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Preparation method of LiFePO4 lithium ion battery powder

A lithium-ion battery, PO4 technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of long synthesis cycle, large drying shrinkage, etc., achieve short reaction time, complete particles, and improve electrical properties.

Inactive Publication Date: 2012-03-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to synthesize LiFePO with higher specific capacity at lower temperature. 4 , but the drying shrinkage is large, the synthesis cycle is long, and the industrialization method is difficult

Method used

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  • Preparation method of LiFePO4 lithium ion battery powder
  • Preparation method of LiFePO4 lithium ion battery powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Analytical pure LiOH·H 2 O and NH 4 h 2 PO 4 with FeC 2 o 4 2H 2 O according to Li:PO 4 : Fe = 3: 1: 1 molar ratio is added to deionized water, and after sealing, it is placed on a constant temperature heating magnetic stirrer and stirred to prepare Fe 2+ Solution A with a concentration of 0.2mol / L;

[0018] 2) Press LiOH·H 2 O and FeC 2 o 4 2H 2 The mass ratio of O mass sum and citric acid is 1: 0.5 in solution A, add analytically pure citric acid (C 6 h 8 o 7 ·H 2 (0), magnetic stirring under normal temperature evenly obtains solution B;

[0019] 3) Add activated carbon to solution B at a molar ratio of Fe:C=1:4, and stir magnetically at room temperature to obtain solution C;

[0020] 4) adjusting the pH value of solution C to 8.0 to obtain a reaction solution;

[0021] 5) Pour the reaction solution into an ultrasonic hydrothermal kettle, seal the hydrothermal kettle, and put it into a temperature-pressure dual-control ultrasonic hydrothermal react...

Embodiment 2

[0024] 1) separate analytically pure Li 2 CO 3 and NH 4 h 2 PO 4 with FeC 2 o 4 2H 2 O according to Li:PO 4 : Fe = 1: 3: 0.5 molar ratio is added to deionized water, sealed and placed on a constant temperature heating magnetic stirrer to stir to prepare Fe 2+ Solution A with a concentration of 0.1mol / L;

[0025] 2) Press Li 2 CO 3 and FeC 2 o 4 2H 2 The sum of O mass and citric acid are 1: 1.5 mass ratios in solution A, add analytically pure citric acid (C 6 h 8 o 7 ·H 2 (0), magnetic stirring under normal temperature evenly obtains solution B;

[0026] 3) Add activated carbon to solution B at a molar ratio of Fe:C=1:5, and stir magnetically at room temperature to obtain solution C;

[0027] 4) adjusting the pH value of solution C to 3.0 to obtain a reaction solution;

[0028] 5) Pour the reaction solution into an ultrasonic hydrothermal kettle, seal the hydrothermal kettle, and put it into a temperature-pressure dual-control ultrasonic hydrothermal reactor ...

Embodiment 3

[0031] 1) Analytical pure LiOH·H 2 O and NH 4 h 2 PO 4 with FeC 2 o 4 2H 2 O according to Li:PO 4 : The molar ratio of Fe=0.5:12:2 is added into deionized water, sealed and placed on a constant temperature heating magnetic stirrer to stir and prepare Fe 2+ Solution A with a concentration of 0.5mol / L;

[0032] 2) Press LiOH·H 2 O and FeC 2 o 4 2H 2 The sum of O mass and citric acid is 1: 2 solution B;

[0033] 3) Add activated carbon to solution B at a molar ratio of Fe:C=1:1, and stir magnetically at room temperature to obtain solution C;

[0034] 4) adjusting the pH value of solution C to 5.0 to obtain a reaction solution;

[0035] 5) Pour the reaction solution into an ultrasonic hydrothermal kettle, seal the hydrothermal kettle, and put it into a temperature-pressure dual-control ultrasonic hydrothermal reactor for reaction. The hydrothermal temperature is controlled at 220°C, the pressure is controlled at 5.0MPa, and the ultrasonic power Control at 1000w, reac...

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Abstract

The invention discloses a preparation method of LiFePO4 lithium ion battery powder, which comprises the steps of: dissolving LiOH.H2O or Li2CO3 and NH4H2PO4 and FeC2O4.2H2O in deionized water to obtain a solution A; adding citric acid in the solution A to obtain a solution B; adding active carbon in the solution B to obtain a solution C; regulating the pH of the solution C to reach 3.0-11.0 to obtain a reaction solution; and pouring the reaction solution into an ultrasonic hydrothermal reactor, sealing the hydrothermal reactor, placing the sealed hydrothermal reactor in a temperature and pressure dual-control ultrasonic hydrothermal reactor for reacting, after the reaction is ended, naturally cooling to reach the room temperature, centrifugally separating and then cleaning with deionized water and absolute ethyl alcohol respectively, and then placing in a vacuum drying box for drying to obtain the LiFePO4 lithium ion battery powder. The preparation method can be completed once in a liquid phase without later stage annealing thermal treatment, and has the advantages of low reaction temperature, short reaction period, small energy consumption and capability of reduction of the preparation cost of the powder; and the prepared powder has the advantages of good stability, simpleness in operation and good repeatability, and is suitable for massive production.

Description

technical field [0001] The invention relates to a preparation method of lithium-ion battery powder, in particular to a method for preparing nano-LiFePO by ultrasonic hydrothermal 4 Lithium-ion battery powder method. Background technique [0002] Lithium-ion batteries refer to the use of carbon materials that can absorb or desorb lithium ions as the negative electrode active material; use metal oxides that can absorb or desorb lithium ions and contain lithium ions as the positive electrode active material, based on the above chemical reaction principle. A rechargeable battery using an organic solvent as the electrolyte. According to different cathode materials, lithium batteries mainly include lithium cobaltate, lithium manganate, ternary materials and lithium iron phosphate. In comparison, the biggest problems of lithium cobalt oxide with a two-dimensional layered structure are poor safety (explosion at high temperature of 150 degrees), high cost, and short cycle life; lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
Inventor 黄剑锋孙莹李意峰曹丽云
Owner SHAANXI UNIV OF SCI & TECH
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