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Preparation method of doped modified ferric phosphate lithium

A lithium iron phosphate modification technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., to achieve obvious effect of doping modification and uniform distribution

Inactive Publication Date: 2007-12-05
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing doped modified lithium iron phosphate by co-precipitation method. The present invention omits the complicated process of washing impurity elements by selecting the raw material system and intermediate preparation steps, and avoids the The traditional co-precipitation method has the disadvantage of producing harmful impurities in the precursor, and at the same time, promotes the reaction between raw materials

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  • Preparation method of doped modified ferric phosphate lithium
  • Preparation method of doped modified ferric phosphate lithium
  • Preparation method of doped modified ferric phosphate lithium

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Embodiment 1

[0016] Add 150ml of deionized water and 5.2ml of 85% phosphoric acid (0.1mol) into the reaction kettle, put it on the electric heating mantle and heat it to 80°C, add 1.5g of copper oxide powder, and dissolve the copper oxide under electric stirring. Then add 5.6g of reduced iron powder, and add 10 agate beads with a diameter of 3mm, insert a reflux tube, and react under a nitrogen atmosphere, and control the reaction process through the pH value. When the pH value reaches 3.5, weigh 4.196 g of lithium hydroxide and dissolve it in 150 ml of deionized water. Slowly add it dropwise into the reaction kettle, continue the reaction, and stop the reaction after monitoring the pH value to 6.8. The precursor was obtained after the reaction product was spray-dried. The precursor was calcined at 750 °C for 12 hours under a nitrogen atmosphere, and then the doped modified LiFePO was obtained after natural cooling. 4 .

[0017] The traditional solid-phase synthesis technology is diffic...

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Abstract

The present invention discloses doped and modified lithium iron phosphate LiFePO4 preparing process, which includes the following steps: heating certain amount of deionized water and phosphoric acid to 60-90 deg.c in some reaction container, adding and dissolving cupric oxide powder, adding iron powder while stirring to react until reach pH 3-4, dropping lithium hydroxide solution slowly for complete reaction until reach pH 6.5-7, spray drying the resultant to obtain the precursor, and roasting at 700-800 deg.c to obtain doped and modified LiFePO4, with the whole process being completed under the protection of nitrogen. The present invention is one precipitating synthesis process capable of obtain LiFePO4 with small size, high purity and no hetero phase. Adding cupric oxide powder results in obvious doping effect and homogeneous doping ion distribution.

Description

technical field [0001] The invention relates to a phosphoric acid compound containing two kinds of metals, and more specifically relates to a preparation method of doped modified lithium iron phosphate which can be used as a positive electrode material of a lithium ion battery. Background technique [0002] LiFePO 4 It has the advantages of no pollution, high theoretical capacity, good voltage platform, excellent cycle stability and thermal stability, and low price. It is one of the positive electrode materials with great potential and has broad application prospects and a large market. need. LiFePO 4 The synthetic methods of the present invention mainly include: (1) solid-phase synthesis method, (2) chemical intercalation lithium method, (3) hydrothermal synthesis method, (4) sol-gel method etc. However, the coprecipitation method widely used in the synthesis of functional materials, in LiFePO 4 However, there are few reports in the synthesis of LiFePO 4 , but the resu...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 张俊喜徐娜周国定
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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