LiFePO4) is synthesized by the hydrothermal method, and the synthesized lithium ferrous phosphate (LiFePO4) has the advantages of small particle size and good particle size uniformity. Low reaction temperature and low energy consumption.

Description

technical field [0001] The invention relates to a preparation method of a high-conductivity lithium iron phosphate positive electrode material, in particular to a method for preparing lithium iron phosphate (LiFePO 4 ) doping modification method, which belongs to the technical field of lithium ion batteries. Background technique [0002] Since lithium iron phosphate (LiFePO 4 ) has a wide range of sources of raw materials, relatively low price (about 1 / 5 of lithium cobalt oxide), environmental friendliness, outstanding safety performance, and high theoretical specific capacity (about 170mAh / g), making it suitable for various mobile power sources, especially It is the large-scale power supply field required by the automobile industry and has a great market prospect. However, the main problem of lithium iron phosphate is its low electronic conductivity and slow diffusion of lithium ions. There are currently reports in the literature to improve this problem by coating carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01B25/45H01M4/5825Y02E60/10
Inventor 向勇宋世湃张庶臧亮张晓琨
Owner 向勇