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Preparation method of lithium iron phosphate material

A lithium iron phosphate, phosphate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as affecting the conductivity of positive active materials and uneven dispersion of conductive agents, achieving excellent solubility and easy removal. , The effect of high current discharge performance improvement

Inactive Publication Date: 2012-07-11
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using the solid-phase method, it is difficult to mix various solid components fully, so the various components in the obtained lithium iron phosphate positive electrode active material, especially the conductive agent, are not uniformly dispersed, which directly affects the conductivity of the positive electrode active material.

Method used

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  • Preparation method of lithium iron phosphate material
  • Preparation method of lithium iron phosphate material
  • Preparation method of lithium iron phosphate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Use an analytical balance to accurately weigh (NH 4 ) 3 PO 4 149g, Fe(NO 3 ) 2 180g of LiF and 25g of LiF were respectively dissolved in 500ml of isophorone solvent, fully dissolved and mixed by magnetic stirring. After stirring for about 15 minutes, the drug was completely dissolved without visible crystal particles. At this point, under the action of a mechanical stirring paddle (rotating speed = 300 rpm), pour the three prepared solutions into the reaction vessel in turn while stirring; adjust the pH value of the solution to 6.5 with ammonia water and nitric acid. Heating was carried out with an oil bath, the reaction temperature was maintained at 150° C., and the reaction time was 3 h. While heating, the reaction vessel is airtight and nitrogen is passed through to protect the atmosphere, the nitrogen outlet maintains a partial pressure of 0.05Mpa, and 3% of ascorbic acid is added to inhibit oxidation. Stir with a mechanical stirrer (rotating speed = 300 rpm) ...

Embodiment 2

[0045] Use an analytical balance to accurately weigh (NH 4 ) 3 PO 4 14.9g, Fe(NO 3 ) 2 18g of LiF and 2.5g of LiF were respectively dissolved in 50ml of isophorone solvent, fully dissolved and mixed by magnetic stirring. After stirring for about 15 minutes, the drug was completely dissolved without visible crystal particles. At this point, under the action of a mechanical stirring paddle (rotating speed = 200 rpm), pour the three prepared solutions into the reaction vessel in turn while stirring; adjust the pH value of the solution to 8.6 with ammonia water and nitric acid. Heating was carried out by an oil bath, the reaction temperature was maintained at 140° C., and the reaction time was 4 hours. While heating, the reaction vessel is airtight and nitrogen is passed through to protect the atmosphere, the nitrogen outlet maintains a partial pressure of 0.05Mpa, and 3% of ascorbic acid is added to inhibit oxidation. Stir with a mechanical stirrer (speed = 350 rpm) to make...

Embodiment 3

[0050] Use an analytical balance to accurately weigh (NH 4 ) 3 PO 4 1490g, Fe(NO 3 ) 2 1800g of LiF and 250g of LiF were respectively dissolved in 5000ml of isophorone solvent, fully dissolved and mixed by magnetic stirring. After stirring for about 15 minutes, the drug was completely dissolved without visible crystal particles. At this time, under the action of a mechanical stirring paddle (rotating speed = 350 rpm), pour the three prepared solutions into the reaction vessel in turn while stirring; adjust the pH value of the solution to 7.5 with ammonia water and nitric acid. Heating was carried out with an oil bath, the reaction temperature was maintained at 150° C., and the reaction time was 5 h. While heating, the reaction vessel is airtight and nitrogen is passed through to protect the atmosphere, the nitrogen outlet maintains a partial pressure of 0.05Mpa, and 3% of ascorbic acid is added to inhibit oxidation. Stir with a mechanical stirrer (rotating speed = 300 rp...

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Abstract

The invention discloses a processing method for synthesizing lithium iron phosphate materials. The method comprises the following steps: (1), preparing nanometer lithium iron phosphate primary particles to obtain nanometer precursor particles LFP of a lithium iron phosphate precursor; (2), drying and carbon coating, and sufficiently grinding and stirring the precursor and carbon soot evenly; and (3) sintering lithium iron phosphate to obtain lithium iron phosphate cathode material. According to the invention, the nanometer primary particles can be obtained by using a coprecipitation method, isophoron is used as abstersion which has the advantages of high boiling point and strong dissolubility, reaction temperature in wet synthesis can be increased greatly, and the purity of LFP products can be improved. The synthetic method has the advantages that raw materials are rich, the price is low, the synthesis process is simple, easy, safe and reliable, the production cost is low, the yield is high, environment pollutions are avoided, and the products have better electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, and in particular relates to a preparation method of lithium iron phosphate material. Background technique [0002] Since the late 1990s, olivine-type LiFePO 4 The study of cathode materials has attracted the attention of many researchers. Lithium iron phosphate has high theoretical capacity (170mAh / g), high working voltage (voltage platform around 3.5V), appropriate mass density (3.64g / cm 3 ), small self-discharge, LiFePO at low current density 4 Li in + Almost 100% intercalation / deintercalation, long cycle life, good cycle performance, no memory effect, low price, good thermal stability, and environmental friendliness are expected to become a new generation of lithium-ion battery cathode materials. [0003] Lithium-ion batteries are widely used in various electronic devices, such as notebook computers, mobile batteries, digital cameras, portable lighting equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
Inventor 刘石磊
Owner IRICO
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