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Reduction processing method for synthesizing lithium iron phosphate materials

A technology of lithium iron phosphate and process method, which is applied in the field of reduction process of synthetic lithium iron phosphate material, and can solve the problems affecting the conductivity of positive electrode active material and uneven dispersion of conductive agent

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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  • Reduction processing method for synthesizing lithium iron phosphate materials
  • Reduction processing method for synthesizing lithium iron phosphate materials
  • Reduction processing method for synthesizing lithium iron phosphate materials

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Use an analytical balance to accurately weigh (NH 4 ) 3 PO 4 149g, FeCl 2 91.5g of LiF and 25g of LiF were respectively dissolved in 500ml of water and fully dissolved 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=300 rpm), three prepared solutions are poured into the reaction vessel successively while stirring, and the pH value of the solution is adjusted to 6.5 with ammonia water and nitric acid, and finally 1000ml of Ethylene glycol (high boiling point organic solvent). Keep heating at 110° C. for 3 h, and stir with a mechanical stirrer (speed = 300 rpm). While heating, the reaction vessel was fed with nitrogen as an inert gas protection, and 3% sulfurous acid was added as an antioxidant. After the reaction is completed, the mixed material liquid is filtered, and the precipitation is repeatedly washed a...

Embodiment 2

[0051] Use an analytical balance to accurately weigh (NH 4 ) 3 PO 4 1490g, FeCl 2 915g of LiF and 250g of LiF were respectively dissolved in 5000ml of water and fully dissolved 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=400 rpm), pour the three prepared solutions into the reaction vessel successively while stirring, adjust the pH value of the solution to 7.5 with ammonia and nitric acid, and finally add 10000ml of Ethylene glycol (high boiling point organic solvent). Keep heating at 120° C. for 4 h, and stir with a mechanical stirrer (speed = 400 rpm). While heating, the reaction vessel was fed with nitrogen as an inert gas protection, and 4% sulfurous acid was added as an antioxidant simultaneously. After the reaction is completed, the mixed material liquid is filtered, and the precipitate is repeatedly washe...

Embodiment 3

[0057] Use an analytical balance to accurately weigh (NH 4 ) 3 PO 4 14.9g, FeCl 2 9.15g of LiF and 2.5g of LiF were respectively dissolved in 50ml of water and fully dissolved 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=300 rpm), pour the three prepared solutions into the reaction vessel successively while stirring, adjust the pH value of the solution to 8.6 with ammonia and nitric acid, and finally add 100ml of ethyl alcohol. Glycols (high boiling point organic solvents). Keep heating at 120° C. for 3 h, and stir with a mechanical stirrer (speed = 300 rpm). While heating, the reaction vessel was fed with nitrogen as an inert gas protection, and 3% sulfurous acid was added as an antioxidant. After the reaction is completed, the mixed material liquid is filtered, and the precipitate is repeatedly washed and filt...

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Abstract

The invention discloses a reduction processing method for synthesizing lithium iron phosphate materials, which 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 cathode materials for lithium ion batteries, and in particular relates to a reduction process method for synthesizing lithium iron phosphate materials. 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 camera...

Claims

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Application Information

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IPC IPC(8): C01B25/45
Inventor 刘石磊
Owner IRICO
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